merge: Migrate to flow-based simulation for low-level models

This pull request converts the `opendc-simulator-resources` module into a flow
simulator and adapts the existing low-level models (e.g., CPU, network, disk)
to this new flow simulator.

The flow simulator works differently from the uniform resource consumption
model, in that it models flow through a system of connections, as opposed to
resource consumptions. Concretely, this means that while in the uniform
resource consumption model, consumptions with the same usage are propagated to
the resources, in the flow simulator, only changes to the flow in the system
are propagated. 

Overall, this leads to less updates in the system and therefore higher
performance. The benchmarks shows that the new implementation obtains more than
double the performance of the old implementation. We have focused in the new
implementation on reducing the amount of work and memory
allocations/loads/stores per updates.

* Migrate from kotlinx-benchmark to jmh-gradle (for better profiling support)
* Use longer traces for benchmarks (to prevent measuring the benchmark
overhead)
* Use direct field access for perf-sensitive code
* Combine work and deadline to duration
* Add support for pushing flow from context (to eliminate the allocation for
every `SimResourceCommand`)
* Reduce memory allocations in SimResourceInterpreter, by revamping the way
timers are allocated.
* Simplify max-min aggregator implementation (by utilizing the new push
mechanism) 
* Invoke consumer callback on every invalidation (in order to propagate changes
downstream)
* Lazily push changes to resource context (by not updating the flow rate
immediately after a push, but only after an update)
* Remove onUpdate callback 
* Merge distributor and aggregator into switch 
* Separate push and pull flags 
* Remove failure callback from FlowSource 
* Create separate callbacks for remaining events 
* Make convergence callback optional
* Reduce field accesses in FlowConsumerContextImpl
* Optimize hot path in SimTraceWorkload
* Expose CPU time counters directly on hypervisor 
* Optimize telemetry collection

**Breaking API Changes**

* The entire `opendc-simulator-resources` module has been replaced by the
`opendc-simulator-flow` module.
* `SimHypervisor.Listener` has been removed in favour of a new interface that
exposes the performance counters of the hypervisor directly. To listen for
convergence, use `FlowConvergenceListener`.

8 files changed, 0 insertions, 1313 deletions

diff --git a/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceAggregatorMaxMinTest.kt b/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceAggregatorMaxMinTest.kt
deleted file mode 100644
index 2f01a8c4..00000000
--- a/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceAggregatorMaxMinTest.kt
+++ /dev/null
@@ -1,200 +0,0 @@
-/*
- * Copyright (c) 2021 AtLarge Research
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package org.opendc.simulator.resources
-
-import io.mockk.every
-import io.mockk.mockk
-import io.mockk.verify
-import kotlinx.coroutines.*
-import org.junit.jupiter.api.Assertions.*
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.assertAll
-import org.junit.jupiter.api.assertThrows
-import org.opendc.simulator.core.runBlockingSimulation
-import org.opendc.simulator.resources.consumer.SimSpeedConsumerAdapter
-import org.opendc.simulator.resources.consumer.SimWorkConsumer
-import org.opendc.simulator.resources.impl.SimResourceInterpreterImpl
-
-/**
- * Test suite for the [SimResourceAggregatorMaxMin] class.
- */
-@OptIn(ExperimentalCoroutinesApi::class)
-internal class SimResourceAggregatorMaxMinTest {
-    @Test
-    fun testSingleCapacity() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-
-        val aggregator = SimResourceAggregatorMaxMin(scheduler)
-        val forwarder = SimResourceForwarder()
-        val sources = listOf(
-            forwarder,
-            SimResourceSource(1.0, scheduler)
-        )
-        sources.forEach(aggregator::addInput)
-
-        val consumer = SimWorkConsumer(1.0, 0.5)
-        val usage = mutableListOf<Double>()
-        val source = SimResourceSource(1.0, scheduler)
-        val adapter = SimSpeedConsumerAdapter(forwarder, usage::add)
-        source.startConsumer(adapter)
-
-        aggregator.consume(consumer)
-        yield()
-
-        assertAll(
-            { assertEquals(1000, clock.millis()) },
-            { assertEquals(listOf(0.0, 0.5, 0.0), usage) }
-        )
-    }
-
-    @Test
-    fun testDoubleCapacity() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-
-        val aggregator = SimResourceAggregatorMaxMin(scheduler)
-        val sources = listOf(
-            SimResourceSource(1.0, scheduler),
-            SimResourceSource(1.0, scheduler)
-        )
-        sources.forEach(aggregator::addInput)
-
-        val consumer = SimWorkConsumer(2.0, 1.0)
-        val usage = mutableListOf<Double>()
-        val adapter = SimSpeedConsumerAdapter(consumer, usage::add)
-
-        aggregator.consume(adapter)
-        yield()
-        assertAll(
-            { assertEquals(1000, clock.millis()) },
-            { assertEquals(listOf(0.0, 2.0, 0.0), usage) }
-        )
-    }
-
-    @Test
-    fun testOvercommit() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-
-        val aggregator = SimResourceAggregatorMaxMin(scheduler)
-        val sources = listOf(
-            SimResourceSource(1.0, scheduler),
