7.6.8 -XX:[+|-]HitachiVerboseGCPrintJVMInternalMemory

-XX:[+|-]HitachiVerboseGCPrintJVMInternalMemory outputs the heap information that is managed in Java VM, to the Java VM log file.

Description

-XX:[+|-]HitachiVerboseGCPrintJVMInternalMemory specifies whether the heap information that is managed in Java VM is to be output to the Java VM log file.

Of the C heap areas, the heap areas obtained by using the following two methods are managed in Java VM.

C heap areas obtained by using mmap
C heap areas obtained by using malloc

If the -XX:+HitachiVerboseGCPrintJVMInternalMemory option is enabled, the following information can be output: total C heap size obtained by using mmap (mmap_total_size) and the total C heap size obtained by using malloc (malloc_total_size). Of these allocated areas, the total size of the area in use (jvm_alloc_size) can also be output.

Prerequisite option

-XX:+HitachiVerboseGC

Format of 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][Metaspace: Metaspace_info]
[class space: class_space_info][cause:cause_info] [User: user_cpu secs]
[Sys: system_cpu secs][IM: jvm_alloc_size, mmap_total_size, malloc_total_size]

The following provides details about the output items and content when this option is specified.

Output item	Output content
`jvm_alloc_size`	Of the total size of the areas managed in Java VM (the sum of `mmap_total_size` and `malloc_total_size`), the size of the area that is currently in use
`mmap_total_size`	Of the areas managed in Java VM, the total C heap size allocated by VirtualAlloc
`malloc_total_size`	Of the areas managed in Java VM, the total C heap size allocated by malloc

Syntax

-XX:[+|-]HitachiVerboseGCPrintJVMInternalMemory

Specifiable values

Type: String

-XX:+HitachiVerboseGCPrintJVMInternalMemory: Outputs the heap information that is managed in Java VM, to the Java VM log file.
-XX:-HitachiVerboseGCPrintJVMInternalMemory: Does not output the heap information that is managed in Java VM, to the Java VM log file.

Default value

If the definition item is omitted:: -XX:+HitachiVerboseGCPrintJVMInternalMemory

Examples

Example 1 (if SerialGC is selected when the -XX:+HitachiVerboseGC option is selected)

[VGC]<Thu Oct 02 10:38:53.658 2014>(Skip Full:1,Copy:0)
[Full GC 770K->682K(8064K), 0.0050003 secs][DefNew::Eden: 88K->0K(2304K)]
[DefNew::Survivor: 0K->0K(256K)][Tenured: 681K->682K(5504K)] 
[Metaspace: 3634K(4492K, 4492K)->3634K(4492K, 4492K)]
[class space: 356K(388K, 388K)->356K(388K, 388K)] 
[cause:System.gc][User: 0.0000000 secs][Sys: 0.0000000 secs]
[IM: 11944K, 12448K, 0K][TC: 22][DOE: 0K, 0][CCI: 1173K, 245760K, 2496K]

Example 2 (if G1GC is selected when the -XX:+HitachiVerboseGC option is selected)

GC-related log

[VG1]<Thu Oct 02 10:38:56.193 2014>
[Full GC 753K/2048K(8192K)->678K/1024K(8192K), 0.0097901 secs][Status:-]
[G1GC::Eden: 1024K(2048K)->0K(2048K)][G1GC::Survivor: 0K->0K]
[G1GC::Tenured: 1024K->1024K][G1GC::Humongous: 0K->0K]
[G1GC::Free: 6144K->7168K] [Metaspace: 3634K(4492K, 4492K)->3634K(4492K, 4492K)]
[class space: 356K(388K, 388K)->356K(388K, 388K)] [cause:System.gc]
[RegionSize: 1024K][Target: 0.2000000 secs][Predicted: 0.0000000 secs]
[TargetTenured: 0K][Reclaimable: 0K(0.00%)][User: 0.0000000 secs]
[Sys: 0.0000000 secs][IM: 20459K, 21920K, 0K][TC: 35][DOE: 0K, 0]
[CCI: 1172K, 245760K, 2496K]

Concurrent Marking related log

[VCM]<Wed Jul 24 11:45:20 2013>[Concurrent Root Region Scan Start]
[User: 0.0000000 secs][Sys: 0.0000000 secs]
[VCM]<Wed Jul 24 11:45:20 2013>[Concurrent Root Region Scan End]
[User: 0.0126134 secs][Sys: 0.0146961 secs]
[VCM]<Wed Jul 24 11:45:20 2013>[Concurrent Mark Start][User: 0.0000000 secs]
[Sys: 0.0000000 secs]
[VCM]<Wed Jul 24 11:45:34 2013>[Concurrent Mark End][User: 0.0156250 secs]
[Sys: 0.2495800 secs]

Example 3 (if SerialGC is selected when the -XX:+HitachiCommaVerboseGC option is selected)

VGC,Thu Oct 02 10:38:52.442 2014,1,0,0,Full GC,770,682,8064,0.0040002,88,0,2304,
0,0,256,681,682,5504,3634,3634,4492,3634,3634,4492,356,356,388,356,356,388,1,0.
0000000,0.0000000,11913,12448,0,22,0,0,1173,245760,2496

Example 4 (if G1GC is selected when the -XX:+HitachiCommaVerboseGC option is selected)

GC-related log

VG1,Thu Oct 02 10:38:54.920 2014,Full GC,753,2048,8192,678,1024,8192,0.0064767,
-,1024,2048,0,2048,0,0,1024,1024,0,0,6144,7168,3634,3634,4492,3634,3634,4492,
356,356,388,356,356,388,1,1024,0.2000000,0.0000000,0,0,0.00,0.0000000,
0.0000000,20459,21920,0,35,0,0,1171,245760,2496

Concurrent Marking related log

VCM,Fri Jul 26 21:35:50 2013,Concurrent Mark Start,0.0000000,0.0000000
VCM,Fri Jul 26 21:35:50 2013,Concurrent Mark End,0.0124532,0.0245698

Notes

To enable this option, you must also enable the extended VerboseGC functionality and the original memory management functionality.

To Page Top