G1 (java 8) Full GC's not shown in CSV export

[maiergre]

When exporting to CSV format, Full GC runs are not shown in the log file. They are present when exporting to SIMPLE. This is using Java 8 with G1GC.

SIMPLE:

YoungGC 97951.577000 0.004314
YoungGC 97951.584000 0.003936
FullGC 97951.591000 31.384688
YoungGC 97983.548000 0.101593

CSV:

97951.5800636,10477568,10485760,0.0039364,GC pause (G1 Evacuation Pause) (young)
97951.584,10477568,10485760,0,NONE
97983.4464066,9087693,10485760,0.1015934,GC pause (G1 Evacuation Pause) (young)
97983.548,7690752,10485760,0,NONE

[chewiebug]

Hi Gregor,

You are right, full GCs are missing from the CSV export format.

Uhm, maybe a strange question coming from my side: How do you use the CSV format? I have never really understood, why two lines are written for one compared to the SIMPLE format.

Best regards, Jörg

[maiergre]

Sorry for the late reply. I haven't actually really started using the CSV output yet. I can't use SIMPLE because I'm interested in heap occupancy before and after the collection. The two lines in CSV aren't ideal though. Ideally, everything would be in a single line. Actually, I'd really like to see even more data (all in single line) :-). Everything that's in this input line:

[Eden: 480.0M(480.0M)->0.0B(2780.0M) Survivors: 32.0M->32.0M Heap: 6953.3M(10.0G)->6393.4M(10.0G)]

[chewiebug]

I think, currently, there is indeed no export format that exactly meets your requirements. It should be rather easy to implement it, though - would you like to give it a try?

Out of curiosity: What are you trying to achieve exporting the data to csv? Some kind of post processing?