101 lines
3.4 KiB
Java
101 lines
3.4 KiB
Java
/*
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ZZBench.java
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*
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* Copyright (c) 2001, Ted Nelson and Tuomas Lukka
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*
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* You may use and distribute under the terms of either the GNU Lesser
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* General Public License, either version 2 of the license or,
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* at your choice, any later version. Alternatively, you may use and
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* distribute under the terms of the XPL.
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*
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* See the LICENSE.lgpl and LICENSE.xpl files for the specific terms of
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* the licenses.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the README
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* file for more details.
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*
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*/
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/*
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* Written by Tuomas Lukka
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*/
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package org.gzigzag.benchmark;
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import org.gzigzag.*;
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import java.util.*;
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/** Test speeds of various simple java operations,
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* provide a generic simple speed-test framework.
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*/
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public class ZZBench {
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public static final String rcsid = "$Id: ZZBench.java,v 1.3 2001/04/01 11:38:49 tjl Exp $";
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static private void p(String s) { System.out.println(s); }
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public void runTest(String s, Runnable r) {
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// Start it up so that the JIT is ready
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for(int i=0; i<32; i++) r.run();
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// run more and more until we get over 3 secs of time.
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int nt = 20;
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long diff = 0;
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do {
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long t0 = System.currentTimeMillis();
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for(int i = nt; i >= 0; i--)
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r.run();
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long t1 = System.currentTimeMillis();
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nt *= 2;
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diff = t1 - t0;
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} while(diff < 1500);
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p(s+": "+nt+" iter, "+diff+" ms, per iter: "+
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(long)(1000000 * diff / (float)nt) + " ns");
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}
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/** Run the given tests, time them and print out the results.
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* Each test should be relatively fast to execute.
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* @param tests Triplets of String, String, Runnable:
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* first string is a unique ID for the test,
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* second string a human-readable explanation (without newlines)
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* and the Runnable is the test itself.
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*/
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public void run(Object[] tests) {
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for(int i=0; i<tests.length; i+= 3) {
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p("Running "+tests[i]+": "+tests[i+1]);
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Runnable r = (Runnable)tests[i+2];
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runTest((String)tests[i], r);
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}
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}
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public static void main(String[] argv) {
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ZZBench b = new ZZBench();
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b.run(new Object[] {
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"PUTHASH", "Put a string into a hash (same place)",
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new Runnable() { Hashtable h = new Hashtable();
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public void run() { h.put("foo", "foo"); } },
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"PUTGETCASTHASH",
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"Put, get and cast a string into a hash (same place)",
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new Runnable() { Hashtable h = new Hashtable(); String s;
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public void run() { h.put("foo", "foo");
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s = (String)h.get("foo"); } },
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"CREATE", "Create an object",
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new Runnable() { Object o;
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public void run() { o = new Object(); } },
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"CREATE4I", "Create an object with four ints inside",
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new Runnable() { Object o;
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public void run() { o = new Object() {
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int i1, i2, i3, i4;
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}; } },
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"EMPTY", "empty function",
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new Runnable() { public void run() { } },
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"INCRINT", "Increment a member integer",
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new Runnable() { int i; public void run() { i++; } },
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"ASSIGN", "assign a member to another",
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new Runnable() { ZZBench o = new ZZBench(); ZZBench b;
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public void run() { b = (ZZBench)o; } },
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"CLSCAST", "Class-cast a member, store to another",
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new Runnable() { Object o = new ZZBench(); ZZBench b;
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public void run() { b = (ZZBench)o; } },
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});
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}
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}
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