-            SimResourceSource(1.0, scheduler)
-        )
-        sources.forEach(aggregator::addInput)
-
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) }
-            .returns(SimResourceCommand.Consume(4.0, 4.0, 1000))
-            .andThen(SimResourceCommand.Exit)
-
-        aggregator.consume(consumer)
-        yield()
-        assertEquals(1000, clock.millis())
-
-        verify(exactly = 2) { consumer.onNext(any()) }
-    }
-
-    @Test
-    fun testException() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-
-        val aggregator = SimResourceAggregatorMaxMin(scheduler)
-        val sources = listOf(
-            SimResourceSource(1.0, scheduler),
-            SimResourceSource(1.0, scheduler)
-        )
-        sources.forEach(aggregator::addInput)
-
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) }
-            .returns(SimResourceCommand.Consume(1.0, 1.0))
-            .andThenThrows(IllegalStateException("Test Exception"))
-
-        assertThrows<IllegalStateException> { aggregator.consume(consumer) }
-        yield()
-        assertFalse(sources[0].isActive)
-    }
-
-    @Test
-    fun testAdjustCapacity() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-
-        val aggregator = SimResourceAggregatorMaxMin(scheduler)
-        val sources = listOf(
-            SimResourceSource(1.0, scheduler),
-            SimResourceSource(1.0, scheduler)
-        )
-        sources.forEach(aggregator::addInput)
-
-        val consumer = SimWorkConsumer(4.0, 1.0)
-        coroutineScope {
-            launch { aggregator.consume(consumer) }
-            delay(1000)
-            sources[0].capacity = 0.5
-        }
-        yield()
-        assertEquals(2334, clock.millis())
-    }
-
-    @Test
-    fun testFailOverCapacity() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-
-        val aggregator = SimResourceAggregatorMaxMin(scheduler)
-        val sources = listOf(
-            SimResourceSource(1.0, scheduler),
-            SimResourceSource(1.0, scheduler)
-        )
-        sources.forEach(aggregator::addInput)
-
-        val consumer = SimWorkConsumer(1.0, 0.5)
-        coroutineScope {
-            launch { aggregator.consume(consumer) }
-            delay(500)
-            sources[0].capacity = 0.5
-        }
-        yield()
-        assertEquals(1000, clock.millis())
-    }
-
-    @Test
-    fun testCounters() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-
-        val aggregator = SimResourceAggregatorMaxMin(scheduler)
-        val sources = listOf(
-            SimResourceSource(1.0, scheduler),
-            SimResourceSource(1.0, scheduler)
-        )
-        sources.forEach(aggregator::addInput)
-
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) }
-            .returns(SimResourceCommand.Consume(4.0, 4.0, 1000))
-            .andThen(SimResourceCommand.Exit)
-
-        aggregator.consume(consumer)
-        yield()
-        assertEquals(1000, clock.millis())
-        assertEquals(2.0, aggregator.counters.actual) { "Actual work mismatch" }
-    }
-}
diff --git a/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceCommandTest.kt b/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceCommandTest.kt
deleted file mode 100644
index 02d456ff..00000000
--- a/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceCommandTest.kt
+++ /dev/null
@@ -1,74 +0,0 @@
-/*
- * Copyright (c) 2021 AtLarge Research
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package org.opendc.simulator.resources
-
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.assertDoesNotThrow
-import org.junit.jupiter.api.assertThrows
-
-/**
- * Test suite for [SimResourceCommand].
- */
-class SimResourceCommandTest {
-    @Test
-    fun testZeroWork() {
-        assertThrows<IllegalArgumentException> {
-            SimResourceCommand.Consume(0.0, 1.0)
-        }
-    }
-
-    @Test
-    fun testNegativeWork() {
-        assertThrows<IllegalArgumentException> {
-            SimResourceCommand.Consume(-1.0, 1.0)
-        }
-    }
-
-    @Test
-    fun testZeroLimit() {
-        assertThrows<IllegalArgumentException> {
-            SimResourceCommand.Consume(1.0, 0.0)
-        }
-    }
-
-    @Test
-    fun testNegativeLimit() {
-        assertThrows<IllegalArgumentException> {
-            SimResourceCommand.Consume(1.0, -1.0, 1)
-        }
-    }
-
-    @Test
-    fun testConsumeCorrect() {
-        assertDoesNotThrow {
-            SimResourceCommand.Consume(1.0, 1.0)
-        }
-    }
-
-    @Test
-    fun testIdleCorrect() {
-        assertDoesNotThrow {
-            SimResourceCommand.Idle(1)
-        }
-    }
-}
diff --git a/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceContextTest.kt b/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceContextTest.kt
deleted file mode 100644
index 6cb507ce..00000000
--- a/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceContextTest.kt
+++ /dev/null
@@ -1,160 +0,0 @@
-/*
- * Copyright (c) 2021 AtLarge Research
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package org.opendc.simulator.resources
-
-import io.mockk.*
-import kotlinx.coroutines.*
-import org.junit.jupiter.api.*
-import org.opendc.simulator.core.runBlockingSimulation
-import org.opendc.simulator.resources.impl.SimResourceContextImpl
-import org.opendc.simulator.resources.impl.SimResourceInterpreterImpl
-
-/**
- * A test suite for the [SimResourceContextImpl] class.
