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// Copyright 2014 Google Inc. 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 java.io.OutputStream;
import java.io.PrintStream;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryUsage;
/**
* Blaze memory profiler.
*
* <p>At each call to {@code profile} performs garbage collection and stores
* heap and non-heap memory usage in an external file.
*
* <p><em>Heap memory</em> is the runtime data area from which memory for all
* class instances and arrays is allocated. <em>Non-heap memory</em> includes
* the method area and memory required for the internal processing or
* optimization of the JVM. It stores per-class structures such as a runtime
* constant pool, field and method data, and the code for methods and
* constructors. The Java Native Interface (JNI) code or the native library of
* an application and the JVM implementation allocate memory from the
* <em>native heap</em>.
*
* <p>The script in /devtools/blaze/scripts/blaze-memchart.sh can be used for post processing.
*/
public final class MemoryProfiler {
private static final MemoryProfiler INSTANCE = new MemoryProfiler();
public static MemoryProfiler instance() {
return INSTANCE;
}
private PrintStream memoryProfile;
private ProfilePhase currentPhase;
public synchronized void start(OutputStream out) {
this.memoryProfile = (out == null) ? null : new PrintStream(out);
this.currentPhase = ProfilePhase.INIT;
}
public synchronized void stop() {
if (memoryProfile != null) {
memoryProfile.close();
memoryProfile = null;
}
}
public synchronized void markPhase(ProfilePhase nextPhase) {
if (memoryProfile != null) {
String name = currentPhase.description;
ManagementFactory.getMemoryMXBean().gc();
MemoryUsage memoryUsage = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
memoryProfile.println(name + ":heap:init:" + memoryUsage.getInit());
memoryProfile.println(name + ":heap:used:" + memoryUsage.getUsed());
memoryProfile.println(name + ":heap:commited:" + memoryUsage.getCommitted());
memoryProfile.println(name + ":heap:max:" + memoryUsage.getMax());
memoryUsage = ManagementFactory.getMemoryMXBean().getNonHeapMemoryUsage();
memoryProfile.println(name + ":non-heap:init:" + memoryUsage.getInit());
memoryProfile.println(name + ":non-heap:used:" + memoryUsage.getUsed());
memoryProfile.println(name + ":non-heap:commited:" + memoryUsage.getCommitted());
memoryProfile.println(name + ":non-heap:max:" + memoryUsage.getMax());
currentPhase = nextPhase;
}
}
}
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