Mercurial > hg > graal-compiler
view test/testlibrary/com/oracle/java/testlibrary/PerfCounters.java @ 21042:38b39b75500c
Mention u40 merge in changelog
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Mon, 20 Apr 2015 14:40:48 +0200 |
parents | 1a8fb39bdbc4 |
children |
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/* * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.java.testlibrary; import sun.jvmstat.monitor.Monitor; import sun.jvmstat.monitor.MonitorException; import sun.jvmstat.monitor.MonitoredHost; import sun.jvmstat.monitor.MonitoredVm; import sun.jvmstat.monitor.VmIdentifier; /** * PerfCounters can be used to get a performance counter from the currently * executing VM. * * Throws a runtime exception if an error occurs while communicating with the * currently executing VM. */ public class PerfCounters { private final static MonitoredVm vm; static { try { String pid = Integer.toString(ProcessTools.getProcessId()); VmIdentifier vmId = new VmIdentifier(pid); MonitoredHost host = MonitoredHost.getMonitoredHost(vmId); vm = host.getMonitoredVm(vmId); } catch (Exception e) { throw new RuntimeException("Could not connect to the VM"); } } /** * Returns the performance counter with the given name. * * @param name The name of the performance counter. * @throws IllegalArgumentException If no counter with the given name exists. * @throws MonitorException If an error occurs while communicating with the VM. * @return The performance counter with the given name. */ public static PerfCounter findByName(String name) throws MonitorException, IllegalArgumentException { Monitor m = vm.findByName(name); if (m == null) { throw new IllegalArgumentException("Did not find a performance counter with name " + name); } return new PerfCounter(m, name); } }