hotspot-gc-use Digest, Vol 40, Issue 4

[Alex Aisinzon]

Stefan

I have had similar experience with G1 and reported it here.
I tried the option to try to limit GC pauses (-XX:MaxGCPauseMillis with
1s and then 2s). It did not improve things.
I am happy to try anything else to help improve G1.

Alex A

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Subject: hotspot-gc-use Digest, Vol 40, Issue 4

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Today's Topics:

   1. G1GC: many consecutive full gcs (Stefan Wachter)


----------------------------------------------------------------------

Message: 1
Date: Thu, 16 Jun 2011 09:23:05 +0200
From: Stefan Wachter <Stefan.Wachter at gmx.de>
Subject: G1GC: many consecutive full gcs
To: hotspot-gc-use at openjdk.java.net
Message-ID: <4DF9AF59.90708 at gmx.de>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Hi all,

the G1GC runs nicely for some time but then it starts to have bursts of 
consecutive full gcs (see log below). Can anyone explain that behaviour?

The JVM is stared with these options:

-Xmx10000M
-Xms1024M
-XX:MaxPermSize=1024m
-XX:+UseG1GC
-XX:MaxGCPauseMillis=2000
-XX:GCPauseIntervalMillis=10000

--Stefan


31314.569: [GC pause (young) 3286M->3234M(8937M), 0.0485530 secs]
31374.932: [GC pause (young) 3279M->3236M(8937M), 0.0486560 secs]
31837.688: [GC pause (young) 4614M->3252M(8937M), 0.0739370 secs]
33528.784: [GC pause (young) 5997M->3330M(8937M), 0.1543940 secs]
35372.029: [GC pause (young) 6038M->3405M(8937M), 0.2364930 secs]
36508.343: [Full GC 8525M->2903M(9678M), 8.9121160 secs]
38204.291: [Full GC 8647M->2295M(10000M), 7.4105940 secs]
39038.017: [Full GC 8790M->2092M(6975M), 6.7242110 secs]
39047.736: [Full GC 8996M->2089M(9998M), 6.0741630 secs]
39095.551: [Full GC 8936M->2090M(6969M), 5.5573390 secs]
39104.326: [Full GC 9175M->2092M(9997M), 5.3413860 secs]
39112.760: [Full GC 9392M->2094M(9978M), 5.4884150 secs]
41965.304: [Full GC 9549M->2112M(7043M), 6.4774550 secs]
43830.656: [GC pause (young) 4615M->2309M(7043M), 0.1727720 secs]
46024.398: [GC pause (young) 4638M->2497M(7043M), 0.3039900 secs]
46068.009: [Full GC 8832M->2237M(10000M), 6.6717340 secs]
46077.691: [Full GC 9322M->2187M(9987M), 5.8603570 secs]
46086.731: [Full GC 9487M->2189M(9996M), 5.8521360 secs]
46124.713: [Full GC 8792M->2185M(9895M), 5.7782260 secs]
46133.366: [Full GC 9297M->2188M(9999M), 5.7263360 secs]
46142.238: [Full GC 9509M->2189M(9985M), 5.5704850 secs]
47454.530: [Full GC 9676M->2295M(7653M), 7.3169840 secs]
48163.422: [GC pause (young) 4937M->2431M(7653M), 0.2379570 secs]
48887.388: [GC pause (young) 5007M->2497M(7653M), 0.1999790 secs]



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End of hotspot-gc-use Digest, Vol 40, Issue 4
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