<!DOCTYPE html><html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
Hi, <br>
<br>
A quick look at the GCeasy pages show that the old-generation start
to increase right before the FullGCs. This is likely caused by an
increase in allocation rate (likely caused higher load on the
application or a change in behavior) which lead to more frequent GCs
and objects getting promoted to the old generation quicker.<br>
<br>
Without the complete logs, its hard to say exactly what tuning could
or should be done. We already seem to run the concurrent marking
quite frequently, but lowering the InitiatingHeapOccupancyPercent
could perhaps help avoid the Full GCs. You also seem to have some
GCs caused by humongous allocations around the Full GCs, depending
on how big those objects are increasing the G1 regions size could
possibly help. Looking at your heap size the default region size
should be 4m, so increasing it to 8m could help: -XX:<span class="Box-sc-g0xbh4-0 fzSFmK prc-Text-Text-0ima0">G1HeapRegionSize=8m.<br>
<br>
If you don't have the complete logs easy available, you can
collect them into a separate file using -Xloggc:<filename>.<br>
<br>
Hope this helps,<br>
Stefan<br>
<br>
</span><br>
<div class="moz-cite-prefix">On 2024-11-21 02:20, Mohammed wrote:<br>
</div>
<blockquote type="cite" cite="mid:CAOj4pqCYqcEgAJpJd5drtxhSxJbviDTNVtQZ=k3DiLkBXSWyiQ@mail.gmail.com">
<div dir="auto">
<div dir="auto" style="font-size:12.8px">Dear GC Community,</div>
<div dir="auto" style="font-size:12.8px"><br>
I hope this message finds you well... I'm currently
experiencing performance issues related to very long garbage
collection (GC) pauses in our application, which uses the G1
on Java 8.</div>
<div dir="auto" style="font-size:12.8px"><br>
</div>
<div dir="auto" style="font-size:12.8px"><a href="https://gceasy.io/my-gc-report.jsp?p=YXJjaGl2ZWQvMjAyNC8xMS8xOC9qYXZhX2djIC0gMTh0aCBOb3YubG9nLS0xMi01Mi0xMA==&channel=WEB" moz-do-not-send="true">https://gceasy.io/my-gc-report.jsp?p=YXJjaGl2ZWQvMjAyNC8xMS8xOC9qYXZhX2djIC0gMTh0aCBOb3YubG9nLS0xMi01Mi0xMA==&channel=WEB</a></div>
<div dir="auto" style="font-size:12.8px"><br>
</div>
<div dir="auto" style="font-size:12.8px">We increased the heap
size to 14 GB but it didn't help:</div>
<div dir="auto" style="font-size:12.8px"><br>
</div>
<div dir="auto" style="font-size:12.8px"><a href="https://gceasy.io/my-gc-report.jsp?p=YXJjaGl2ZWQvMjAyNC8xMS8yMC9qYXZhX2djLmxvZy0tMTctNDEtMjk=&channel=WEB" moz-do-not-send="true">https://gceasy.io/my-gc-report.jsp?p=YXJjaGl2ZWQvMjAyNC8xMS8yMC9qYXZhX2djLmxvZy0tMTctNDEtMjk=&channel=WEB</a></div>
<div dir="auto" style="font-size:12.8px"><br>
</div>
<div dir="auto" style="font-size:12.8px">I highly appreciate any
insights or recommendations to fine tune it, please.</div>
<div dir="auto" style="font-size:12.8px">
<div dir="auto"><br>
</div>
</div>
<div dir="auto" style="font-size:12.8px">Thank you in advance
for your time and support.</div>
<div dir="auto" style="font-size:12.8px"><br>
</div>
<div dir="auto" style="font-size:12.8px"><br>
</div>
<div dir="auto" style="font-size:12.8px">
<div dir="auto">OpenJDK 64-Bit Server VM (25.422-b05) for
linux-amd64 JRE (1.8.0_422-b05), built on Jul 10 2024
20:58:03 by "mockbuild" with gcc 4.8.5 20150623 (Red Hat
4.8.5-44)</div>
<div dir="auto">Memory: 4k page, physical 22439452k(19045348k
free), swap 4194300k(4194300k free)</div>
<div dir="auto">CommandLine flags:
-XX:InitialHeapSize=15032385536
-XX:InitialTenuringThreshold=4
-XX:InitiatingHeapOccupancyPercent=30 -XX:+ManagementServer
-XX:MaxHeapSize=15032385536 -XX:MaxTenuringThreshold=4
-XX:+ParallelRefProcEnabled -XX:+PrintGC
-XX:+PrintGCDateStamps -XX:+PrintGCDetails
-XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC
-XX:+PrintReferenceGC -XX:+PrintTenuringDistribution
-XX:+UseCompressedClassPointers -XX:+UseCompressedOops
-XX:+UseG1GC</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto">
