Strange parsing issue concerning G1 collector

[YouriAndropov]

Hi,

First of all, it would be great if gcviewer could ignore the "G1Ergonomics" messages from the -XX:+PrintAdaptiveSizePolicy setting.

Second, I do have a strange bug while parsing gc log files.

This one works fine :

2015-02-13T17:12:01.182+0100: 195,970: Total time for which application threads were stopped: 0,0001000 seconds
2015-02-13T17:12:01.265+0100: 196,053: [GC pause (G1 Evacuation Pause) (young)
Desired survivor size 20447232 bytes, new threshold 15 (max 15)

• age 1: 503304 bytes, 503304 total
• age 2: 43928 bytes, 547232 total
  , 0,0331820 secs]
  [Parallel Time: 22,5 ms, GC Workers: 4]
  [GC Worker Start (ms): Min: 196053,3, Avg: 196053,3, Max: 196053,4, Diff: 0,1]
  [Ext Root Scanning (ms): Min: 11,0, Avg: 11,5, Max: 12,1, Diff: 1,1, Sum: 46,1]
  [Update RS (ms): Min: 0,6, Avg: 1,1, Max: 1,5, Diff: 0,9, Sum: 4,3]
  [Processed Buffers: Min: 12, Avg: 19,0, Max: 30, Diff: 18, Sum: 76]
  [Scan RS (ms): Min: 0,9, Avg: 1,0, Max: 1,0, Diff: 0,1, Sum: 3,8]
  [Code Root Scanning (ms): Min: 0,0, Avg: 0,0, Max: 0,1, Diff: 0,0, Sum: 0,1]
  [Object Copy (ms): Min: 8,4, Avg: 8,7, Max: 8,9, Diff: 0,5, Sum: 34,9]
  [Termination (ms): Min: 0,0, Avg: 0,0, Max: 0,0, Diff: 0,0, Sum: 0,0]
  [GC Worker Other (ms): Min: 0,0, Avg: 0,0, Max: 0,0, Diff: 0,0, Sum: 0,1]
  [GC Worker Total (ms): Min: 22,3, Avg: 22,4, Max: 22,4, Diff: 0,1, Sum: 89,4]
  [GC Worker End (ms): Min: 196075,7, Avg: 196075,7, Max: 196075,7, Diff: 0,0]
  [Code Root Fixup: 0,0 ms]
  [Code Root Migration: 0,1 ms]
  [Clear CT: 0,5 ms]
  [Other: 10,1 ms]
  [Choose CSet: 0,0 ms]
  [Ref Proc: 8,6 ms]
  [Ref Enq: 0,2 ms]
  [Free CSet: 1,0 ms]
  [Eden: 304,0M(304,0M)->0,0B(279,0M) Survivors: 3072,0K->28,0M Heap: 418,0M(512,0M)->139,3M(512,0M)]
  [Times: user=0,09 sys=0,00, real=0,03 secs]
  2015-02-13T17:12:01.299+0100: 196,087: Total time for which application threads were stopped: 0,0338710 seconds

But, this one doesn't work :

2015-02-13T17:12:01.196+0100: 195,854: Total time for which application threads were stopped: 0,0000890 seconds
2015-02-13T17:12:01.729+0100: 196,388: [GC pause (G1 Evacuation Pause) (young)
Desired survivor size 20447232 bytes, new threshold 15 (max 15)

