Hello Roy, here you find something about the G1 Evacuation Pause (full young mode)
https://plumbr.io/handbook/garbage-collection-algorithms-implementations/g1/evacuation-pause-fully-young This in addition to the meta space resizing Thomas described. Gruss Bernd -- http://bernd.eckenfels.net ________________________________ Von: hotspot-gc-use <hotspot-gc-use-boun...@openjdk.java.net> im Auftrag von Thomas Schatzl <thomas.scha...@oracle.com> Gesendet: Donnerstag, Januar 30, 2020 5:36 PM An: hotspot-gc-use@openjdk.java.net Betreff: Re: When will G1 GC trigger initial-mark besides IHOP Hi, On 30.01.20 16:51, Roy Zhang wrote: > Dear JVM experts, > > I set -XX:InitiatingHeapOccupancyPercent=70 in JDK8 (no adaptive IHOP > feature), but I found there are two initial-mark phase at the beginning > of JVM start when HeapOccupancyPercent is far less than 70%, is there > any other factor which will trigger G1 GC initial mark phase? Thanks in > advance! > > *Excerpt of GC log:* > 2020-01-22T03:58:14.227+0000: 3.158: [GC pause (Metadata GC Threshold) > (young) (initial-mark), 0.1583711 secs] > [Eden: 1056.0M(81920.0M)->0.0B(81184.0M) Survivors: 0.0B->736.0M Heap: > 1472.0M(160.0G)->1179.5M(160.0G)] > 2020-01-22T04:13:07.073+0000: 896.004: [GC pause (G1 Evacuation Pause) > (young) (initial-mark), 3.8512514 secs] > [Eden: 81184.0M(81184.0M)->0.0B(71904.0M) Survivors: 736.0M->10016.0M > Heap: 83643.5M(160.0G)->11744.0M(160.0G)] > the log message before the "initial mark" gc tells you - when the Metaspace is about to get full to try to unload data in it (e.g. Class data). I.e. the condition is either: - Java heap gets too full - Metaspace gets too full Thanks, Thomas _______________________________________________ hotspot-gc-use mailing list hotspot-gc-use@openjdk.java.net https://mail.openjdk.java.net/mailman/listinfo/hotspot-gc-use
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