/*
* @(#)FastSync.java 1.10 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program 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 program 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 at /legal/license.txt).
*
* 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 Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
class FastSyncInner {
public static synchronized void syncedMethod() { }
}
public class FastSync {
private static void nullMethod() { }
private static synchronized void syncedMethod() { }
private static synchronized void syncedMethod2() { syncedMethod(); }
private static synchronized void syncedMethod2Other() {
FastSyncInner.syncedMethod();
}
private static synchronized void syncedMethodME1(Object lock) {
synchronized (lock) {
}
}
private static synchronized void
syncedMethodME2(Object lock, Object lock2) {
synchronized (lock) {
synchronized (lock2) {
}
}
}
public static void main(String args[]) {
int iterations = Integer.parseInt(args[0]);
Object lock = new Object();
Object lock2 = new Object();
Object lock3 = new Object();
Object lock4 = new Object();
/* Warm up JIT: */
for (int i = 0; i < iterations; ++i) {
System.currentTimeMillis();
}
long t0 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
}
long t1 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
synchronized (lock) {
}
}
long t2 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
nullMethod();
}
long t3 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
syncedMethod();
}
long t4 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
synchronized (lock) {
synchronized (lock) {
}
}
}
long t5 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
syncedMethod2();
}
long t6 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
synchronized (lock) {
synchronized (lock2) {
}
}
}
long t7 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
syncedMethod2Other();
}
long t8 = System.currentTimeMillis();
long t9, t10, t11, t12;
synchronized (lock) {
t9 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
synchronized (lock) {
}
}
t10 = System.currentTimeMillis();
}
synchronized (lock) {
t11 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
synchronized (lock2) {
}
}
t12 = System.currentTimeMillis();
}
long t13 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
synchronized (lock) {
synchronized (lock) {
synchronized (lock) {
synchronized (lock) {
}
}
}
}
}
long t14 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
synchronized (lock) {
synchronized (lock2) {
synchronized (lock3) {
synchronized (lock4) {
}
}
}
}
}
long t15 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
syncedMethodME1(lock);
}
long t16 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
syncedMethodME2(lock, lock2);
}
long t17 = System.currentTimeMillis();
System.out.println("Time numbers has been adjusted for null loop and" +
" null method times respectively:");
System.out.println("");
System.out.println("null loop " + iterations + " iterations in " +
(t1 - t0) + "ms");
System.out.println("nullMethod " + iterations + " iterations in " +
(t3 - t2 - (t1 - t0)) + "ms");
System.out.println("monenter/exit o1 " + iterations +
" iterations in " + (t2 - t1 - (t1 - t0)) + "ms");
System.out.println("monenter/exit o1 + o1 " + iterations +
" iterations in " + (t5 - t4 - (t1 - t0)) + "ms");
System.out.println("monenter/exit o1 + o2 " + iterations +
" iterations in " + (t7 - t6 - (t1 - t0)) + "ms");
System.out.println("monenter/exit o1 + o1: 2nd o1 time " + iterations +
" iterations in " + (t10 - t9 - (t1 - t0)) + "ms");
System.out.println("monenter/exit o1 + o2: o2 time " + iterations +
" iterations in " + (t12 - t11 - (t1 - t0)) + "ms");
System.out.println("monenter/exit o1 + o1 + o1 + o1 " + iterations +
" iterations in " + (t14 - t13 - (t1 - t0)) + "ms");
System.out.println("monenter/exit o1 + o2 + o3 + o4 " + iterations +
" iterations in " + (t15 - t14 - (t1 - t0)) + "ms");
System.out.println("sync method c1 " + iterations + " iterations in " +
(t4 - t3 - (t3 - t2)) + "ms");
System.out.println("sync method c1 + c1 " + iterations +
" iterations in " + (t6 - t5 - (t3 - t2)) + "ms");
System.out.println("sync method c1 + c2 " + iterations +
" iterations in " + (t8 - t7 - (t3 - t2)) + "ms");
System.out.println("sync method c1 + mon o1 " + iterations +
" iterations in " + (t16 - t15 - (t3 - t2)) + "ms");
System.out.println("sync method c1 + mon o1 + o2 " + iterations +
" iterations in " + (t17 - t16 - (t3 - t2)) + "ms");
System.out.println("");
}
}