build: Migrate to flat project structure

This change updates the project structure to become flattened.
Previously, the simulator, frontend and API each lived into their own
directory.

With this change, all modules of the project live in the top-level
directory of the repository. This should improve discoverability of
modules of the project.

8 files changed, 879 insertions, 0 deletions

diff --git a/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/SimHypervisorTest.kt b/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/SimHypervisorTest.kt
new file mode 100644
index 00000000..a067dd2e
--- /dev/null
+++ b/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/SimHypervisorTest.kt
@@ -0,0 +1,198 @@
+/*
+ * Copyright (c) 2020 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.compute
+
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.flow.toList
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.yield
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertAll
+import org.opendc.simulator.compute.cpufreq.PerformanceScalingGovernor
+import org.opendc.simulator.compute.cpufreq.SimpleScalingDriver
+import org.opendc.simulator.compute.model.MemoryUnit
+import org.opendc.simulator.compute.model.ProcessingNode
+import org.opendc.simulator.compute.model.ProcessingUnit
+import org.opendc.simulator.compute.power.ConstantPowerModel
+import org.opendc.simulator.compute.workload.SimTraceWorkload
+import org.opendc.simulator.core.runBlockingSimulation
+
+/**
+ * Test suite for the [SimHypervisor] class.
+ */
+@OptIn(ExperimentalCoroutinesApi::class)
+internal class SimHypervisorTest {
+    private lateinit var model: SimMachineModel
+
+    @BeforeEach
+    fun setUp() {
+        val cpuNode = ProcessingNode("Intel", "Xeon", "amd64", 1)
+        model = SimMachineModel(
+            cpus = List(cpuNode.coreCount) { ProcessingUnit(cpuNode, it, 3200.0) },
+            memory = List(4) { MemoryUnit("Crucial", "MTA18ASF4G72AZ-3G2B1", 3200.0, 32_000) }
+        )
+    }
+
+    /**
+     * Test overcommitting of resources via the hypervisor with a single VM.
+     */
+    @Test
+    fun testOvercommittedSingle() = runBlockingSimulation {
+        val listener = object : SimHypervisor.Listener {
+            var totalRequestedWork = 0L
+            var totalGrantedWork = 0L
+            var totalOvercommittedWork = 0L
+
+            override fun onSliceFinish(
+                hypervisor: SimHypervisor,
+                requestedWork: Long,
+                grantedWork: Long,
+                overcommittedWork: Long,
+                interferedWork: Long,
+                cpuUsage: Double,
+                cpuDemand: Double
+            ) {
+                totalRequestedWork += requestedWork
+                totalGrantedWork += grantedWork
+                totalOvercommittedWork += overcommittedWork
+            }
+        }
+
+        val duration = 5 * 60L
+        val workloadA =
+            SimTraceWorkload(
+                sequenceOf(
+                    SimTraceWorkload.Fragment(duration * 1000, 28.0, 1),
+                    SimTraceWorkload.Fragment(duration * 1000, 3500.0, 1),
+                    SimTraceWorkload.Fragment(duration * 1000, 0.0, 1),
+                    SimTraceWorkload.Fragment(duration * 1000, 183.0, 1)
+                ),
+            )
+
+        val machine = SimBareMetalMachine(coroutineContext, clock, model, PerformanceScalingGovernor(), SimpleScalingDriver(ConstantPowerModel(0.0)))
+        val hypervisor = SimFairShareHypervisor(listener)
+
+        launch {
+            machine.run(hypervisor)
+            println("Hypervisor finished")
+        }
+        yield()
+        val vm = hypervisor.createMachine(model)
+        val res = mutableListOf<Double>()
+        val job = launch { machine.usage.toList(res) }
+
+        vm.run(workloadA)
+        yield()
+        job.cancel()
+        machine.close()
+
+        assertAll(
+            { assertEquals(1113300, listener.totalRequestedWork, "Requested Burst does not match") },
+            { assertEquals(1023300, listener.totalGrantedWork, "Granted Burst does not match") },
+            { assertEquals(90000, listener.totalOvercommittedWork, "Overcommissioned Burst does not match") },
+            { assertEquals(listOf(0.0, 0.00875, 1.0, 0.0, 0.0571875, 0.0), res) { "VM usage is correct" } },
+            { assertEquals(1200000, clock.millis()) { "Current time is correct" } }
+        )
+    }
+
+    /**
+     * Test overcommitting of resources via the hypervisor with two VMs.
