Weblogic: GC Log Generation

This entry is part 7 of 6 in the series WebLogic Server

WebLogic Server

weblogic
This post covers about GC log generation that is Garbage collection log generation in WebLogic and is must read if you are learning WebLogic.

We cover this GC log generation topic in our Oracle WebLogic Training with other topics (such as creating WebLogic domain, managed servers, clustering,deployment, logging, JMS, JTA, JDBC, JMX or security, Performance tuning and Troubleshooting).

GC Log Generation

 

1. Make java file by using below steps.

vi TestJavaGCLogging.java

2. Write below sample code in TestJavaGCLogging.java file.

package com.test;

import java.util.Map;
import java.util.HashMap;

public class TestJavaGCLogging {

/**
* @param args
*/
public static void main(String[] args) {
Map<Integer, Object> objectMap = new HashMap<Integer, Object>();

for (int i = 0; i < 5000000; i++) {
Object obj = new Object();
objectMap.put(i, obj);
}

System.out.println(“MAP size: ” + objectMap.size());
System.gc();

for (int i = 0; i < 5000000; i++) {
Object obj = new Object();
objectMap.put(i, obj);
}

System.out.println(“MAP size: ” + objectMap.size());
System.gc();

for (int i = 0; i < 5000000; i++) {
Object obj = new Object();
objectMap.put(i, obj);
}

System.out.println(“MAP size: ” + objectMap.size());
System.gc();

}
}

3. Compile your java program by using below command.

 javac TestJavaGCLogging.java

4. Execute your java program by using below command.

java TestJavaGCLogging.java

  Output:

[GC (Allocation Failure)  61164K->57832K(251392K), 0.0982666 secs]
[GC (Allocation Failure)  115498K->115328K(316928K), 0.1344700 secs]
[GC (Allocation Failure)  231564K->238464K(371200K), 0.2023053 secs]
[Full GC (Ergonomics)  238464K->213428K(593408K), 1.5529075 secs]
[GC (Allocation Failure)  344500K->376196K(659456K), 0.1887039 secs]
[Full GC (Ergonomics)  376196K->326801K(907776K), 1.7682597 secs]
MAP size: 5000000
[GC (System.gc())  346187K->345753K(972800K), 0.0677305 secs]
[Full GC (System.gc())  345753K->345580K(972800K), 2.3864599 secs]
MAP size: 5000000
[GC (System.gc())  505471K->423852K(1006592K), 0.2583115 secs]
[Full GC (System.gc())  423852K->345580K(1006592K), 2.8451946 secs]
MAP size: 5000000
[GC (System.gc())  501868K->423860K(1006592K), 0.2246933 secs]
[Full GC (System.gc())  423860K->345580K(1006592K), 1.8027748 secs]

 

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