gclog的分析方法
一，概要通过GC的LOG也能为判断内存泄漏提供些相关信息。
二，例子说明
写一个有泄漏的程序。
package net.dncsoft;import java.util.ArrayList;import java.util.List;public class MainGCTest {public static void main(String[] args) throws Exception {byte[] buf = null;List<byte[]> bufList = new ArrayList<byte[]>();long counter = 0;while (true) {buf = new byte;bufList.add(buf);Thread.sleep(1000);System.out.println(counter++);}}}
三，运行下面的命令。
java -Xmx16m -Xms16m -XX:NewSize=4m -XX:MaxNewSize=4m -Xloggc:./gc.txt -XX:+PrintGCDetails net.dncsoft.MainGCTest
四，得到这个GCLog文件。
2.119: 2314K->2196K(16000K), 0.0047737 secs] 5.127: 5306K->5268K(16000K), 0.0050748 secs] 8.135: 8365K->8340K(16000K), 0.0051423 secs] 11.144: 11429K->11413K(16000K), 0.0055777 secs] 14.152: 14.153: 14495K->14485K(16000K), , 0.0181553 secs] 14.171: 14485K->14471K(16000K), , 0.0125105 secs] Heap def new generation total 3712K, used 3280K [0x319e0000, 0x31de0000, 0x31de0000)eden space 3328K,98% used [0x319e0000, 0x31d14358, 0x31d20000)from space 384K, 0% used [0x31d20000, 0x31d20000, 0x31d80000)to space 384K, 0% used [0x31d80000, 0x31d80000, 0x31de0000) tenured generation total 12288K, used 11264K [0x31de0000, 0x329e0000, 0x329e0000) the space 12288K,91% used [0x31de0000, 0x328e00b0, 0x328e0200, 0x329e0000) compacting perm gentotal 12288K, used 286K [0x329e0000, 0x335e0000, 0x369e0000) the space 12288K, 2% used [0x329e0000, 0x32a279d0, 0x32a27a00, 0x335e0000) ro space 10240K,51% used [0x369e0000, 0x36f0baf8, 0x36f0bc00, 0x373e0000) rw space 12288K,54% used [0x373e0000, 0x37a776d8, 0x37a77800, 0x37fe0000)
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