+     */
+    @Test
+    fun testOvercommittedDual() = runBlockingSimulation {
+        val listener = object : SimHypervisor.Listener {
+            var totalRequestedWork = 0L
+            var totalGrantedWork = 0L
+            var totalOvercommittedWork = 0L
+
+            override fun onSliceFinish(
+                hypervisor: SimHypervisor,
+                requestedWork: Long,
+                grantedWork: Long,
+                overcommittedWork: Long,
+                interferedWork: Long,
+                cpuUsage: Double,
+                cpuDemand: Double
+            ) {
+                totalRequestedWork += requestedWork
+                totalGrantedWork += grantedWork
+                totalOvercommittedWork += overcommittedWork
+            }
+        }
+
+        val duration = 5 * 60L
+        val workloadA =
+            SimTraceWorkload(
+                sequenceOf(
+                    SimTraceWorkload.Fragment(duration * 1000, 28.0, 1),
+                    SimTraceWorkload.Fragment(duration * 1000, 3500.0, 1),
+                    SimTraceWorkload.Fragment(duration * 1000, 0.0, 1),
+                    SimTraceWorkload.Fragment(duration * 1000, 183.0, 1)
+                ),
+            )
+        val workloadB =
+            SimTraceWorkload(
+                sequenceOf(
+                    SimTraceWorkload.Fragment(duration * 1000, 28.0, 1),
+                    SimTraceWorkload.Fragment(duration * 1000, 3100.0, 1),
+                    SimTraceWorkload.Fragment(duration * 1000, 0.0, 1),
+                    SimTraceWorkload.Fragment(duration * 1000, 73.0, 1)
+                )
+            )
+
+        val machine = SimBareMetalMachine(
+            coroutineContext, clock, model, PerformanceScalingGovernor(),
+            SimpleScalingDriver(ConstantPowerModel(0.0))
+        )
+        val hypervisor = SimFairShareHypervisor(listener)
+
+        launch {
+            machine.run(hypervisor)
+        }
+
+        yield()
+        coroutineScope {
+            launch {
+                val vm = hypervisor.createMachine(model)
+                vm.run(workloadA)
+                vm.close()
+            }
+            val vm = hypervisor.createMachine(model)
+            vm.run(workloadB)
+            vm.close()
+        }
+        yield()
+        machine.close()
+        yield()
+
+        assertAll(
+            { assertEquals(2082000, listener.totalRequestedWork, "Requested Burst does not match") },
+            { assertEquals(1062000, listener.totalGrantedWork, "Granted Burst does not match") },
+            { assertEquals(1020000, listener.totalOvercommittedWork, "Overcommissioned Burst does not match") },
+            { assertEquals(1200000, clock.millis()) }
+        )
+    }
+}
diff --git a/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/SimMachineTest.kt b/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/SimMachineTest.kt
new file mode 100644
index 00000000..205f2eca
--- /dev/null
+++ b/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/SimMachineTest.kt
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2020 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.compute
+
+import kotlinx.coroutines.*
+import kotlinx.coroutines.flow.toList
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertDoesNotThrow
+import org.junit.jupiter.api.assertThrows
+import org.opendc.simulator.compute.cpufreq.PerformanceScalingGovernor
+import org.opendc.simulator.compute.cpufreq.SimpleScalingDriver
+import org.opendc.simulator.compute.model.MemoryUnit
+import org.opendc.simulator.compute.model.ProcessingNode
+import org.opendc.simulator.compute.model.ProcessingUnit
+import org.opendc.simulator.compute.power.ConstantPowerModel
+import org.opendc.simulator.compute.workload.SimFlopsWorkload
+import org.opendc.simulator.core.runBlockingSimulation
+
+/**
+ * Test suite for the [SimBareMetalMachine] class.