- */
-@OptIn(ExperimentalCoroutinesApi::class)
-class SimResourceContextTest {
-    @Test
-    fun testFlushWithoutCommand() = runBlockingSimulation {
-        val interpreter = SimResourceInterpreterImpl(coroutineContext, clock)
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) } returns SimResourceCommand.Consume(10.0, 1.0) andThen SimResourceCommand.Exit
-
-        val logic = object : SimResourceProviderLogic {
-            override fun onIdle(ctx: SimResourceControllableContext, deadline: Long): Long = deadline
-            override fun onConsume(ctx: SimResourceControllableContext, work: Double, limit: Double, deadline: Long): Long = deadline
-            override fun onFinish(ctx: SimResourceControllableContext) {}
-        }
-        val context = SimResourceContextImpl(null, interpreter, consumer, logic)
-
-        context.doUpdate(interpreter.clock.millis())
-    }
-
-    @Test
-    fun testIntermediateFlush() = runBlockingSimulation {
-        val interpreter = SimResourceInterpreterImpl(coroutineContext, clock)
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) } returns SimResourceCommand.Consume(10.0, 1.0) andThen SimResourceCommand.Exit
-
-        val logic = spyk(object : SimResourceProviderLogic {
-            override fun onIdle(ctx: SimResourceControllableContext, deadline: Long): Long = deadline
-            override fun onFinish(ctx: SimResourceControllableContext) {}
-            override fun onConsume(ctx: SimResourceControllableContext, work: Double, limit: Double, deadline: Long): Long = deadline
-        })
-        val context = spyk(SimResourceContextImpl(null, interpreter, consumer, logic))
-
-        context.start()
-        delay(1) // Delay 1 ms to prevent hitting the fast path
-        context.doUpdate(interpreter.clock.millis())
-
-        verify(exactly = 2) { logic.onConsume(any(), any(), any(), any()) }
-    }
-
-    @Test
-    fun testIntermediateFlushIdle() = runBlockingSimulation {
-        val interpreter = SimResourceInterpreterImpl(coroutineContext, clock)
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) } returns SimResourceCommand.Idle(10) andThen SimResourceCommand.Exit
-
-        val logic = spyk(object : SimResourceProviderLogic {
-            override fun onIdle(ctx: SimResourceControllableContext, deadline: Long): Long = deadline
-            override fun onFinish(ctx: SimResourceControllableContext) {}
-            override fun onConsume(ctx: SimResourceControllableContext, work: Double, limit: Double, deadline: Long): Long = deadline
-        })
-        val context = spyk(SimResourceContextImpl(null, interpreter, consumer, logic))
-
-        context.start()
-        delay(5)
-        context.invalidate()
-        delay(5)
-        context.invalidate()
-
-        assertAll(
-            { verify(exactly = 2) { logic.onIdle(any(), any()) } },
-            { verify(exactly = 1) { logic.onFinish(any()) } }
-        )
-    }
-
-    @Test
-    fun testDoubleStart() = runBlockingSimulation {
-        val interpreter = SimResourceInterpreterImpl(coroutineContext, clock)
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) } returns SimResourceCommand.Idle(10) andThen SimResourceCommand.Exit
-
-        val logic = object : SimResourceProviderLogic {
-            override fun onIdle(ctx: SimResourceControllableContext, deadline: Long): Long = deadline
-            override fun onFinish(ctx: SimResourceControllableContext) {}
-            override fun onConsume(ctx: SimResourceControllableContext, work: Double, limit: Double, deadline: Long): Long = deadline
-        }
-        val context = SimResourceContextImpl(null, interpreter, consumer, logic)
-
-        context.start()
-
-        assertThrows<IllegalStateException> {
-            context.start()
-        }
-    }
-
-    @Test
-    fun testIdempodentCapacityChange() = runBlockingSimulation {
-        val interpreter = SimResourceInterpreterImpl(coroutineContext, clock)
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) } returns SimResourceCommand.Consume(10.0, 1.0) andThen SimResourceCommand.Exit
-
-        val logic = object : SimResourceProviderLogic {
-            override fun onIdle(ctx: SimResourceControllableContext, deadline: Long): Long = deadline
-            override fun onFinish(ctx: SimResourceControllableContext) {}
-            override fun onConsume(ctx: SimResourceControllableContext, work: Double, limit: Double, deadline: Long): Long = deadline
-        }
-
-        val context = SimResourceContextImpl(null, interpreter, consumer, logic)
-        context.capacity = 4200.0
-        context.start()
-        context.capacity = 4200.0
-
-        verify(exactly = 0) { consumer.onEvent(any(), SimResourceEvent.Capacity) }
-    }
-
-    @Test
-    fun testFailureNoInfiniteLoop() = runBlockingSimulation {
-        val interpreter = SimResourceInterpreterImpl(coroutineContext, clock)
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) } returns SimResourceCommand.Exit
-        every { consumer.onEvent(any(), SimResourceEvent.Exit) } throws IllegalStateException("onEvent")
-        every { consumer.onFailure(any(), any()) } throws IllegalStateException("onFailure")
-
-        val logic = spyk(object : SimResourceProviderLogic {
-            override fun onIdle(ctx: SimResourceControllableContext, deadline: Long): Long = deadline
-            override fun onFinish(ctx: SimResourceControllableContext) {}
-            override fun onConsume(ctx: SimResourceControllableContext, work: Double, limit: Double, deadline: Long): Long = deadline
-        })
-
-        val context = SimResourceContextImpl(null, interpreter, consumer, logic)
-
-        context.start()
-
-        delay(1)
-
-        verify(exactly = 1) { consumer.onFailure(any(), any()) }
-    }
-}
diff --git a/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSourceTest.kt b/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSourceTest.kt
deleted file mode 100644
index 4895544d..00000000
--- a/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSourceTest.kt
+++ /dev/null
@@ -1,273 +0,0 @@
-/*
- * Copyright (c) 2021 AtLarge Research
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package org.opendc.simulator.resources
-
-import io.mockk.every
-import io.mockk.mockk
-import io.mockk.spyk
-import io.mockk.verify
-import kotlinx.coroutines.*
-import org.junit.jupiter.api.*
-import org.junit.jupiter.api.Assertions.assertEquals
-import org.opendc.simulator.core.runBlockingSimulation
-import org.opendc.simulator.resources.consumer.SimSpeedConsumerAdapter
-import org.opendc.simulator.resources.consumer.SimWorkConsumer
-import org.opendc.simulator.resources.impl.SimResourceInterpreterImpl
-
-/**
- * A test suite for the [SimResourceSource] class.
