/*******************************************************************************
* Copyright 2014 Analog Devices, Inc.
*
* 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.analog.lyric.benchmarking;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryPoolMXBean;
import java.lang.management.MemoryType;
import java.util.ArrayList;
public class MemoryUsageSamplingCollector implements DataCollector
{
private ArrayList<MemoryPoolMXBean> _memoryPools = new ArrayList<MemoryPoolMXBean>();
private Poller _poller = new Poller();
public long _lastUsage = -1;
public long _totalAllocation = 0;
public MemoryUsageSamplingCollector()
{
for (MemoryPoolMXBean memoryPool : ManagementFactory
.getMemoryPoolMXBeans())
{
if (memoryPool.getType().equals(MemoryType.HEAP))
{
_memoryPools.add(memoryPool);
}
}
_poller.start();
}
enum PollerState
{
STOPPED, START_REQUESTED, POLLING, STOP_REQUESTED
}
class Poller extends Thread
{
private volatile PollerState _pollerState = PollerState.STOPPED;
public Poller()
{
super();
this.setDaemon(true);
}
@Override
public void run()
{
while (true)
{
synchronized (this)
{
// Wait until should be polling
while (_pollerState != PollerState.START_REQUESTED)
{
try
{
wait();
}
catch (InterruptedException e)
{
}
}
// Notify other threads that this thread is now polling.
_pollerState = PollerState.POLLING;
notifyAll();
}
while (_pollerState != PollerState.STOP_REQUESTED)
{
try
{
long usage = getMemoryUsage();
if ((_lastUsage != -1) && (usage > _lastUsage))
{
_totalAllocation += (usage - _lastUsage);
}
_lastUsage = usage;
Thread.sleep(0, 100000); // ~100us
}
catch (InterruptedException e)
{
}
}
// Notify other threads that this thread is no longer polling.
synchronized (this)
{
_pollerState = PollerState.STOPPED;
notifyAll();
}
}
}
// Called by other thread to cause this thread to begin polling.
// Does not return until polling.
public void startPolling()
{
synchronized (this)
{
_pollerState = PollerState.START_REQUESTED;
notifyAll();
}
synchronized (this)
{
while (_pollerState != PollerState.POLLING)
{
try
{
wait();
}
catch (InterruptedException e)
{
}
}
notifyAll();
}
}
// Called by other thread to cause this thread to stop polling.
// Does not return until polling stopped.
public synchronized void stopPolling()
{
_pollerState = PollerState.STOP_REQUESTED;
while (_pollerState != PollerState.STOPPED)
{
try
{
wait();
}
catch (InterruptedException e)
{
}
}
notifyAll();
}
}
private long getMemoryUsage()
{
long result = 0;
for (MemoryPoolMXBean memoryPool : _memoryPools)
{
long poolUsage = memoryPool.getUsage().getUsed();
result += poolUsage;
}
return result;
}
@Override
public void startCollection()
{
_poller.startPolling();
}
@Override
public void finishCollection()
{
_poller.stopPolling();
}
@Override
public void postResults(BenchmarkRunIteration iteration)
{
String key = String.format("heap.allocation");
String value = String.valueOf(_totalAllocation);
iteration.getProperties().setProperty(key, value);
_lastUsage = -1;
_totalAllocation = 0;
}
}