-XX:[+|-]HitachiVerboseGC (Option for extended verbosegc information output)

[id] date (Skip Full:full_count, Copy:copy_count) [gc_kind gc_info, gc_time secs][Eden: eden_info][Survivor: survivor_info][Tenured: tenured_info][Perm: perm_info] [cause:cause_info] [User: user_cpu secs] [Sys: system_cpu secs] [CCI: cc_used_sizeK, cc_max_sizeK, cc_infoK]

The following is a description of the output contents:

id: VGC (Identifier of the JavaVM log file)

date: Indicates the date and time for starting garbage collection.; When the -XX:-HitachiVerboseGCPrintDate option is specified, the date is not output.

full_count: Indicates the number of times the output of full GC information is skipped.; This is output when the -XX:HitachiVerboseGCIntervalTime option is specified.

copy_count: Indicates the number of times the output of copy GC information is skipped.; This is output when the -XX:HitachiVerboseGCIntervalTime option is specified.

gc_kind: Indicates the garbage collection type. "FullGC" or "GC" is output.

gc_info

Indicates the garbage collection information. The information is output in the following format:

area-length-before-the-garbage-collection -> area-length-after-the-garbage-collection (area-size)

gc_time: Indicates the elapsed time for garbage collection.

Eden: Indicates the type of eden. "DefNew::Eden" or "ParNew::Eden" is output.

eden_info

Indicates the Eden information. The information is output in the following format:

area-length-before-the-garbage-collection -> area-length-after-the-garbage-collection (area-size)

Servivor: Indicates the survivor type. "DefNew:: Survivor" or "ParNew::Survivor" is output.

survivor_info

Indicates the Survivor information. The information is output in the following format:

area-length-before-the-garbage-collection -> area-length-after-the-garbage-collection (area-size)

Tenured: Indicates the type of Tenured. "Tenured" is output.

tenured_info

Indicates the Tenured information. The information is output in the following format:

area-length-before-the-garbage-collection -> area-length-after-the-garbage-collection (area-size)

Perm: Indicates the type of Perm. "Perm" is output.

perm_info

Indicates the Perm information. The information is output in the following format:

area-length-before-the-garbage-collection -> area-length-after-the-garbage-collection (area-size)

cause_info: Indicates the cause of garbage collection.; When the -XX:-HitachiVerboseGCPrintCause option is specified, this information is not output.

user_cpu: Indicates the CPU time that the garbage collection thread has consumed in the user mode. The unit is in seconds.; If the -XX:+UseParNewGC option is specified, user_cpu becomes the total CPU time spent in the user mode by all the garbage collection threads.; If an attempt to obtain the CPU time fails, unknown is displayed as in the case of [User: unknown].; When the -XX:-HitachiVerboseGCCpuTime option is specified, the information is not output.

system_cpu: Indicates the CPU time that the garbage collection thread has consumed in the kernel mode. The unit is in seconds.; If the -XX:+UseParNewGC option is specified, system_cpu becomes the total CPU time spent by all the garbage collection threads in the kernel mode.; If an attempt to obtain the CPU time, unknown is displayed as in the case of [Sys: unknown].; When the -XX:-HitachiVerboseGCCpuTime option is specified, the information is not output.

jvm_alloc_size: Specifies the size of the area currently in use, from the areas being managed in JavaVM (size of the area currently in use, from the total size of mmap_total_size and malloc_total_size).; When the -XX:HitachiVerboseGCPrintJVMInternalMemory option is specified, this information is not output.

mmap_total_size: Specifies the total C heap size allocated for mmap (VirtualAlloc in Windows), from the areas being managed in JavaVM.; When the -XX:-HitachiVerboseGCPrintJVMInternalMemory option is specified, this information is not output.

malloc_total_size: Specifies the total C heap size allocated for malloc, from the areas being managed in JavaVM.; When the -XX:-HitachiVerboseGCPrintJVMInternalMemory option is specified, this information is not output.

thread_count: Specifies the number of Java threads.; When the -XX:-HitachiVerboseGCPrintThreadCount option is specified, this information is not output.

doe_alloc_size: Specifies the cumulative heap size allocated by invoking the java.io.File.deleteOnExit()method.; When the -XX:-HitachiVerboseGCPrintDeleteOnExit option is specified, this information is not output.

called_count: Specifies the invocation count of the java.io.File.deleteOnExit() method.; When the -XX:-HitachiVerboseGCPrintDeleteOnExit option is specified, this information is not output.

cc_used_size: Specifies the size of the code cache area used when the garbage collection occurs. The unit is kilobyte.; When the -XX:-PrintCodeCacheInfo option is specified, this information is not output.

cc_max_size: Specifies the maximum size of the code cache area. The unit is kilobyte.; When the -XX:-PrintCodeCacheInfo option is specified, this information is not output.

cc_info: Specifies the maintenance information.; When the -XX:-PrintCodeCacheInfo option is specified, this information is not output.