- */
-@OptIn(ExperimentalCoroutinesApi::class)
-class SimResourceSourceTest {
-    @Test
-    fun testSpeed() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val capacity = 4200.0
-        val provider = SimResourceSource(capacity, scheduler)
-
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) }
-            .returns(SimResourceCommand.Consume(1000 * capacity, capacity))
-            .andThen(SimResourceCommand.Exit)
-
-        val res = mutableListOf<Double>()
-        val adapter = SimSpeedConsumerAdapter(consumer, res::add)
-
-        provider.consume(adapter)
-
-        assertEquals(listOf(0.0, capacity, 0.0), res) { "Speed is reported correctly" }
-    }
-
-    @Test
-    fun testAdjustCapacity() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val provider = SimResourceSource(1.0, scheduler)
-
-        val consumer = spyk(SimWorkConsumer(2.0, 1.0))
-
-        coroutineScope {
-            launch { provider.consume(consumer) }
-            delay(1000)
-            provider.capacity = 0.5
-        }
-        assertEquals(3000, clock.millis())
-        verify(exactly = 1) { consumer.onEvent(any(), SimResourceEvent.Capacity) }
-    }
-
-    @Test
-    fun testSpeedLimit() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val capacity = 4200.0
-        val provider = SimResourceSource(capacity, scheduler)
-
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) }
-            .returns(SimResourceCommand.Consume(1000 * capacity, 2 * capacity))
-            .andThen(SimResourceCommand.Exit)
-
-        val res = mutableListOf<Double>()
-        val adapter = SimSpeedConsumerAdapter(consumer, res::add)
-
-        provider.consume(adapter)
-
-        assertEquals(listOf(0.0, capacity, 0.0), res) { "Speed is reported correctly" }
-    }
-
-    /**
-     * Test to see whether no infinite recursion occurs when interrupting during [SimResourceConsumer.onStart] or
-     * [SimResourceConsumer.onNext].
-     */
-    @Test
-    fun testIntermediateInterrupt() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val capacity = 4200.0
-        val provider = SimResourceSource(capacity, scheduler)
-
-        val consumer = object : SimResourceConsumer {
-            override fun onNext(ctx: SimResourceContext): SimResourceCommand {
-                return SimResourceCommand.Exit
-            }
-
-            override fun onEvent(ctx: SimResourceContext, event: SimResourceEvent) {
-                ctx.interrupt()
-            }
-        }
-
-        provider.consume(consumer)
-    }
-
-    @Test
-    fun testInterrupt() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val capacity = 4200.0
-        val provider = SimResourceSource(capacity, scheduler)
-        lateinit var resCtx: SimResourceContext
-
-        val consumer = object : SimResourceConsumer {
-            var isFirst = true
-
-            override fun onEvent(ctx: SimResourceContext, event: SimResourceEvent) {
-                when (event) {
-                    SimResourceEvent.Start -> resCtx = ctx
-                    else -> {}
-                }
-            }
-
-            override fun onNext(ctx: SimResourceContext): SimResourceCommand {
-                assertEquals(0.0, ctx.remainingWork)
-                return if (isFirst) {
-                    isFirst = false
-                    SimResourceCommand.Consume(4.0, 1.0)
-                } else {
-                    SimResourceCommand.Exit
-                }
-            }
-        }
-
-        launch {
-            yield()
-            resCtx.interrupt()
-        }
-        provider.consume(consumer)
-
-        assertEquals(0, clock.millis())
-    }
-
-    @Test
-    fun testFailure() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val capacity = 4200.0
-        val provider = SimResourceSource(capacity, scheduler)
-
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onEvent(any(), eq(SimResourceEvent.Start)) }
-            .throws(IllegalStateException())
-
-        assertThrows<IllegalStateException> {
-            provider.consume(consumer)
-        }
-    }
-
-    @Test
-    fun testExceptionPropagationOnNext() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val capacity = 4200.0
-        val provider = SimResourceSource(capacity, scheduler)
-
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) }
-            .returns(SimResourceCommand.Consume(1.0, 1.0))
-            .andThenThrows(IllegalStateException())
-
-        assertThrows<IllegalStateException> {
-            provider.consume(consumer)
-        }
-    }
-
-    @Test
-    fun testConcurrentConsumption() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val capacity = 4200.0
-        val provider = SimResourceSource(capacity, scheduler)
-
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) }
-            .returns(SimResourceCommand.Consume(1.0, 1.0))
