-XX:+HitachiVerboseGCPrintCause

This option outputs the cause of garbage collection to the end of extended verbosegc information.

-XX:-HitachiVerboseGCPrintCause

This option outputs the extended verbosegc information in the normal format.

Specify whether to output the cause of the garbage collection.

Default value

• -XX:+HitachiVerboseGCPrintCause

Prerequisite options

• -XX:+HitachiVerboseGC

When the -XX:+HitachiCommaVerboseGC option is specified, the following cause numbers are output:

Table 16-6 List of causes of garbage collection

Cause number	Cause	Description
0	ObjAllocFail	The garbage collection occurred due to the failure in object allocation.
1	System.gc	The garbage collection occurred due to the invocation of the java.lang.System.gc method.
2	PermAllocFail	The garbage collection occurred due to the failure in allocation of the permanent heap.
3	DelayedGC	The reserved garbage collection is invoked by the JNI and JVMPI.
4	JavaGC Command	The garbage collection occurred by the JavaGC command
5	LastPermGC	The last garbage collection before throwing the OutOfMemoryError of permanent heap occurred.
6	JHeapProf Command	The garbage collection occurred due to the jheapprof command.
8	EMReclaimFail	There was a Java heap overflow because objects were moved to the Java heap due to the explicit release of the Explicit memory.
9	EMMigrateFail	There was a Java heap overflow because objects were moved to the Java heap due to the automatic release of the Explicit memory.
10	JVMTIForceGC	Garbage collection occurred due to the JVMTI function ForceGarbageCollection().
11	PromotionFail	Garbage collection occurred due to promotion failure in copy garbage collection.
12	EMJavaGC Command	Garbage collection occurred due to the release of the Explicit memory block by the javagc command.
13	EHeapProf Command	Garbage collection occurred due to the eheapprof command.

[VGC]<Wed Mar 17 00:42:30 2004>(Skip Full:0,Copy:0)[Full GC 149K->149K(1984K), 0.0786038 secs][DefNew::Eden: 264K->0K(512K)][DefNew::Survivor: 0K->63K(64K)][Tenured: 85K->149K(1408K)][Perm: 1300K->1300K(1536K)][cause:System.gc]