+ */
+@OptIn(ExperimentalCoroutinesApi::class)
+class SimMachineTest {
+    private lateinit var machineModel: SimMachineModel
+
+    @BeforeEach
+    fun setUp() {
+        val cpuNode = ProcessingNode("Intel", "Xeon", "amd64", 2)
+
+        machineModel = SimMachineModel(
+            cpus = List(cpuNode.coreCount) { ProcessingUnit(cpuNode, it, 1000.0) },
+            memory = List(4) { MemoryUnit("Crucial", "MTA18ASF4G72AZ-3G2B1", 3200.0, 32_000) }
+        )
+    }
+
+    @Test
+    fun testFlopsWorkload() = runBlockingSimulation {
+        val machine = SimBareMetalMachine(coroutineContext, clock, machineModel, PerformanceScalingGovernor(), SimpleScalingDriver(ConstantPowerModel(0.0)))
+
+        try {
+            machine.run(SimFlopsWorkload(2_000, utilization = 1.0))
+
+            // Two cores execute 1000 MFlOps per second (1000 ms)
+            assertEquals(1000, clock.millis())
+        } finally {
+            machine.close()
+        }
+    }
+
+    @Test
+    fun testDualSocketMachine() = runBlockingSimulation {
+        val cpuNode = machineModel.cpus[0].node
+        val machineModel = SimMachineModel(
+            cpus = List(cpuNode.coreCount * 2) { ProcessingUnit(cpuNode, it % 2, 1000.0) },
+            memory = List(4) { MemoryUnit("Crucial", "MTA18ASF4G72AZ-3G2B1", 3200.0, 32_000) }
+        )
+        val machine = SimBareMetalMachine(coroutineContext, clock, machineModel, PerformanceScalingGovernor(), SimpleScalingDriver(ConstantPowerModel(0.0)))
+
+        try {
+            machine.run(SimFlopsWorkload(2_000, utilization = 1.0))
+
+            // Two sockets with two cores execute 2000 MFlOps per second (500 ms)
+            assertEquals(500, clock.millis())
+        } finally {
+            machine.close()
+        }
+    }
+
+    @Test
+    fun testUsage() = runBlockingSimulation {
+        val machine = SimBareMetalMachine(coroutineContext, clock, machineModel, PerformanceScalingGovernor(), SimpleScalingDriver(ConstantPowerModel(0.0)))
+
+        val res = mutableListOf<Double>()
+        val job = launch { machine.usage.toList(res) }
+
+        try {
+            machine.run(SimFlopsWorkload(2_000, utilization = 1.0))
+            yield()
+            job.cancel()
+            assertEquals(listOf(0.0, 0.5, 1.0, 0.5, 0.0), res) { "Machine is fully utilized" }
+        } finally {
+            machine.close()
+        }
+    }
+
+    @Test
+    fun testClose() = runBlockingSimulation {
+        val machine = SimBareMetalMachine(coroutineContext, clock, machineModel, PerformanceScalingGovernor(), SimpleScalingDriver(ConstantPowerModel(0.0)))
+
+        machine.close()
+        assertDoesNotThrow { machine.close() }
+        assertThrows<IllegalStateException> { machine.run(SimFlopsWorkload(2_000, utilization = 1.0)) }
+    }
+}
diff --git a/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/SimSpaceSharedHypervisorTest.kt b/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/SimSpaceSharedHypervisorTest.kt
new file mode 100644
index 00000000..ef6f536d
--- /dev/null
+++ b/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/SimSpaceSharedHypervisorTest.kt
@@ -0,0 +1,227 @@
+/*
+ * 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.compute
+
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.toList
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.yield
+import org.junit.jupiter.api.Assertions.*
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
+import org.opendc.simulator.compute.cpufreq.PerformanceScalingGovernor
+import org.opendc.simulator.compute.cpufreq.SimpleScalingDriver
+import org.opendc.simulator.compute.model.MemoryUnit
+import org.opendc.simulator.compute.model.ProcessingNode
+import org.opendc.simulator.compute.model.ProcessingUnit
+import org.opendc.simulator.compute.power.ConstantPowerModel
+import org.opendc.simulator.compute.workload.SimFlopsWorkload
+import org.opendc.simulator.compute.workload.SimRuntimeWorkload
+import org.opendc.simulator.compute.workload.SimTraceWorkload
+import org.opendc.simulator.core.runBlockingSimulation
+
+/**
+ * A test suite for the [SimSpaceSharedHypervisor].