-            .andThenThrows(IllegalStateException())
-
-        assertThrows<IllegalStateException> {
-            coroutineScope {
-                launch { provider.consume(consumer) }
-                provider.consume(consumer)
-            }
-        }
-    }
-
-    @Test
-    fun testCancelDuringConsumption() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val capacity = 4200.0
-        val provider = SimResourceSource(capacity, scheduler)
-
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) }
-            .returns(SimResourceCommand.Consume(1.0, 1.0))
-            .andThenThrows(IllegalStateException())
-
-        launch { provider.consume(consumer) }
-        delay(500)
-        provider.cancel()
-
-        assertEquals(500, clock.millis())
-    }
-
-    @Test
-    fun testIdle() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val capacity = 4200.0
-        val provider = SimResourceSource(capacity, scheduler)
-
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) }
-            .returns(SimResourceCommand.Idle(clock.millis() + 500))
-            .andThen(SimResourceCommand.Exit)
-
-        provider.consume(consumer)
-
-        assertEquals(500, clock.millis())
-    }
-
-    @Test
-    fun testInfiniteSleep() {
-        assertThrows<IllegalStateException> {
-            runBlockingSimulation {
-                val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-                val capacity = 4200.0
-                val provider = SimResourceSource(capacity, scheduler)
-
-                val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-                every { consumer.onNext(any()) }
-                    .returns(SimResourceCommand.Idle())
-                    .andThenThrows(IllegalStateException())
-
-                provider.consume(consumer)
-            }
-        }
-    }
-
-    @Test
-    fun testIncorrectDeadline() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val capacity = 4200.0
-        val provider = SimResourceSource(capacity, scheduler)
-
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) }
-            .returns(SimResourceCommand.Idle(2))
-            .andThen(SimResourceCommand.Exit)
-
-        delay(10)
-
-        assertThrows<IllegalArgumentException> { provider.consume(consumer) }
-    }
-}
diff --git a/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSwitchExclusiveTest.kt b/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSwitchExclusiveTest.kt
deleted file mode 100644
index ad8d82e3..00000000
--- a/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSwitchExclusiveTest.kt
+++ /dev/null
@@ -1,176 +0,0 @@
-/*
- * Copyright (c) 2021 AtLarge Research
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package org.opendc.simulator.resources
-
-import io.mockk.every
-import io.mockk.mockk
-import kotlinx.coroutines.ExperimentalCoroutinesApi
-import kotlinx.coroutines.yield
-import org.junit.jupiter.api.Assertions.assertEquals
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.assertAll
-import org.junit.jupiter.api.assertThrows
-import org.opendc.simulator.core.runBlockingSimulation
-import org.opendc.simulator.resources.consumer.SimSpeedConsumerAdapter
-import org.opendc.simulator.resources.consumer.SimTraceConsumer
-import org.opendc.simulator.resources.impl.SimResourceInterpreterImpl
-
-/**
- * Test suite for the [SimResourceSwitchExclusive] class.
- */
-@OptIn(ExperimentalCoroutinesApi::class)
-internal class SimResourceSwitchExclusiveTest {
-    /**
-     * Test a trace workload.
-     */
-    @Test
-    fun testTrace() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-
-        val speed = mutableListOf<Double>()
-
-        val duration = 5 * 60L
-        val workload =
-            SimTraceConsumer(
-                sequenceOf(
-                    SimTraceConsumer.Fragment(duration * 1000, 28.0),
-                    SimTraceConsumer.Fragment(duration * 1000, 3500.0),
-                    SimTraceConsumer.Fragment(duration * 1000, 0.0),
-                    SimTraceConsumer.Fragment(duration * 1000, 183.0)
-                ),
-            )
-
-        val switch = SimResourceSwitchExclusive()
-        val source = SimResourceSource(3200.0, scheduler)
-        val forwarder = SimResourceForwarder()
-        val adapter = SimSpeedConsumerAdapter(forwarder, speed::add)
-        source.startConsumer(adapter)
-        switch.addInput(forwarder)
-
-        val provider = switch.newOutput()
-
-        try {
-            provider.consume(workload)
-            yield()
-        } finally {
-            provider.close()
-        }
-
-        assertAll(
-            { assertEquals(listOf(0.0, 28.0, 3200.0, 0.0, 183.0, 0.0), speed) { "Correct speed" } },
-            { assertEquals(5 * 60L * 4000, clock.millis()) { "Took enough time" } }
-        )
-    }
-
-    /**
-     * Test runtime workload on hypervisor.
