/* * Copyright (c) 2016, 2018, 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.
*/
publicstatic Path createProfilingRecording() throws Exception {
Path file = Utils.createTempFile("profiling-recording", ".jfr"); // Create a recording with some data try (Recording r = new Recording(Configuration.getConfiguration("profile"))) {
r.start();
// Allocation event
array = new Object[1000000];
array = null;
// Class loading event etc
provokeClassLoading();
// GC events
System.gc();
// ExecutionSample long t = System.currentTimeMillis(); while (System.currentTimeMillis() - t < 50) { // do nothing
}
// Other periodic events, i.e CPU load Thread.sleep(1000);
r.stop();
r.dump(file);
}
return file;
}
privatestaticvoid provokeClassLoading() { // Matching a string with regexp // is expected to load some classes and generate some VM events
Pattern p = Pattern.compile("a*b");
Matcher m = p.matcher("aaaaab");
m.matches();
}
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.