+ */
+@OptIn(ExperimentalCoroutinesApi::class)
+internal class SimSpaceSharedHypervisorTest {
+    private lateinit var machineModel: SimMachineModel
+
+    @BeforeEach
+    fun setUp() {
+        val cpuNode = ProcessingNode("Intel", "Xeon", "amd64", 1)
+        machineModel = SimMachineModel(
+            cpus = List(cpuNode.coreCount) { ProcessingUnit(cpuNode, it, 3200.0) },
+            memory = List(4) { MemoryUnit("Crucial", "MTA18ASF4G72AZ-3G2B1", 3200.0, 32_000) }
+        )
+    }
+
+    /**
+     * Test a trace workload.
+     */
+    @Test
+    fun testTrace() = runBlockingSimulation {
+        val usagePm = mutableListOf<Double>()
+        val usageVm = mutableListOf<Double>()
+
+        val duration = 5 * 60L
+        val workloadA =
+            SimTraceWorkload(
+                sequenceOf(
+                    SimTraceWorkload.Fragment(duration * 1000, 28.0, 1),
+                    SimTraceWorkload.Fragment(duration * 1000, 3500.0, 1),
+                    SimTraceWorkload.Fragment(duration * 1000, 0.0, 1),
+                    SimTraceWorkload.Fragment(duration * 1000, 183.0, 1)
+                ),
+            )
+
+        val machine = SimBareMetalMachine(
+            coroutineContext, clock, machineModel, PerformanceScalingGovernor(),
+            SimpleScalingDriver(ConstantPowerModel(0.0))
+        )
+        val hypervisor = SimSpaceSharedHypervisor()
+
+        val colA = launch { machine.usage.toList(usagePm) }
+        launch { machine.run(hypervisor) }
+
+        yield()
+
+        val vm = hypervisor.createMachine(machineModel)
+        val colB = launch { vm.usage.toList(usageVm) }
+        vm.run(workloadA)
+        yield()
+
+        vm.close()
+        machine.close()
+        colA.cancel()
+        colB.cancel()
+
+        assertAll(
+            { assertEquals(listOf(0.0, 0.00875, 1.0, 0.0, 0.0571875, 0.0), usagePm) { "Correct PM usage" } },
+            // Temporary limitation is that VMs do not emit usage information
+            // { assertEquals(listOf(0.0, 0.00875, 1.0, 0.0, 0.0571875, 0.0), usageVm) { "Correct VM usage" } },
+            { assertEquals(5 * 60L * 4000, clock.millis()) { "Took enough time" } }
+        )
+    }
+
+    /**
+     * Test runtime workload on hypervisor.
+     */
+    @Test
+    fun testRuntimeWorkload() = runBlockingSimulation {
+        val duration = 5 * 60L * 1000
+        val workload = SimRuntimeWorkload(duration)
+        val machine = SimBareMetalMachine(
+            coroutineContext, clock, machineModel, PerformanceScalingGovernor(),
+            SimpleScalingDriver(ConstantPowerModel(0.0))
+        )
+        val hypervisor = SimSpaceSharedHypervisor()
+
+        launch { machine.run(hypervisor) }
+        yield()
+        val vm = hypervisor.createMachine(machineModel)
+        vm.run(workload)
+        vm.close()
+        machine.close()
+
+        assertEquals(duration, clock.millis()) { "Took enough time" }
+    }
+
+    /**
+     * Test FLOPs workload on hypervisor.
+     */
+    @Test
+    fun testFlopsWorkload() = runBlockingSimulation {
+        val duration = 5 * 60L * 1000
+        val workload = SimFlopsWorkload((duration * 3.2).toLong(), 1.0)
+        val machine = SimBareMetalMachine(
+            coroutineContext, clock, machineModel, PerformanceScalingGovernor(),
+            SimpleScalingDriver(ConstantPowerModel(0.0))
+        )
+        val hypervisor = SimSpaceSharedHypervisor()
+
+        launch { machine.run(hypervisor) }
+        yield()
+        val vm = hypervisor.createMachine(machineModel)
+        vm.run(workload)
+        machine.close()
+
+        assertEquals(duration, clock.millis()) { "Took enough time" }
+    }
+
+    /**
+     * Test two workloads running sequentially.
