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// Copyright 2018 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.lib.profiler;
import com.google.common.base.Preconditions;
import com.sun.management.OperatingSystemMXBean;
import java.lang.management.ManagementFactory;
import java.util.concurrent.TimeUnit;
/** Thread to collect local cpu usage data and log into JSON profile. */
public class CollectLocalCpuUsage extends Thread {
// TODO(twerth): Make these configurable.
private static final long BUCKET_SIZE_MILLIS = 1000;
private static final long LOCAL_CPU_SLEEP_MILLIS = 200;
private volatile boolean stopCpuUsage;
private long cpuProfileStartMillis;
private CpuUsageTimeSeries localCpuUsage;
@Override
public void run() {
stopCpuUsage = false;
cpuProfileStartMillis = System.currentTimeMillis();
localCpuUsage = new CpuUsageTimeSeries(cpuProfileStartMillis, BUCKET_SIZE_MILLIS);
OperatingSystemMXBean bean =
(OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
long previousTimeMillis = System.currentTimeMillis();
long previousCpuTimeMillis = TimeUnit.NANOSECONDS.toMillis(bean.getProcessCpuTime());
while (!stopCpuUsage) {
try {
Thread.sleep(LOCAL_CPU_SLEEP_MILLIS);
} catch (InterruptedException e) {
return;
}
long nextTimeMillis = System.currentTimeMillis();
long nextCpuTimeMillis = TimeUnit.NANOSECONDS.toMillis(bean.getProcessCpuTime());
double deltaMillis = nextTimeMillis - previousTimeMillis;
double cpuLevel = (nextCpuTimeMillis - previousCpuTimeMillis) / deltaMillis;
localCpuUsage.addRange(previousTimeMillis, nextTimeMillis, cpuLevel);
previousTimeMillis = nextTimeMillis;
previousCpuTimeMillis = nextCpuTimeMillis;
}
}
public void stopCollecting() {
Preconditions.checkArgument(!stopCpuUsage);
stopCpuUsage = true;
}
public void logCollectedData() {
Preconditions.checkArgument(stopCpuUsage);
long currentTimeNanos = System.nanoTime();
long currentTimeMillis = System.currentTimeMillis();
int len = (int) ((currentTimeMillis - cpuProfileStartMillis) / BUCKET_SIZE_MILLIS) + 1;
double[] localCpuUsageValues = localCpuUsage.toDoubleArray(len);
Profiler profiler = Profiler.instance();
for (int i = 0; i < len; i++) {
long timeMillis = cpuProfileStartMillis + i * BUCKET_SIZE_MILLIS;
long timeNanos =
TimeUnit.MILLISECONDS.toNanos(timeMillis - currentTimeMillis) + currentTimeNanos;
profiler.logEventAtTime(
timeNanos, ProfilerTask.LOCAL_CPU_USAGE, String.valueOf(localCpuUsageValues[i]));
}
localCpuUsage = null;
}
}
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