7.6.5 -XX:[+|-]HitachiVerboseGCPrintCause
-XX:[+|-]HitachiVerboseGCPrintCause outputs details on the causes of GC.
Description
-XX:[+|-]HitachiVerboseGCPrintCause specifies whether details on the causes of GC are to be output.
- Prerequisite option
-
-
-XX:+HitachiVerboseGC
-
If the -XX:+HitachiCommaVerboseGC option is specified, the following cause numbers are output.
|
Cause number |
Cause content |
Description |
GC type |
|
|---|---|---|---|---|
|
Other than G1GC |
G1GC |
|||
|
0 |
ObjAllocFail |
GC occurred because the object area could not be allocated. |
Y |
Y |
|
1 |
System.gc |
GC occurred because the java.lang.System.gc method was called. |
Y |
Y |
|
3 |
DelayedGC |
GC that was suspended by JNI or JVMTI was started. |
Y |
Y |
|
4 |
JavaGCCommand |
GC occurred due to the javagc command. |
Y |
Y |
|
6 |
JHeapProfCommand |
GC occurred due to the jheapprof command. |
Y |
N |
|
8 |
EMReclaimFail |
Because objects were moved to the Java heap due to explicit release of Explicit memory, the Java heap overflowed. |
Y |
N |
|
9 |
EMMigrateFail |
Because objects were moved to the Java heap due to automatic release of Explicit memory, the Java heap overflowed. |
Y |
N |
|
10 |
JVMTIForceGC |
GC occurred due to the JVMTI function ForceGarbageCollection(). |
Y |
Y |
|
11 |
PromotionFail |
GC occurred due to a CopyGC promotion failure. |
Y |
N |
|
12 |
EMJavaGCCommand |
GC occurred because an Explicit memory block was released by the javagc command. |
Y |
Y |
|
13 |
EHeapProfCommand |
GC occurred due to the eheapprof command. |
Y |
Y |
|
14 |
G1HumAllocFail |
When G1GC was used, GC occurred because a Humongous area was allocated. |
N |
Y |
|
15 |
G1EvacuationPause |
An evacuation occurred when G1GC was used. |
N |
Y |
|
16 |
Concurrent Marking |
No GC occurred but the Concurrent Marking processing, which stops and executes applications, was logged. |
N |
Y |
|
17 |
EvacuationFail |
When G1GC was used, GC occurred due to an evacuation failure. |
N |
Y |
|
18 |
MetaspaceAllocFail |
GC occurred because the Metaspace area could not be allocated. |
Y |
Y |
|
19 |
LastMetaspaceGC |
The last GC occurred before a Metaspace OutOfMemory error occurred. |
Y |
Y |
- Legend:
-
Y: Output.
N: Not output.
Syntax
-XX:[+|-]HitachiVerboseGCPrintCause
Specifiable values
Type: String
- -XX:+HitachiVerboseGCPrintCause
-
Outputs details on the causes of GC at the end of the extended verbosegc information.
- -XX:-HitachiVerboseGCPrintCause
-
Outputs the extended verbosegc information in the normal format.
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
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