• age 1: 6700576 bytes, 6700576 total
• age 2: 10504568 bytes, 17205144 total
• age 3: 320040 bytes, 17525184 total
• age 4: 92336 bytes, 17617520 total
  , 0,0608680 secs]
  [Parallel Time: 48,4 ms, GC Workers: 4]
  [GC Worker Start (ms): Min: 196388,7, Avg: 196390,4, Max: 196394,8, Diff: 6,1]
  [Ext Root Scanning (ms): Min: 14,1, Avg: 16,5, Max: 20,1, Diff: 6,0, Sum: 66,0]
  [Update RS (ms): Min: 0,0, Avg: 0,6, Max: 2,2, Diff: 2,2, Sum: 2,2]
  [Processed Buffers: Min: 0, Avg: 20,8, Max: 83, Diff: 83, Sum: 83]
  [Scan RS (ms): Min: 0,3, Avg: 1,4, Max: 2,5, Diff: 2,2, Sum: 5,7]
  [Code Root Scanning (ms): Min: 0,0, Avg: 0,1, Max: 0,1, Diff: 0,1, Sum: 0,2]
  [Object Copy (ms): Min: 26,6, Avg: 27,4, Max: 28,5, Diff: 1,9, Sum: 109,6]
  [Termination (ms): Min: 0,0, Avg: 0,0, Max: 0,0, Diff: 0,0, Sum: 0,1]
  [GC Worker Other (ms): Min: 0,0, Avg: 0,0, Max: 0,1, Diff: 0,0, Sum: 0,2]
  [GC Worker Total (ms): Min: 41,6, Avg: 46,0, Max: 47,8, Diff: 6,2, Sum: 183,9]
  [GC Worker End (ms): Min: 196436,4, Avg: 196436,4, Max: 196436,4, Diff: 0,0]
  [Code Root Fixup: 0,1 ms]
  [Code Root Migration: 0,2 ms]
  [Clear CT: 0,3 ms]
  [Other: 11,8 ms]
  [Choose CSet: 0,0 ms]
  [Ref Proc: 10,5 ms]
  [Ref Enq: 0,3 ms]
  [Free CSet: 0,7 ms]
  [Eden: 281,0M(281,0M)->0,0B(180,0M) Survivors: 26,0M->39,0M Heap: 398,8M(512,0M)->138,5M(512,0M)]
  [Times: user=0,20 sys=0,00, real=0,06 secs]
  2015-02-13T17:12:01.791+0100: 196,450: Total time for which application threads were stopped: 0,0624330 seconds

I couldn't see any structural difference between these two samples.
Here are the error messages:

AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.ParseException: Error parsing entry (java.lang.ArrayIndexOutOfBoundsException) Line 245: 2015-02-13T17:12:01.729+0100: 196,388: [GC pause (G1 Evacuation Pause) (young)
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: '' Line 251: , 0,0608680 secs]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Parallel Time' Line 252: [Parallel Time: 48,4 ms, GC Workers: 4]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'GC Worker Start (ms)' Line 253: [GC Worker Start (ms): Min: 196388,7, Avg: 196390,4, Max: 196394,8, Diff: 6,1]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Ext Root Scanning (ms)' Line 254: [Ext Root Scanning (ms): Min: 14,1, Avg: 16,5, Max: 20,1, Diff: 6,0, Sum: 66,0]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Update RS (ms)' Line 255: [Update RS (ms): Min: 0,0, Avg: 0,6, Max: 2,2, Diff: 2,2, Sum: 2,2]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Processed Buffers' Line 256: [Processed Buffers: Min: 0, Avg: 20,8, Max: 83, Diff: 83, Sum: 83]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Scan RS (ms)' Line 257: [Scan RS (ms): Min: 0,3, Avg: 1,4, Max: 2,5, Diff: 2,2, Sum: 5,7]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Code Root Scanning (ms)' Line 258: [Code Root Scanning (ms): Min: 0,0, Avg: 0,1, Max: 0,1, Diff: 0,1, Sum: 0,2]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Object Copy (ms)' Line 259: [Object Copy (ms): Min: 26,6, Avg: 27,4, Max: 28,5, Diff: 1,9, Sum: 109,6]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Termination (ms)' Line 260: [Termination (ms): Min: 0,0, Avg: 0,0, Max: 0,0, Diff: 0,0, Sum: 0,1]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'GC Worker Other (ms)' Line 261: [GC Worker Other (ms): Min: 0,0, Avg: 0,0, Max: 0,1, Diff: 0,0, Sum: 0,2]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'GC Worker Total (ms)' Line 262: [GC Worker Total (ms): Min: 41,6, Avg: 46,0, Max: 47,8, Diff: 6,2, Sum: 183,9]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'GC Worker End (ms)' Line 263: [GC Worker End (ms): Min: 196436,4, Avg: 196436,4, Max: 196436,4, Diff: 0,0]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Code Root Fixup' Line 264: [Code Root Fixup: 0,1 ms]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Code Root Migration' Line 265: [Code Root Migration: 0,2 ms]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Clear CT' Line 266: [Clear CT: 0,3 ms]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Other' Line 267: [Other: 11,8 ms]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Choose CSet' Line 268: [Choose CSet: 0,0 ms]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Ref Proc' Line 269: [Ref Proc: 10,5 ms]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Ref Enq' Line 270: [Ref Enq: 0,3 ms]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Free CSet' Line 271: [Free CSet: 0,7 ms]

Any clue ?