-     */
-    @Test
-    fun testRuntimeWorkload() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-
-        val duration = 5 * 60L * 1000
-        val workload = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { workload.onNext(any()) } returns SimResourceCommand.Consume(duration / 1000.0, 1.0) andThen SimResourceCommand.Exit
-
-        val switch = SimResourceSwitchExclusive()
-        val source = SimResourceSource(3200.0, scheduler)
-
-        switch.addInput(source)
-
-        val provider = switch.newOutput()
-
-        try {
-            provider.consume(workload)
-            yield()
-        } finally {
-            provider.close()
-        }
-        assertEquals(duration, clock.millis()) { "Took enough time" }
-    }
-
-    /**
-     * Test two workloads running sequentially.
-     */
-    @Test
-    fun testTwoWorkloads() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-
-        val duration = 5 * 60L * 1000
-        val workload = object : SimResourceConsumer {
-            var isFirst = true
-
-            override fun onEvent(ctx: SimResourceContext, event: SimResourceEvent) {
-                when (event) {
-                    SimResourceEvent.Start -> isFirst = true
-                    else -> {}
-                }
-            }
-
-            override fun onNext(ctx: SimResourceContext): SimResourceCommand {
-                return if (isFirst) {
-                    isFirst = false
-                    SimResourceCommand.Consume(duration / 1000.0, 1.0)
-                } else {
-                    SimResourceCommand.Exit
-                }
-            }
-        }
-
-        val switch = SimResourceSwitchExclusive()
-        val source = SimResourceSource(3200.0, scheduler)
-
-        switch.addInput(source)
-
-        val provider = switch.newOutput()
-
-        try {
-            provider.consume(workload)
-            yield()
-            provider.consume(workload)
-        } finally {
-            provider.close()
-        }
-        assertEquals(duration * 2, clock.millis()) { "Took enough time" }
-    }
-
-    /**
-     * Test concurrent workloads on the machine.
-     */
-    @Test
-    fun testConcurrentWorkloadFails() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-
-        val duration = 5 * 60L * 1000
-        val workload = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { workload.onNext(any()) } returns SimResourceCommand.Consume(duration / 1000.0, 1.0) andThen SimResourceCommand.Exit
-
-        val switch = SimResourceSwitchExclusive()
-        val source = SimResourceSource(3200.0, scheduler)
-
-        switch.addInput(source)
-
-        switch.newOutput()
-        assertThrows<IllegalStateException> { switch.newOutput() }
-    }
-}
diff --git a/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSwitchMaxMinTest.kt b/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSwitchMaxMinTest.kt
deleted file mode 100644
index e4292ec0..00000000
--- a/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSwitchMaxMinTest.kt
+++ /dev/null
@@ -1,150 +0,0 @@
-/*
- * Copyright (c) 2021 AtLarge Research
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package org.opendc.simulator.resources
-
-import io.mockk.every
-import io.mockk.mockk
-import kotlinx.coroutines.ExperimentalCoroutinesApi
-import kotlinx.coroutines.coroutineScope
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.yield
-import org.junit.jupiter.api.*
-import org.junit.jupiter.api.Assertions.assertEquals
-import org.opendc.simulator.core.runBlockingSimulation
-import org.opendc.simulator.resources.consumer.SimTraceConsumer
-import org.opendc.simulator.resources.impl.SimResourceInterpreterImpl
-
-/**
- * Test suite for the [SimResourceSwitch] implementations
- */
-@OptIn(ExperimentalCoroutinesApi::class)
-internal class SimResourceSwitchMaxMinTest {
-    @Test
-    fun testSmoke() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val switch = SimResourceSwitchMaxMin(scheduler)
-
-        val sources = List(2) { SimResourceSource(2000.0, scheduler) }
-        sources.forEach { switch.addInput(it) }
-
-        val provider = switch.newOutput()
-
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) } returns SimResourceCommand.Consume(1.0, 1.0) andThen SimResourceCommand.Exit
-
-        try {
-            provider.consume(consumer)
-            yield()
-        } finally {
-            switch.close()
-        }
-    }
-
-    /**
-     * Test overcommitting of resources via the hypervisor with a single VM.
-     */
-    @Test
-    fun testOvercommittedSingle() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-
-        val duration = 5 * 60L
-        val workload =
-            SimTraceConsumer(
-                sequenceOf(
-                    SimTraceConsumer.Fragment(duration * 1000, 28.0),
-                    SimTraceConsumer.Fragment(duration * 1000, 3500.0),
-                    SimTraceConsumer.Fragment(duration * 1000, 0.0),
-                    SimTraceConsumer.Fragment(duration * 1000, 183.0)
-                ),
-            )
-
-        val switch = SimResourceSwitchMaxMin(scheduler)
-        val provider = switch.newOutput()
-
-        try {
-            switch.addInput(SimResourceSource(3200.0, scheduler))
-            provider.consume(workload)
-            yield()
-        } finally {
-            switch.close()
-        }
-
-        assertAll(
-            { assertEquals(1113300.0, switch.counters.demand, "Requested work does not match") },
-            { assertEquals(1023300.0, switch.counters.actual, "Actual work does not match") },
-            { assertEquals(90000.0, switch.counters.overcommit, "Overcommitted work does not match") },
-            { assertEquals(1200000, clock.millis()) }
-        )
-    }
-
-    /**
-     * Test overcommitting of resources via the hypervisor with two VMs.
