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/*
* Copyright (c) 2022 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.
*/
@file:JvmName("ScenarioHelpers")
package org.opendc.experiments.base.runner
import kotlinx.coroutines.coroutineScope
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch
import kotlinx.coroutines.sync.Mutex
import kotlinx.coroutines.yield
import org.opendc.compute.api.TaskState
import org.opendc.compute.failure.models.FailureModel
import org.opendc.compute.simulator.TaskWatcher
import org.opendc.compute.simulator.service.ComputeService
import org.opendc.compute.simulator.service.ServiceTask
import org.opendc.experiments.base.experiment.specs.FailureModelSpec
import org.opendc.experiments.base.experiment.specs.createFailureModel
import java.time.InstantSource
import java.util.Random
import kotlin.coroutines.coroutineContext
import kotlin.math.max
/**
* A watcher that is locked and waits for a change in the task state to unlock
* @param unlockStates determine which [TaskState] triggers an unlock.
* Default values are TERMINATED, ERROR, and DELETED.
*/
public class RunningTaskWatcher : TaskWatcher {
// TODO: make this changeable
private val unlockStates: List<TaskState> = listOf(TaskState.DELETED)
private val mutex: Mutex = Mutex()
public suspend fun lock() {
mutex.lock()
}
public suspend fun wait() {
this.lock()
}
override fun onStateChanged(
task: ServiceTask,
newState: TaskState,
) {
if (unlockStates.contains(newState)) {
mutex.unlock()
}
}
}
/**
* Helper method to replay the specified list of [Task] and suspend execution util all VMs have finished.
*
* @param clock The simulation clock.
* @param trace The trace to simulate.
* @param seed The seed to use for randomness.
* @param submitImmediately A flag to indicate that the tasks are scheduled immediately (so not at their start time).
* @param failureModelSpec A failure model to use for injecting failures.
*/
public suspend fun ComputeService.replay(
clock: InstantSource,
trace: List<ServiceTask>,
failureModelSpec: FailureModelSpec? = null,
seed: Long = 0,
submitImmediately: Boolean = false,
) {
val client = newClient()
// Create a failure model based on the failureModelSpec, if not null, otherwise set failureModel to null
val failureModel: FailureModel? =
failureModelSpec?.let {
createFailureModel(coroutineContext, clock, this, Random(seed), it)
}
try {
coroutineScope {
val startTimer = System.currentTimeMillis()
// Start the fault injector
failureModel?.start()
var simulationOffset = Long.MIN_VALUE
// val numTasks = trace.size
// var counter = 0
for (serviceTask in trace.sortedBy { it.submittedAt }) {
val now = clock.millis()
val start = serviceTask.submittedAt
// Set the simulationOffset based on the starting time of the first task
if (simulationOffset == Long.MIN_VALUE) {
simulationOffset = start - now
}
// Delay the task based on the startTime given by the trace.
if (!submitImmediately) {
delay(max(0, (start - now - simulationOffset)))
serviceTask.deadline -= simulationOffset
}
// if (counter % 100000 == 0) {
// val endTimer = System.currentTimeMillis()
//
// println("Submitted $counter / $numTasks")
// println("Finished ${String.format("%.2f", (counter.toDouble() / numTasks) * 100)}% of task submissions")
// println("Simulation has been running for: ${(endTimer - startTimer) / 1000} s")
// println("Simulation time is time: ${now / 1000 / 60 / 60} hours\n")
// }
// counter++
launch {
val task =
client.newTask(
serviceTask,
)
val taskWatcher = RunningTaskWatcher()
taskWatcher.lock()
task.watch(taskWatcher)
// Wait until the task is terminated
taskWatcher.wait()
}
}
// println("All tasks submitted, waiting for completion...")
// val endTimer = System.currentTimeMillis()
// println("Simulation has been running for: ${(endTimer - startTimer) / 1000} s")
}
yield()
} finally {
failureModel?.close()
client.close()
}
}
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