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/*
* 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.compute.carbon
import org.opendc.simulator.compute.power.CarbonFragment
import org.opendc.trace.Trace
import org.opendc.trace.conv.CARBON_INTENSITY
import org.opendc.trace.conv.CARBON_TIMESTAMP
import org.opendc.trace.conv.TABLE_CARBON
import java.io.File
import java.lang.ref.SoftReference
import java.time.Instant
import java.util.concurrent.ConcurrentHashMap
/**
* A helper class for loading compute workload traces into memory.
*
*/
public class CarbonTraceLoader {
/**
* The cache of workloads.
*/
private val cache = ConcurrentHashMap<String, SoftReference<List<CarbonFragment>>>()
private val builder = CarbonFragmentNewBuilder()
/**
* Read the metadata into a workload.
*/
private fun parseCarbon(trace: Trace): List<CarbonFragment> {
val reader = checkNotNull(trace.getTable(TABLE_CARBON)).newReader()
val startTimeCol = reader.resolve(CARBON_TIMESTAMP)
val carbonIntensityCol = reader.resolve(CARBON_INTENSITY)
try {
while (reader.nextRow()) {
val startTime = reader.getInstant(startTimeCol)!!
val carbonIntensity = reader.getDouble(carbonIntensityCol)
builder.add(startTime, carbonIntensity)
}
// Make sure the virtual machines are ordered by start time
builder.fixReportTimes()
return builder.fragments
} catch (e: Exception) {
e.printStackTrace()
throw e
} finally {
reader.close()
}
}
/**
* Load the Carbon Trace at the given path.
*/
public fun get(pathToFile: File): List<CarbonFragment> {
val trace = Trace.open(pathToFile, "carbon")
return parseCarbon(trace)
}
/**
* Clear the workload cache.
*/
public fun reset() {
cache.clear()
}
/**
* A builder for a VM trace.
*/
private class CarbonFragmentNewBuilder {
/**
* The total load of the trace.
*/
val fragments: MutableList<CarbonFragment> = mutableListOf()
/**
* Add a fragment to the trace.
*
* @param startTime Timestamp at which the fragment starts (in epoch millis).
* @param carbonIntensity The carbon intensity during this fragment
*/
fun add(
startTime: Instant,
carbonIntensity: Double,
) {
fragments.add(
CarbonFragment(
startTime.toEpochMilli(),
Long.MAX_VALUE,
carbonIntensity,
),
)
}
fun fixReportTimes() {
fragments.sortBy { it.startTime }
// For each report, set the end time to the start time of the next report
for (i in 0..fragments.size - 2) {
fragments[i].endTime = fragments[i + 1].startTime
}
// Set the start time of each report to the minimum value
fragments[0].startTime = Long.MIN_VALUE
}
}
}
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