[chewiebug]

What version of gcviewer are you using? G1ergonomics should be ignored by the latest version. As far as the other problem is concerned, I'll have to look into the details.

-------- Original Message --------
From: YouriAndropov notifications@github.com
Sent: February 16, 2015 3:41:03 PM CET
To: chewiebug/GCViewer GCViewer@noreply.github.com
Subject: [GCViewer] Strange parsing issue concerning G1 collector (#128)

Hi,

First of all, it would be great if gcviewer could ignore the "G1Ergonomics" messages from the -XX:+PrintAdaptiveSizePolicy setting.

Second, I do have a strange bug while parsing gc log files.

This one works fine :

2015-02-13T17:12:01.182+0100: 195,970: Total time for which application threads were stopped: 0,0001000 seconds
2015-02-13T17:12:01.265+0100: 196,053: [GC pause (G1 Evacuation Pause) (young)
Desired survivor size 20447232 bytes, new threshold 15 (max 15)

• age 1: 503304 bytes, 503304 total
• age 2: 43928 bytes, 547232 total
  , 0,0331820 secs]
  [Parallel Time: 22,5 ms, GC Workers: 4]
  [GC Worker Start (ms): Min: 196053,3, Avg: 196053,3, Max: 196053,4, Diff: 0,1]
  [Ext Root Scanning (ms): Min: 11,0, Avg: 11,5, Max: 12,1, Diff: 1,1, Sum: 46,1]
  [Update RS (ms): Min: 0,6, Avg: 1,1, Max: 1,5, Diff: 0,9, Sum: 4,3]
  [Processed Buffers: Min: 12, Avg: 19,0, Max: 30, Diff: 18, Sum: 76]
  [Scan RS (ms): Min: 0,9, Avg: 1,0, Max: 1,0, Diff: 0,1, Sum: 3,8]
  [Code Root Scanning (ms): Min: 0,0, Avg: 0,0, Max: 0,1, Diff: 0,0, Sum: 0,1]
  [Object Copy (ms): Min: 8,4, Avg: 8,7, Max: 8,9, Diff: 0,5, Sum: 34,9]
  [Termination (ms): Min: 0,0, Avg: 0,0, Max: 0,0, Diff: 0,0, Sum: 0,0]
  [GC Worker Other (ms): Min: 0,0, Avg: 0,0, Max: 0,0, Diff: 0,0, Sum: 0,1]
  [GC Worker Total (ms): Min: 22,3, Avg: 22,4, Max: 22,4, Diff: 0,1, Sum: 89,4]
  [GC Worker End (ms): Min: 196075,7, Avg: 196075,7, Max: 196075,7, Diff: 0,0]
  [Code Root Fixup: 0,0 ms]
  [Code Root Migration: 0,1 ms]
  [Clear CT: 0,5 ms]
  [Other: 10,1 ms]
  [Choose CSet: 0,0 ms]
  [Ref Proc: 8,6 ms]
  [Ref Enq: 0,2 ms]
  [Free CSet: 1,0 ms]
  [Eden: 304,0M(304,0M)->0,0B(279,0M) Survivors: 3072,0K->28,0M Heap: 418,0M(512,0M)->139,3M(512,0M)]
  [Times: user=0,09 sys=0,00, real=0,03 secs]
  2015-02-13T17:12:01.299+0100: 196,087: Total time for which application threads were stopped: 0,0338710 seconds

But, this one doesn't work :

2015-02-13T17:12:01.729+0100: 196,388: [GC pause (G1 Evacuation Pause) (young)
Desired survivor size 20447232 bytes, new threshold 15 (max 15)