+     */
+    @Test
+    fun testTwoWorkloads() = runBlockingSimulation {
+        val duration = 5 * 60L * 1000
+        val machine = SimBareMetalMachine(
+            coroutineContext, clock, machineModel, PerformanceScalingGovernor(),
+            SimpleScalingDriver(ConstantPowerModel(0.0))
+        )
+        val hypervisor = SimSpaceSharedHypervisor()
+
+        launch { machine.run(hypervisor) }
+        yield()
+
+        val vm = hypervisor.createMachine(machineModel)
+        vm.run(SimRuntimeWorkload(duration))
+        vm.close()
+
+        val vm2 = hypervisor.createMachine(machineModel)
+        vm2.run(SimRuntimeWorkload(duration))
+        vm2.close()
+        machine.close()
+
+        assertEquals(duration * 2, clock.millis()) { "Took enough time" }
+    }
+
+    /**
+     * Test concurrent workloads on the machine.
+     */
+    @Test
+    fun testConcurrentWorkloadFails() = runBlockingSimulation {
+        val machine = SimBareMetalMachine(
+            coroutineContext, clock, machineModel, PerformanceScalingGovernor(),
+            SimpleScalingDriver(ConstantPowerModel(0.0))
+        )
+        val hypervisor = SimSpaceSharedHypervisor()
+
+        launch { machine.run(hypervisor) }
+        yield()
+
+        hypervisor.createMachine(machineModel)
+
+        assertAll(
+            { assertFalse(hypervisor.canFit(machineModel)) },
+            { assertThrows<IllegalArgumentException> { hypervisor.createMachine(machineModel) } }
+        )
+
+        machine.close()
+    }
+
+    /**
+     * Test concurrent workloads on the machine.
+     */
+    @Test
+    fun testConcurrentWorkloadSucceeds() = runBlockingSimulation {
+        val machine = SimBareMetalMachine(
+            coroutineContext, clock, machineModel, PerformanceScalingGovernor(),
+            SimpleScalingDriver(ConstantPowerModel(0.0))
+        )
+        val hypervisor = SimSpaceSharedHypervisor()
+
+        launch { machine.run(hypervisor) }
+        yield()
+
+        hypervisor.createMachine(machineModel).close()
+
+        assertAll(
+            { assertTrue(hypervisor.canFit(machineModel)) },
+            { assertDoesNotThrow { hypervisor.createMachine(machineModel) } }
+        )
+
+        machine.close()
+    }
+}
diff --git a/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/cpufreq/DemandScalingGovernorTest.kt b/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/cpufreq/DemandScalingGovernorTest.kt
new file mode 100644
index 00000000..c482d348
--- /dev/null
+++ b/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/cpufreq/DemandScalingGovernorTest.kt
@@ -0,0 +1,48 @@
+/*
+ * 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.compute.cpufreq
+
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.verify
+import org.junit.jupiter.api.Test
+
+/**
+ * Test suite for the [DemandScalingGovernor]
+ */
+internal class DemandScalingGovernorTest {
+    @Test
+    fun testSetDemandLimit() {
+        val ctx = mockk<ScalingContext>(relaxUnitFun = true)
+
+        every { ctx.cpu.speed } returns 2100.0
+
+        val logic = DemandScalingGovernor().createLogic(ctx)
+
+        logic.onStart()
+        verify(exactly = 0) { ctx.setTarget(any()) }
+
+        logic.onLimit()
+        verify(exactly = 1) { ctx.setTarget(2100.0) }
+    }
+}
diff --git a/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/cpufreq/PStateScalingDriverTest.kt b/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/cpufreq/PStateScalingDriverTest.kt
new file mode 100644
index 00000000..bbea3ee2
--- /dev/null
+++ b/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/cpufreq/PStateScalingDriverTest.kt
@@ -0,0 +1,132 @@
+/*
+ * 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.compute.cpufreq
+
+import io.mockk.every
+import io.mockk.mockk
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+import org.opendc.simulator.compute.SimBareMetalMachine
+import org.opendc.simulator.compute.SimProcessingUnit
+import org.opendc.simulator.compute.power.ConstantPowerModel
+import org.opendc.simulator.compute.power.LinearPowerModel
+
+/**
+ * Test suite for [PStateScalingDriver].
