我可以获得“PS Scavenge，PS MarkSweep”属性：CollectionCount，CollectionTime通过JMX。但我的问题是：“ 哪一个是年轻的gc信息？哪一个是完整的gc信息？ “我怎样才能获得有关GC的更多细节。
答案 0 :(得分：0)
jstat是jstat GC信息。这两个是不同的。
以下bean：
import java.io.Serializable;
public class PerformanceBean implements Serializable {
/**
*
*/
private static final long serialVersionUID = -6021047939070147624L;
/*
* Survivor space 0 utilization as a percentage of the space's current
* capacity.
*/
public final long jstatS0;
/*
* Survivor space 1 utilization as a percentage of the space's current
* capacity.
*/
public final long jstatS1;
/*
* Eden space utilization as a percentage of the space's current capacity.
*/
public final long jstatE;
/*
* Old space utilization as a percentage of the space's current capacity.
*/
public final long jstatO;
/*
* Permanent space utilization as a percentage of the space's current
* capacity.
*/
public final long jstatP;
/* Number of young generation GC events. */
public final long jstatYGC;
/* Young generation garbage collection time. */
public final long jstatYGCT;
/* Number of full GC events. */
public final long jstatFGC;
/* Full garbage collection time. */
public final long jstatFGCT;
/* Total garbage collection time. */
public final long jstatGCT;
/* Operation System info */
public final int availableProcessors;
public final double systemLoadAverage;
public final String osName;
public final String arch;
/*
*
* Below is a picture showing an example of a memory pool:
*<p>
*<pre>
* +----------------------------------------------+
* +//////////////// | +
* +//////////////// | +
* +----------------------------------------------+
*
* |--------|
* init
* |---------------|
* used
* |---------------------------|
* committed
* |----------------------------------------------|
* max
*<pre>
*/
/*
* Memory Usage--heapMemoryUsage
*/
public final long initHeap;
public final long usedHeap;
public final long committedHeap;
public final long maxHeap;
/* Memory Usage--nonHeapMemoryUsage */
public final long initNonHeap;
public final long usedNonHeap;
public final long committedNonHeap;
public final long maxNonHeap;
public static class Builder {
// Optional parameters - initialized to default values
private long jstatS0 = 0;
private long jstatS1 = 0;
private long jstatE = 0;
private long jstatO = 0;
private long jstatP = 0;
private long jstatYGC = 0;
private long jstatYGCT = 0;
private long jstatFGC = 0;
private long jstatFGCT = 0;
private long jstatGCT = 0;
public int availableProcessors = 0;
public double systemLoadAverage = 0;
public String osName = "";
public String arch = "";
private long initHeap = 0;
private long usedHeap = 0;
private long committedHeap = 0;
private long maxHeap = 0;
private long initNonHeap = 0;
private long usedNonHeap = 0;
private long committedNonHeap = 0;
private long maxNonHeap = 0;
public Builder jstatS0(long val) {
jstatS0 = val;
return this;
}
public Builder jstatS1(long val) {
jstatS1 = val;
return this;
}
public Builder jstatE(long val) {
jstatE = val;
return this;
}
public Builder jstatO(long val) {
jstatO = val;
return this;
}
public Builder jstatP(long val) {
jstatP = val;
return this;
}
public Builder jstatYGC(long val) {
jstatYGC = val;
return this;
}
public Builder jstatYGCT(long val) {
jstatYGCT = val;
return this;
}
public Builder jstatFGC(long val) {
jstatFGC = val;
return this;
}
public Builder jstatFGCT(long val) {
jstatFGCT = val;
return this;
}
public Builder jstatGCT(long val) {
jstatGCT = val;
return this;
}
public Builder availableProcessors(int val) {
availableProcessors = val;
return this;
}
public Builder systemLoadAverage(double val) {
systemLoadAverage = val;
return this;
}
public Builder arch(String val) {
arch = val;
return this;
}
public Builder osName(String val) {
osName = val;
return this;
}
public Builder initHeap(long val) {
initHeap = val;
return this;
}
public Builder usedHeap(long val) {
usedHeap = val;
return this;
}
public Builder committedHeap(long val) {
committedHeap = val;
return this;
}
public Builder maxHeap(long val) {
maxHeap = val;
return this;
}
public Builder initNonHeap(long val) {
initNonHeap = val;
return this;
}
public Builder usedNonHeap(long val) {
usedNonHeap = val;
return this;
}
public Builder committedNonHeap(long val) {
committedNonHeap = val;
return this;
}
public Builder maxNonHeap(long val) {
maxNonHeap = val;
return this;
}
public PerformanceBean build(){
return new PerformanceBean(this);
}
}
private PerformanceBean(Builder builder) {
jstatS0 = builder.jstatS0;
jstatS1 = builder.jstatS1;
jstatE = builder.jstatE;
jstatO = builder.jstatO;
jstatP = builder.jstatP;
jstatYGC = builder.jstatYGC;
jstatYGCT = builder.jstatYGCT;
jstatFGC = builder.jstatFGC;
jstatFGCT = builder.jstatFGCT;
jstatGCT = builder.jstatGCT;
availableProcessors = builder.availableProcessors;
systemLoadAverage = builder.systemLoadAverage;
osName = builder.osName;
arch = builder.arch;
initHeap = builder.initHeap;
usedHeap = builder.usedHeap;
committedHeap = builder.committedHeap;
maxHeap = builder.maxHeap;
initNonHeap = builder.initNonHeap;
usedNonHeap = builder.usedNonHeap;
committedNonHeap = builder.committedNonHeap;
maxNonHeap = builder.maxNonHeap;
}
// public static long getSerialversionuid() {
// return serialVersionUID;
// }
// public long getJstatS0() {
// return jstatS0;
// }
// public long getJstatS1() {
// return jstatS1;
// }
// public long getJstatE() {
// return jstatE;
// }
// public long getJstatO() {
// return jstatO;
// }
// public long getJstatP() {
// return jstatP;
// }
// public long getJstatYGC() {
// return jstatYGC;
// }
// public long getJstatYGCT() {
// return jstatYGCT;
// }
// public long getJstatFGC() {
// return jstatFGC;
// }
// public long getJstatFGCT() {
// return jstatFGCT;
// }
// public long getJstatGCT() {
// return jstatGCT;
// }
// public double getSystemLoadAverage() {
// return systemLoadAverage;
// }
// public String getOsName() {
// return osName;
// }
// public String getArch() {
// return arch;
// }
// public long getInitHeap() {
// return initHeap;
// }
// public long getUsedHeap() {
// return usedHeap;
// }
// public long getCommittedHeap() {
// return committedHeap;
// }
// public long getMaxHeap() {
// return maxHeap;
// }
// public long getInitNonHeap() {
// return initNonHeap;
// }
// public long getUsedNonHeap() {
// return usedNonHeap;
// }
// public long getCommittedNonHeap() {
// return committedNonHeap;
// }
// public long getMaxNonHeap() {
// return maxNonHeap;
// }
}