| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.brooklyn.test; |
| |
| import java.lang.management.ManagementFactory; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.ThreadFactory; |
| import java.util.concurrent.TimeUnit; |
| |
| import javax.management.MBeanServer; |
| import javax.management.ObjectName; |
| |
| import org.apache.brooklyn.util.time.Duration; |
| import org.apache.brooklyn.util.time.Time; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.common.base.Stopwatch; |
| |
| public class PerformanceTestUtils { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(PerformanceTestUtils.class); |
| |
| private static boolean hasLoggedProcessCpuTimeUnavailable; |
| |
| public static long getProcessCpuTime() { |
| try { |
| MBeanServer mbeanServer = ManagementFactory.getPlatformMBeanServer(); |
| ObjectName osMBeanName = ObjectName.getInstance(ManagementFactory.OPERATING_SYSTEM_MXBEAN_NAME); |
| return (Long) mbeanServer.getAttribute(osMBeanName, "ProcessCpuTime"); |
| } catch (Exception e) { |
| if (!hasLoggedProcessCpuTimeUnavailable) { |
| hasLoggedProcessCpuTimeUnavailable = true; |
| LOG.warn("ProcessCPuTime not available in local JVM MXBean "+ManagementFactory.OPERATING_SYSTEM_MXBEAN_NAME+" (only available in sun JVM?)"); |
| } |
| return -1; |
| } |
| } |
| |
| /** |
| * Creates a background thread that will log.info the CPU fraction usage repeatedly, sampling at the given period. |
| * Callers <em>must</em> cancel the returned future, e.g. {@code future.cancel(true)}, otherwise it will keep |
| * logging until the JVM exits. |
| */ |
| public static Future<?> sampleProcessCpuTime(final Duration period, final String loggingContext) { |
| final ExecutorService executor = Executors.newSingleThreadExecutor(new ThreadFactory() { |
| @Override public Thread newThread(Runnable r) { |
| Thread thread = new Thread(r, "brooklyn-sampleProcessCpuTime-"+loggingContext); |
| thread.setDaemon(true); // let the JVM exit |
| return thread; |
| }}); |
| Future<?> future = executor.submit(new Runnable() { |
| @Override public void run() { |
| try { |
| long prevCpuTime = getProcessCpuTime(); |
| if (prevCpuTime == -1) { |
| LOG.warn("ProcessCPuTime not available; cannot sample; aborting"); |
| return; |
| } |
| while (true) { |
| Stopwatch stopwatch = Stopwatch.createStarted(); |
| Thread.sleep(period.toMilliseconds()); |
| long currentCpuTime = getProcessCpuTime(); |
| |
| long elapsedTime = stopwatch.elapsed(TimeUnit.MILLISECONDS); |
| double fractionCpu = (elapsedTime > 0) ? ((double)currentCpuTime-prevCpuTime) / TimeUnit.MILLISECONDS.toNanos(elapsedTime) : -1; |
| prevCpuTime = currentCpuTime; |
| |
| LOG.info("CPU fraction over last {} was {} ({})", new Object[] { |
| Time.makeTimeStringRounded(elapsedTime), fractionCpu, loggingContext}); |
| } |
| } catch (InterruptedException e) { |
| return; // graceful termination |
| } finally { |
| executor.shutdownNow(); |
| } |
| }}); |
| return future; |
| } |
| } |