+ */
+internal class PStateScalingDriverTest {
+    @Test
+    fun testPowerWithoutGovernor() {
+        val machine = mockk<SimBareMetalMachine>()
+
+        val driver = PStateScalingDriver(
+            sortedMapOf(
+                2800.0 to ConstantPowerModel(200.0),
+                3300.0 to ConstantPowerModel(300.0),
+                3600.0 to ConstantPowerModel(350.0),
+            )
+        )
+
+        val logic = driver.createLogic(machine)
+        assertEquals(200.0, logic.computePower())
+    }
+
+    @Test
+    fun testPowerWithSingleGovernor() {
+        val machine = mockk<SimBareMetalMachine>()
+        val cpu = mockk<SimProcessingUnit>()
+
+        every { cpu.model.frequency } returns 4100.0
+        every { cpu.speed } returns 1200.0
+
+        val driver = PStateScalingDriver(
+            sortedMapOf(
+                2800.0 to ConstantPowerModel(200.0),
+                3300.0 to ConstantPowerModel(300.0),
+                3600.0 to ConstantPowerModel(350.0),
+            )
+        )
+
+        val logic = driver.createLogic(machine)
+
+        val scalingContext = logic.createContext(cpu)
+        scalingContext.setTarget(3200.0)
+
+        assertEquals(300.0, logic.computePower())
+    }
+
+    @Test
+    fun testPowerWithMultipleGovernors() {
+        val machine = mockk<SimBareMetalMachine>()
+        val cpu = mockk<SimProcessingUnit>()
+
+        every { cpu.model.frequency } returns 4100.0
+        every { cpu.speed } returns 1200.0
+
+        val driver = PStateScalingDriver(
+            sortedMapOf(
+                2800.0 to ConstantPowerModel(200.0),
+                3300.0 to ConstantPowerModel(300.0),
+                3600.0 to ConstantPowerModel(350.0),
+            )
+        )
+
+        val logic = driver.createLogic(machine)
+
+        val scalingContextA = logic.createContext(cpu)
+        scalingContextA.setTarget(1000.0)
+
+        val scalingContextB = logic.createContext(cpu)
+        scalingContextB.setTarget(3400.0)
+
+        assertEquals(350.0, logic.computePower())
+    }
+
+    @Test
+    fun testPowerBasedOnUtilization() {
+        val machine = mockk<SimBareMetalMachine>()
+        val cpu = mockk<SimProcessingUnit>()
+
+        every { cpu.model.frequency } returns 4200.0
+
+        val driver = PStateScalingDriver(
+            sortedMapOf(
+                2800.0 to LinearPowerModel(200.0, 100.0),
+                3300.0 to LinearPowerModel(250.0, 150.0),
+                4000.0 to LinearPowerModel(300.0, 200.0),
+            )
+        )
+
+        val logic = driver.createLogic(machine)
+
+        val scalingContext = logic.createContext(cpu)
+
+        every { cpu.speed } returns 1400.0
+        scalingContext.setTarget(1400.0)
+        assertEquals(150.0, logic.computePower())
+
+        every { cpu.speed } returns 1400.0
+        scalingContext.setTarget(4000.0)
+        assertEquals(235.0, logic.computePower())
+    }
+}
diff --git a/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/power/PowerModelTest.kt b/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/power/PowerModelTest.kt
new file mode 100644
index 00000000..dd93302b
--- /dev/null
+++ b/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/power/PowerModelTest.kt
@@ -0,0 +1,70 @@
+package org.opendc.simulator.compute.power
+
+import org.junit.jupiter.api.Assertions.assertAll