-     */
-    @Test
-    fun testOvercommittedDual() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-
-        val duration = 5 * 60L
-        val workloadA =
-            SimTraceConsumer(
-                sequenceOf(
-                    SimTraceConsumer.Fragment(duration * 1000, 28.0),
-                    SimTraceConsumer.Fragment(duration * 1000, 3500.0),
-                    SimTraceConsumer.Fragment(duration * 1000, 0.0),
-                    SimTraceConsumer.Fragment(duration * 1000, 183.0)
-                ),
-            )
-        val workloadB =
-            SimTraceConsumer(
-                sequenceOf(
-                    SimTraceConsumer.Fragment(duration * 1000, 28.0),
-                    SimTraceConsumer.Fragment(duration * 1000, 3100.0),
-                    SimTraceConsumer.Fragment(duration * 1000, 0.0),
-                    SimTraceConsumer.Fragment(duration * 1000, 73.0)
-                )
-            )
-
-        val switch = SimResourceSwitchMaxMin(scheduler)
-        val providerA = switch.newOutput()
-        val providerB = switch.newOutput()
-
-        try {
-            switch.addInput(SimResourceSource(3200.0, scheduler))
-
-            coroutineScope {
-                launch { providerA.consume(workloadA) }
-                providerB.consume(workloadB)
-            }
-
-            yield()
-        } finally {
-            switch.close()
-        }
-        assertAll(
-            { assertEquals(2073600.0, switch.counters.demand, "Requested work does not match") },
-            { assertEquals(1053600.0, switch.counters.actual, "Granted work does not match") },
-            { assertEquals(1020000.0, switch.counters.overcommit, "Overcommitted work does not match") },
-            { assertEquals(1200000, clock.millis()) }
-        )
-    }
-}
diff --git a/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceTransformerTest.kt b/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceTransformerTest.kt
deleted file mode 100644
index cf69b7b5..00000000
--- a/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceTransformerTest.kt
+++ /dev/null
@@ -1,222 +0,0 @@
-/*
- * Copyright (c) 2021 AtLarge Research
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package org.opendc.simulator.resources
-
-import io.mockk.every
-import io.mockk.mockk
-import io.mockk.spyk
-import io.mockk.verify
-import kotlinx.coroutines.*
-import org.junit.jupiter.api.Assertions.*
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.assertThrows
-import org.opendc.simulator.core.runBlockingSimulation
-import org.opendc.simulator.resources.consumer.SimWorkConsumer
-import org.opendc.simulator.resources.impl.SimResourceInterpreterImpl
-
-/**
- * A test suite for the [SimResourceTransformer] class.
- */
-@OptIn(ExperimentalCoroutinesApi::class)
-internal class SimResourceTransformerTest {
-    @Test
-    fun testCancelImmediately() = runBlockingSimulation {
-        val forwarder = SimResourceForwarder()
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val source = SimResourceSource(2000.0, scheduler)
-
-        launch { source.consume(forwarder) }
-
-        forwarder.consume(object : SimResourceConsumer {
-            override fun onNext(ctx: SimResourceContext): SimResourceCommand {
-                return SimResourceCommand.Exit
-            }
-        })
-
-        forwarder.close()
-        source.cancel()
-    }
-
-    @Test
-    fun testCancel() = runBlockingSimulation {
-        val forwarder = SimResourceForwarder()
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val source = SimResourceSource(2000.0, scheduler)
-
-        launch { source.consume(forwarder) }
-
-        forwarder.consume(object : SimResourceConsumer {
-            var isFirst = true
-
-            override fun onNext(ctx: SimResourceContext): SimResourceCommand {
-                return if (isFirst) {
-                    isFirst = false
-                    SimResourceCommand.Consume(10.0, 1.0)
-                } else {
-                    SimResourceCommand.Exit
-                }
-            }
-        })
-
-        forwarder.close()
-        source.cancel()
-    }
-
-    @Test
-    fun testState() = runBlockingSimulation {
-        val forwarder = SimResourceForwarder()
-        val consumer = object : SimResourceConsumer {
-            override fun onNext(ctx: SimResourceContext): SimResourceCommand = SimResourceCommand.Exit
-        }
-
-        assertFalse(forwarder.isActive)
-
-        forwarder.startConsumer(consumer)
-        assertTrue(forwarder.isActive)
-
-        assertThrows<IllegalStateException> { forwarder.startConsumer(consumer) }
-
-        forwarder.cancel()
-        assertFalse(forwarder.isActive)
-
-        forwarder.close()
-        assertFalse(forwarder.isActive)
-    }
-
-    @Test
-    fun testCancelPendingDelegate() = runBlockingSimulation {
-        val forwarder = SimResourceForwarder()
-
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) } returns SimResourceCommand.Exit
-
-        forwarder.startConsumer(consumer)
-        forwarder.cancel()
-
-        verify(exactly = 0) { consumer.onEvent(any(), SimResourceEvent.Exit) }
-    }
-
