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package org.apache.jcs;
import java.util.Hashtable;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.jcs.engine.memory.lru.LRUMemoryCache;
/**
* This test ensures that basic memory operations are with a speficified order
* of magnitude of the java.util.Hashtable.
* <p>
* Currenlty JCS is un 2x a hashtable for gets, and under 1.2x for puts.
*
*/
public class JCSvsHashtablePerformanceTest
extends TestCase
{
float ratioPut = 0;
float ratioGet = 0;
float target = 3.50f;
int loops = 20;
int tries = 50000;
/**
* @param testName
*/
public JCSvsHashtablePerformanceTest( String testName )
{
super( testName );
}
/**
* A unit test suite for JUnit
*
* @return The test suite
*/
public static Test suite()
{
return new TestSuite( JCSvsHashtablePerformanceTest.class );
}
/**
* A unit test for JUnit
*
* @exception Exception
* Description of the Exception
*/
public void testSimpleLoad()
throws Exception
{
Log log1 = LogFactory.getLog( LRUMemoryCache.class );
if ( log1.isDebugEnabled() )
{
System.out.println( "The log level must be at info or above for the a performance test." );
return;
}
Log log2 = LogFactory.getLog( JCS.class );
if ( log2.isDebugEnabled() )
{
System.out.println( "The log level must be at info or above for the a performance test." );
return;
}
doWork();
assertTrue( this.ratioPut < target );
assertTrue( this.ratioGet < target );
}
/**
*
*/
public void doWork()
{
long start = 0;
long end = 0;
long time = 0;
float tPer = 0;
long putTotalJCS = 0;
long getTotalJCS = 0;
long putTotalHashtable = 0;
long getTotalHashtable = 0;
try
{
JCS.setConfigFilename( "/TestJCSvHashtablePerf.ccf" );
JCS cache = JCS.getInstance( "testCache1" );
for ( int j = 0; j < loops; j++ )
{
String name = "JCS ";
start = System.currentTimeMillis();
for ( int i = 0; i < tries; i++ )
{
cache.put( "key:" + i, "data" + i );
}
end = System.currentTimeMillis();
time = end - start;
putTotalJCS += time;
tPer = Float.intBitsToFloat( (int) time ) / Float.intBitsToFloat( tries );
System.out.println( name + " put time for " + tries + " = " + time + "; millis per = " + tPer );
start = System.currentTimeMillis();
for ( int i = 0; i < tries; i++ )
{
cache.get( "key:" + i );
}
end = System.currentTimeMillis();
time = end - start;
getTotalJCS += time;
tPer = Float.intBitsToFloat( (int) time ) / Float.intBitsToFloat( tries );
System.out.println( name + " get time for " + tries + " = " + time + "; millis per = " + tPer );
// /////////////////////////////////////////////////////////////
name = "Hashtable";
Hashtable cache2 = new Hashtable();
start = System.currentTimeMillis();
for ( int i = 0; i < tries; i++ )
{
cache2.put( "key:" + i, "data" + i );
}
end = System.currentTimeMillis();
time = end - start;
putTotalHashtable += time;
tPer = Float.intBitsToFloat( (int) time ) / Float.intBitsToFloat( tries );
System.out.println( name + " put time for " + tries + " = " + time + "; millis per = " + tPer );
start = System.currentTimeMillis();
for ( int i = 0; i < tries; i++ )
{
cache2.get( "key:" + i );
}
end = System.currentTimeMillis();
time = end - start;
getTotalHashtable += time;
tPer = Float.intBitsToFloat( (int) time ) / Float.intBitsToFloat( tries );
System.out.println( name + " get time for " + tries + " = " + time + "; millis per = " + tPer );
System.out.println( "\n" );
}
}
catch ( Exception e )
{
e.printStackTrace( System.out );
System.out.println( e );
}
long putAvJCS = putTotalJCS / loops;
long getAvJCS = getTotalJCS / loops;
long putAvHashtable = putTotalHashtable / loops;
long getAvHashtable = getTotalHashtable / loops;
System.out.println( "Finished " + loops + " loops of " + tries + " gets and puts" );
System.out.println( "\n" );
System.out.println( "Put average for JCS = " + putAvJCS );
System.out.println( "Put average for Hashtable = " + putAvHashtable );
ratioPut = Float.intBitsToFloat( (int) putAvJCS ) / Float.intBitsToFloat( (int) putAvHashtable );
System.out.println( "JCS puts took " + ratioPut + " times the Hashtable, the goal is <" + target + "x" );
System.out.println( "\n" );
System.out.println( "Get average for JCS = " + getAvJCS );
System.out.println( "Get average for Hashtable = " + getAvHashtable );
ratioGet = Float.intBitsToFloat( (int) getAvJCS ) / Float.intBitsToFloat( (int) getAvHashtable );
System.out.println( "JCS gets took " + ratioGet + " times the Hashtable, the goal is <" + target + "x" );
}
/**
* @param args
*/
public static void main( String args[] )
{
JCSvsHashtablePerformanceTest test = new JCSvsHashtablePerformanceTest( "command" );
test.doWork();
}
}