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.params.ParameterizedTest
+import org.junit.jupiter.params.provider.Arguments
+import org.junit.jupiter.params.provider.MethodSource
+import java.util.stream.Stream
+import kotlin.math.pow
+
+internal class PowerModelTest {
+    private val epsilon = 10.0.pow(-3)
+    private val cpuUtil = 0.9
+
+    @ParameterizedTest
+    @MethodSource("MachinePowerModelArgs")
+    fun `compute power consumption given CPU loads`(
+        powerModel: PowerModel,
+        expectedPowerConsumption: Double
+    ) {
+        val computedPowerConsumption = powerModel.computePower(cpuUtil)
+        assertEquals(expectedPowerConsumption, computedPowerConsumption, epsilon)
+    }
+
+    @ParameterizedTest
+    @MethodSource("MachinePowerModelArgs")
+    fun `ignore idle power when computing power consumptions`(
+        powerModel: PowerModel,
+        expectedPowerConsumption: Double
+    ) {
+        val zeroPowerModel = ZeroIdlePowerDecorator(powerModel)
+
+        assertAll(
+            { assertEquals(expectedPowerConsumption, zeroPowerModel.computePower(cpuUtil), epsilon) },
+            { assertEquals(0.0, zeroPowerModel.computePower(0.0)) }
+        )
+    }
+
+    @Test
+    fun `compute power draw by the SPEC benchmark model`() {
+        val powerModel = InterpolationPowerModel("IBMx3550M3_XeonX5675")
+
+        assertAll(
+            { assertEquals(58.4, powerModel.computePower(0.0)) },
+            { assertEquals(58.4 + (98 - 58.4) / 5, powerModel.computePower(0.02)) },
+            { assertEquals(98.0, powerModel.computePower(0.1)) },
+            { assertEquals(140.0, powerModel.computePower(0.5)) },
+            { assertEquals(189.0, powerModel.computePower(0.8)) },
+            { assertEquals(189.0 + 0.7 * 10 * (205 - 189) / 10, powerModel.computePower(0.87)) },
+            { assertEquals(205.0, powerModel.computePower(0.9)) },
+            { assertEquals(222.0, powerModel.computePower(1.0)) },
+        )
+    }
+
+    @Suppress("unused")
+    private companion object {
+        @JvmStatic
+        fun MachinePowerModelArgs(): Stream<Arguments> = Stream.of(
+            Arguments.of(ConstantPowerModel(0.0), 0.0),
+            Arguments.of(LinearPowerModel(350.0, 200.0), 335.0),
+            Arguments.of(SquarePowerModel(350.0, 200.0), 321.5),
+            Arguments.of(CubicPowerModel(350.0, 200.0), 309.35),
+            Arguments.of(SqrtPowerModel(350.0, 200.0), 342.302),
+            Arguments.of(MsePowerModel(350.0, 200.0, 1.4), 340.571),
+            Arguments.of(AsymptoticPowerModel(350.0, 200.0, 0.3, false), 338.765),
+            Arguments.of(AsymptoticPowerModel(350.0, 200.0, 0.3, true), 323.072),
+        )
+    }
+}
diff --git a/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/workload/SimFlopsWorkloadTest.kt b/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/workload/SimFlopsWorkloadTest.kt
new file mode 100644
index 00000000..b3e57453
--- /dev/null
+++ b/opendc-simulator/opendc-simulator-compute/src/test/kotlin/org/opendc/simulator/compute/workload/SimFlopsWorkloadTest.kt
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2020 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.compute.workload
+
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
+
+/**
+ * Test suite for [SimFlopsWorkload] class.