• age 1: 6700576 bytes, 6700576 total
• age 2: 10504568 bytes, 17205144 total
• age 3: 320040 bytes, 17525184 total
• age 4: 92336 bytes, 17617520 total
  , 0,0608680 secs]
  [Parallel Time: 48,4 ms, GC Workers: 4]
  [GC Worker Start (ms): Min: 196388,7, Avg: 196390,4, Max: 196394,8, Diff: 6,1]
  [Ext Root Scanning (ms): Min: 14,1, Avg: 16,5, Max: 20,1, Diff: 6,0, Sum: 66,0]
  [Update RS (ms): Min: 0,0, Avg: 0,6, Max: 2,2, Diff: 2,2, Sum: 2,2]
  [Processed Buffers: Min: 0, Avg: 20,8, Max: 83, Diff: 83, Sum: 83]
  [Scan RS (ms): Min: 0,3, Avg: 1,4, Max: 2,5, Diff: 2,2, Sum: 5,7]
  [Code Root Scanning (ms): Min: 0,0, Avg: 0,1, Max: 0,1, Diff: 0,1, Sum: 0,2]
  [Object Copy (ms): Min: 26,6, Avg: 27,4, Max: 28,5, Diff: 1,9, Sum: 109,6]
  [Termination (ms): Min: 0,0, Avg: 0,0, Max: 0,0, Diff: 0,0, Sum: 0,1]
  [GC Worker Other (ms): Min: 0,0, Avg: 0,0, Max: 0,1, Diff: 0,0, Sum: 0,2]
  [GC Worker Total (ms): Min: 41,6, Avg: 46,0, Max: 47,8, Diff: 6,2, Sum: 183,9]
  [GC Worker End (ms): Min: 196436,4, Avg: 196436,4, Max: 196436,4, Diff: 0,0]
  [Code Root Fixup: 0,1 ms]
  [Code Root Migration: 0,2 ms]
  [Clear CT: 0,3 ms]
  [Other: 11,8 ms]
  [Choose CSet: 0,0 ms]
  [Ref Proc: 10,5 ms]
  [Ref Enq: 0,3 ms]
  [Free CSet: 0,7 ms]
  [Eden: 281,0M(281,0M)->0,0B(180,0M) Survivors: 26,0M->39,0M Heap: 398,8M(512,0M)->138,5M(512,0M)]
  [Times: user=0,20 sys=0,00, real=0,06 secs]
  2015-02-13T17:12:01.791+0100: 196,450: Total time for which application threads were stopped: 0,0624330 seconds

I couldn't see any structural difference between these two samples.
Here are the error messages:

AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.ParseException: Error parsing entry (java.lang.ArrayIndexOutOfBoundsException) Line 245: 2015-02-13T17:12:01.729+0100: 196,388: [GC pause (G1 Evacuation Pause) (young)
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: '' Line 251: , 0,0608680 secs]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Parallel Time' Line 252: [Parallel Time: 48,4 ms, GC Workers: 4]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'GC Worker Start (ms)' Line 253: [GC Worker Start (ms): Min: 196388,7, Avg: 196390,4, Max: 196394,8, Diff: 6,1]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Ext Root Scanning (ms)' Line 254: [Ext Root Scanning (ms): Min: 14,1, Avg: 16,5, Max: 20,1, Diff: 6,0, Sum: 66,0]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Update RS (ms)' Line 255: [Update RS (ms): Min: 0,0, Avg: 0,6, Max: 2,2, Diff: 2,2, Sum: 2,2]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Processed Buffers' Line 256: [Processed Buffers: Min: 0, Avg: 20,8, Max: 83, Diff: 83, Sum: 83]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Scan RS (ms)' Line 257: [Scan RS (ms): Min: 0,3, Avg: 1,4, Max: 2,5, Diff: 2,2, Sum: 5,7]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Code Root Scanning (ms)' Line 258: [Code Root Scanning (ms): Min: 0,0, Avg: 0,1, Max: 0,1, Diff: 0,1, Sum: 0,2]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Object Copy (ms)' Line 259: [Object Copy (ms): Min: 26,6, Avg: 27,4, Max: 28,5, Diff: 1,9, Sum: 109,6]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Termination (ms)' Line 260: [Termination (ms): Min: 0,0, Avg: 0,0, Max: 0,0, Diff: 0,0, Sum: 0,1]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'GC Worker Other (ms)' Line 261: [GC Worker Other (ms): Min: 0,0, Avg: 0,0, Max: 0,1, Diff: 0,0, Sum: 0,2]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'GC Worker Total (ms)' Line 262: [GC Worker Total (ms): Min: 41,6, Avg: 46,0, Max: 47,8, Diff: 6,2, Sum: 183,9]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'GC Worker End (ms)' Line 263: [GC Worker End (ms): Min: 196436,4, Avg: 196436,4, Max: 196436,4, Diff: 0,0]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Code Root Fixup' Line 264: [Code Root Fixup: 0,1 ms]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Code Root Migration' Line 265: [Code Root Migration: 0,2 ms]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Clear CT' Line 266: [Clear CT: 0,3 ms]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Other' Line 267: [Other: 11,8 ms]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Choose CSet' Line 268: [Choose CSet: 0,0 ms]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Ref Proc' Line 269: [Ref Proc: 10,5 ms]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Ref Enq' Line 270: [Ref Enq: 0,3 ms]
AVERTISSEMENT [DataReaderSun1_6_0]: com.tagtraum.perf.gcviewer.imp.UnknownGcTypeException: Unknown gc type: 'Free CSet' Line 271: [Free CSet: 0,7 ms]