-    @Test
-    fun testCancelStartedDelegate() = runBlockingSimulation {
-        val forwarder = SimResourceForwarder()
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val source = SimResourceSource(2000.0, scheduler)
-
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) } returns SimResourceCommand.Idle(10)
-
-        source.startConsumer(forwarder)
-        yield()
-        forwarder.startConsumer(consumer)
-        yield()
-        forwarder.cancel()
-
-        verify(exactly = 1) { consumer.onEvent(any(), SimResourceEvent.Start) }
-        verify(exactly = 1) { consumer.onEvent(any(), SimResourceEvent.Exit) }
-    }
-
-    @Test
-    fun testCancelPropagation() = runBlockingSimulation {
-        val forwarder = SimResourceForwarder()
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val source = SimResourceSource(2000.0, scheduler)
-
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) } returns SimResourceCommand.Idle(10)
-
-        source.startConsumer(forwarder)
-        yield()
-        forwarder.startConsumer(consumer)
-        yield()
-        source.cancel()
-
-        verify(exactly = 1) { consumer.onEvent(any(), SimResourceEvent.Start) }
-        verify(exactly = 1) { consumer.onEvent(any(), SimResourceEvent.Exit) }
-    }
-
-    @Test
-    fun testExitPropagation() = runBlockingSimulation {
-        val forwarder = SimResourceForwarder(isCoupled = true)
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val source = SimResourceSource(2000.0, scheduler)
-
-        val consumer = mockk<SimResourceConsumer>(relaxUnitFun = true)
-        every { consumer.onNext(any()) } returns SimResourceCommand.Exit
-
-        source.startConsumer(forwarder)
-        forwarder.consume(consumer)
-        yield()
-
-        assertFalse(forwarder.isActive)
-    }
-
-    @Test
-    fun testAdjustCapacity() = runBlockingSimulation {
-        val forwarder = SimResourceForwarder()
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val source = SimResourceSource(1.0, scheduler)
-
-        val consumer = spyk(SimWorkConsumer(2.0, 1.0))
-        source.startConsumer(forwarder)
-
-        coroutineScope {
-            launch { forwarder.consume(consumer) }
-            delay(1000)
-            source.capacity = 0.5
-        }
-
-        assertEquals(3000, clock.millis())
-        verify(exactly = 1) { consumer.onEvent(any(), SimResourceEvent.Capacity) }
-    }
-
-    @Test
-    fun testTransformExit() = runBlockingSimulation {
-        val forwarder = SimResourceTransformer { _, _ -> SimResourceCommand.Exit }
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val source = SimResourceSource(1.0, scheduler)
-
-        val consumer = spyk(SimWorkConsumer(2.0, 1.0))
-        source.startConsumer(forwarder)
-        forwarder.consume(consumer)
-
-        assertEquals(0, clock.millis())
-        verify(exactly = 1) { consumer.onNext(any()) }
-    }
-
-    @Test
-    fun testCounters() = runBlockingSimulation {
-        val forwarder = SimResourceForwarder()
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val source = SimResourceSource(1.0, scheduler)
-
-        val consumer = SimWorkConsumer(2.0, 1.0)
-        source.startConsumer(forwarder)
-
-        forwarder.consume(consumer)
-
-        assertEquals(source.counters.actual, forwarder.counters.actual) { "Actual work" }
-        assertEquals(source.counters.demand, forwarder.counters.demand) { "Work demand" }
-        assertEquals(source.counters.overcommit, forwarder.counters.overcommit) { "Overcommitted work" }
-        assertEquals(2000, clock.millis())
-    }
-}
diff --git a/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimWorkConsumerTest.kt b/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimWorkConsumerTest.kt
deleted file mode 100644
index 42648cf1..00000000
--- a/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimWorkConsumerTest.kt
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * Copyright (c) 2021 AtLarge Research
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package org.opendc.simulator.resources
-
-import kotlinx.coroutines.ExperimentalCoroutinesApi
-import org.junit.jupiter.api.Assertions.assertEquals
-import org.junit.jupiter.api.Test
-import org.opendc.simulator.core.runBlockingSimulation
-import org.opendc.simulator.resources.consumer.SimWorkConsumer
-import org.opendc.simulator.resources.impl.SimResourceInterpreterImpl
-
-/**
- * A test suite for the [SimWorkConsumer] class.
- */
-@OptIn(ExperimentalCoroutinesApi::class)
-internal class SimWorkConsumerTest {
-    @Test
-    fun testSmoke() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val provider = SimResourceSource(1.0, scheduler)
-
-        val consumer = SimWorkConsumer(1.0, 1.0)
-
-        provider.consume(consumer)
-        assertEquals(1000, clock.millis())
-    }
-
-    @Test
-    fun testUtilization() = runBlockingSimulation {
-        val scheduler = SimResourceInterpreterImpl(coroutineContext, clock)
-        val provider = SimResourceSource(1.0, scheduler)
-
-        val consumer = SimWorkConsumer(1.0, 0.5)
-
-        provider.consume(consumer)
-        assertEquals(2000, clock.millis())
-    }
-}