+ */
+class SimFlopsWorkloadTest {
+    @Test
+    fun testFlopsNonNegative() {
+        assertThrows<IllegalArgumentException>("FLOPs must be non-negative") {
+            SimFlopsWorkload(-1)
+        }
+    }
+
+    @Test
+    fun testUtilizationNonZero() {
+        assertThrows<IllegalArgumentException>("Utilization cannot be zero") {
+            SimFlopsWorkload(1, 0.0)
+        }
+    }
+
+    @Test
+    fun testUtilizationPositive() {
+        assertThrows<IllegalArgumentException>("Utilization cannot be negative") {
+            SimFlopsWorkload(1, -1.0)
+        }
+    }
+
+    @Test
+    fun testUtilizationNotLargerThanOne() {
+        assertThrows<IllegalArgumentException>("Utilization cannot be larger than one") {
+            SimFlopsWorkload(1, 2.0)
+        }
+    }
+}
diff --git a/opendc-simulator/opendc-simulator-compute/src/test/resources/spec_machines.yml b/opendc-simulator/opendc-simulator-compute/src/test/resources/spec_machines.yml
new file mode 100644
index 00000000..d51cba80
--- /dev/null
+++ b/opendc-simulator/opendc-simulator-compute/src/test/resources/spec_machines.yml
@@ -0,0 +1,29 @@
+---
+# The power model of an IBM server x3550 (2 x [Xeon X5675 3067 MHz, 6 cores], 16GB).<br/>
+# <a href="http://www.spec.org/power_ssj2008/results/res2011q2/power_ssj2008-20110406-00368.html">
+# http://www.spec.org/power_ssj2008/results/res2011q2/power_ssj2008-20110406-00368.html</a>
+IBMx3550M3_XeonX5675: [58.4, 98.0, 109.0, 118.0, 128.0, 140.0, 153.0, 170.0, 189.0, 205.0, 222.0]
+ # The power model of an IBM server x3550 (2 x [Xeon X5670 2933 MHz, 6 cores], 12GB).<br/>
+ # <a href="http://www.spec.org/power_ssj2008/results/res2010q2/power_ssj2008-20100315-00239.html">
+ # http://www.spec.org/power_ssj2008/results/res2010q2/power_ssj2008-20100315-00239.html</a>
+IBMx3550M3_XeonX5670: [66.0, 107.0, 120.0, 131.0, 143.0, 156.0, 173.0, 191.0, 211.0, 229.0, 247.0]
+ # the power model of an IBM server x3250 (1 x [Xeon X3480 3067 MHz, 4 cores], 8GB).<br/>
+ # <a href="http://www.spec.org/power_ssj2008/results/res2010q4/power_ssj2008-20101001-00297.html">
+ # http://www.spec.org/power_ssj2008/results/res2010q4/power_ssj2008-20101001-00297.html</a>
+IBMx3250M3_XeonX3480: [42.3, 46.7, 49.7, 55.4, 61.8, 69.3, 76.1, 87.0, 96.1, 106.0, 113.0]
+ # The power model of an IBM server x3250 (1 x [Xeon X3470 2933 MHz, 4 cores], 8GB).<br/>
+ # <a href="http://www.spec.org/power_ssj2008/results/res2009q4/power_ssj2008-20091104-00213.html">
+ # http://www.spec.org/power_ssj2008/results/res2009q4/power_ssj2008-20091104-00213.html</a>
+IBMx3250M3_XeonX3470: [41.6, 46.7, 52.3, 57.9, 65.4, 73.0, 80.7, 89.5, 99.6, 105.0, 113.0]
+ # The power model of an HP ProLiant ML110 G5 (1 x [Xeon 3075 2660 MHz, 2 cores], 4GB).<br/>
+ # <a href="http://www.spec.org/power_ssj2008/results/res2011q1/power_ssj2008-20110124-00339.html">
+ # http://www.spec.org/power_ssj2008/results/res2011q1/power_ssj2008-20110124-00339.html</a>
+HPProLiantMl110G5_Xeon3075: [93.7, 97.0, 101.0, 105.0, 110.0, 116.0, 121.0, 125.0, 129.0, 133.0, 135.0]
+ # The power model of an HP ProLiant ML110 G4 (1 x [Xeon 3040 1860 MHz, 2 cores], 4GB).<br/>
+ # <a href="http://www.spec.org/power_ssj2008/results/res2011q1/power_ssj2008-20110127-00342.html">
+ # http://www.spec.org/power_ssj2008/results/res2011q1/power_ssj2008-20110127-00342.html</a>
+HPProLiantMl110G4_Xeon3040: [86.0, 89.4, 92.6, 96.0, 99.5, 102.0, 106.0, 108.0, 112.0, 114.0, 117.0]
+ # The power model of an HP ProLiant ML110 G3 (1 x [Pentium D930 3000 MHz, 2 cores], 4GB).<br/>
+ # <a href="http://www.spec.org/power_ssj2008/results/res2011q1/power_ssj2008-20110127-00342.html">
+ # http://www.spec.org/power_ssj2008/results/res2011q1/power_ssj2008-20110127-00342.html</a>
+HPProLiantMl110G3_PentiumD930: [105.0, 112.0, 118.0, 125.0, 131.0, 137.0, 147.0, 153.0, 157.0, 164.0, 169.0]