Any clue ?

---

Reply to this email directly or view it on GitHub:
#128

[YouriAndropov]

The latest version has this issue (1.34.1) but also the previous one (1.34)

[chewiebug]

Hi Youri, I can't reproduce the issue with the samples you posted. Both parse without any warnings. Could you please send the (compressed) original log file to gcviewer-info@googlegroups.com? Best regards, Jörg

[YouriAndropov]

I had to use hotspot JVM 1.8 with GCviewer 1.34.1. Could it be related to this issue?
I'll send the logs tomorrow.

[YouriAndropov]

I've sent you a new log not working.
I think there are some regressions with latest versions of GCviewer, 1.34.1 cannot work with java 1.7 and has parsing issues on more files than the previous version.

[chewiebug]

I've received a log file via gcviewer-info mailinglist with a sender
named "Frédéric Girard". Is that the one you sent?

Concerning GCViewer and java 1.7 please read the release notes
https://github.com/chewiebug/GCViewer/wiki/Changelog#gcviewer-1341---31012015-changes-since-134
(there was a switch to java 8).

If you have examples for those parsing issues you mention, please send
them. I have a unittest suite, that always is run before releases. It
may be, that some tests are missing.

[chewiebug]

Hi Frederic, The problem is, that GCViewer fails to detect for this particular file, that it is a G1 gc log. It tries to parse it as a CMS log, that's where alle the warnings come from. As a workaround, you can delete the first (few) lines of your log. Then recognition and parsing will work. I am working on a fix to recognise the original file correctly. Best regards, Jörg

[YouriAndropov]

Yes that was me.
The gc log is already "cut" to a particular event, I cannot remove any lines without affecting values like total pause, throughput etc.
Surprisingly, the detection works often, but not always. Could I add a header to help the detection work ?

[chewiebug]

For recognition of the log type, GCViewer reads the first 4 KB of a file and tries to find a pattern, allowing it to decide on the type (for the details see https://github.com/chewiebug/GCViewer/blob/develop/src/main/java/com/tagtraum/perf/gcviewer/imp/DataReaderFactory.java#L92).

There was a bug, that sometimes resulted in a wrong decision. I have fixed it for your current sample file. Recognition should generally improve now, also for manually cut files.

If it still doesn't recognise correctly, you may add " (young)" (without quotes) as the first line in a G1 log file. Then it should always be recognised as such.

I'd be interested in the first few lines of other files, that can't be recognised, however - maybe I can further improve recognition.

Actually, you are waiting for #5, right?

[chewiebug]

I have uploaded the improved version (1.35-SNAPSHOT - see Changelog). Does it work better for your files?

[YouriAndropov]

I'll try it as soon as sourceforge downloads are back ... Or maybe the download link is broken ?
The feature request #5 seems very useful indeed !