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GcTest.java
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66 lines (56 loc) · 3.09 KB
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/**
*/
package com.cpucode.java.heap;
import java.util.ArrayList;
import java.util.List;
/**
* 测试MinorGC 、 MajorGC、FullGC
* -Xms9m -Xmx9m -XX:+PrintGCDetails
* @author: cpucode
* @Date: 2021/1/5
* @Time: 21:55
* @Github: https://github.com/CPU-Code
* @CSDN: https://blog.csdn.net/qq_44226094
* */
public class GcTest {
public static void main(String[] args) {
int i = 0;
try{
List<String> list = new ArrayList<>();
String a = "https://blog.csdn.net/qq_44226094";
while (true){
list.add(a);
a = a + a;
i++;
}
} catch(Throwable t){
t.printStackTrace();
System.out.println("遍历次数为：" + i);
}
}
}
/*
Eden 满 触发 minor GC
Old 满 触发 major GC
方法区 和 Old 满 触发 Full GC
[GC (Allocation Failure) [PSYoungGen: 1980K->482K(2560K)] 1980K->877K(9728K), 0.0031065 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
[GC (Allocation Failure) [PSYoungGen: 2258K->512K(2560K)] 2654K->1863K(9728K), 0.0007478 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
[Full GC (Ergonomics) [PSYoungGen: 1677K->0K(2560K)] [ParOldGen: 6631K->4814K(7168K)] 8309K->4814K(9728K), [Metaspace: 3276K->3276K(1056768K)], 0.0045119 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
[GC (Allocation Failure) [PSYoungGen: 74K->256K(2560K)] 7000K->7182K(9728K), 0.0008215 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
[Full GC (Ergonomics) [PSYoungGen: 256K->0K(2560K)] [ParOldGen: 6926K->4837K(7168K)] 7182K->4837K(9728K), [Metaspace: 3291K->3291K(1056768K)], 0.0031570 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
[GC (Allocation Failure) [PSYoungGen: 39K->0K(2560K)] 6989K->6949K(9728K), 0.0005003 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
[Full GC (Ergonomics) [PSYoungGen: 0K->0K(2560K)] [ParOldGen: 6949K->6948K(7168K)] 6949K->6948K(9728K), [Metaspace: 3291K->3291K(1056768K)], 0.0039072 secs] [Times: user=0.00 sys=0.02, real=0.00 secs]
[GC (Allocation Failure) [PSYoungGen: 0K->0K(2560K)] 6948K->6948K(9728K), 0.0005250 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
[Full GC (Allocation Failure) [PSYoungGen: 0K->0K(2560K)] [ParOldGen: 6948K->6930K(7168K)] 6948K->6930K(9728K), [Metaspace: 3291K->3291K(1056768K)], 0.0057537 secs] [Times: user=0.00 sys=0.00, real=0.01 secs]
遍历次数为：15
Heap
PSYoungGen total 2560K, used 101K [0x00000000ffd00000, 0x0000000100000000, 0x0000000100000000)
eden space 2048K, 4% used [0x00000000ffd00000,0x00000000ffd196e0,0x00000000fff00000)
from space 512K, 0% used [0x00000000fff00000,0x00000000fff00000,0x00000000fff80000)
to space 512K, 0% used [0x00000000fff80000,0x00000000fff80000,0x0000000100000000)
ParOldGen total 7168K, used 6930K [0x00000000ff600000, 0x00000000ffd00000, 0x00000000ffd00000)
object space 7168K, 96% used [0x00000000ff600000,0x00000000ffcc4b38,0x00000000ffd00000)
Metaspace used 3326K, capacity 4496K, committed 4864K, reserved 1056768K
class space used 356K, capacity 388K, committed 512K, reserved 1048576K
java.lang.OutOfMemoryError: Java heap space
* */