<div dir="auto">2024-11-20T10:01:23.823+0100: 1.757: [GC
pause (Metadata GC Threshold) (young) (initial-mark)</div>
<div dir="auto">2024-11-20T10:01:23.839+0100: 1.773:
[SoftReference, 0 refs, 0.0010719 secs]</div>
<div dir="auto">2024-11-20T10:01:23.840+0100: 1.774:
[WeakReference, 492 refs, 0.0005143 secs]</div>
<div dir="auto">2024-11-20T10:01:23.841+0100: 1.775:
[FinalReference, 1914 refs, 0.0025155 secs]</div>
<div dir="auto">2024-11-20T10:01:23.843+0100: 1.777:
[PhantomReference, 0 refs, 0.0006570 secs]</div>
<div dir="auto">2024-11-20T10:01:23.844+0100: 1.778: [JNI
Weak Reference, 0.0000576 secs], 0.0223584 secs]</div>
<div dir="auto">2024-11-20T10:01:23.846+0100: 1.779: [GC
concurrent-root-region-scan-start]</div>
<div dir="auto">2024-11-20T10:01:23.850+0100: 1.783: [GC
concurrent-root-region-scan-end, 0.0039879 secs]</div>
<div dir="auto">2024-11-20T10:01:23.850+0100: 1.783: [GC
concurrent-mark-start]</div>
<div dir="auto">2024-11-20T10:01:23.855+0100: 1.789: [GC
concurrent-mark-end, 0.0053844 secs]</div>
<div dir="auto">2024-11-20T10:01:29.883+0100: 7.817: [GC
pause (G1 Evacuation Pause) (young)</div>
<div dir="auto">2024-11-20T10:01:31.675+0100: 9.609: [GC
pause (G1 Evacuation Pause) (young)</div>
<div dir="auto">2024-11-20T10:01:33.353+0100: 11.286: [GC
pause (G1 Evacuation Pause) (young)</div>
<div dir="auto">2024-11-20T10:01:35.989+0100: 13.923: [GC
pause (G1 Evacuation Pause) (young)</div>
<div dir="auto">2024-11-20T10:01:37.481+0100: 15.414: [GC
pause (G1 Evacuation Pause) (young)</div>
<div dir="auto">2024-11-20T10:01:40.874+0100: 18.807: [GC
pause (G1 Evacuation Pause) (young)</div>
<div dir="auto">2024-11-20T10:01:43.229+0100: 21.163: [GC
pause (G1 Evacuation Pause) (young)</div>
<div dir="auto">2024-11-20T10:01:46.703+0100: 24.637: [GC
pause (Metadata GC Threshold) (young) (initial-mark)</div>
<div dir="auto">2024-11-20T10:01:55.044+0100: 32.977: [GC
pause (G1 Evacuation Pause) (young)</div>
<div dir="auto"><br>
</div>
<div dir="auto">2024-11-20T15:00:04.646+0100: 17922.579: [GC
pause (G1 Evacuation Pause) (young) (initial-mark)</div>
<div dir="auto">2024-11-20T15:00:04.689+0100: 17922.622: [GC
concurrent-root-region-scan-start]</div>
<div dir="auto">2024-11-20T15:00:04.725+0100: 17922.659: [GC
concurrent-root-region-scan-end, 0.0365063 secs]</div>
<div dir="auto">2024-11-20T15:00:04.725+0100: 17922.659: [GC
concurrent-mark-start]</div>
<div dir="auto">2024-11-20T15:00:06.107+0100: 17924.040: [GC
pause (G1 Evacuation Pause) (young)</div>
<div dir="auto">2024-11-20T15:00:12.337+0100: 17930.270: [GC
cleanup 10530M->10490M(14336M), 0.0788429 secs]</div>
<div dir="auto">2024-11-20T15:00:12.416+0100: 17930.349: [GC
concurrent-cleanup-start]</div>
<div dir="auto">2024-11-20T15:00:15.700+0100: 17933.633: [GC
pause (G1 Evacuation Pause) (mixed)</div>
<div dir="auto">2024-11-20T15:00:19.262+0100: 17937.196: [GC
pause (G1 Evacuation Pause) (mixed)</div>
<div dir="auto">2024-11-20T15:00:21.759+0100: 17939.692: [GC
pause (G1 Evacuation Pause) (young) (initial-mark)</div>
<div dir="auto">2024-11-20T15:00:29.523+0100: 17947.457: [GC
concurrent-mark-end, 7.6961570 secs]</div>
<div dir="auto">2024-11-20T15:00:29.688+0100: 17947.622: [GC
cleanup 10369M->10329M(14336M), 0.0734577 secs]</div>
<div dir="auto">2024-11-20T15:00:47.950+0100: 17965.884: [GC
pause (G1 Evacuation Pause) (young) (initial-mark)</div>
<div dir="auto">2024-11-20T15:00:55.434+0100: 17973.368: [GC
concurrent-mark-end, 7.3457392 secs]</div>
<div dir="auto"><br>
</div>
<div dir="auto">2024-11-20T18:02:39.789+0100: [Full GC
(Allocation Failure) 13373M->10294M(14336M), 15.5035776
secs]</div>
<div dir="auto">2024-11-20T18:02:39.789+0100:
[SoftReference, 13012 refs, 0.0020701 secs]</div>
<div dir="auto">2024-11-20T18:02:39.789+0100:
[WeakReference, 140239 refs, 0.0156066 secs]</div>
<div dir="auto">2024-11-20T18:02:39.789+0100:
[FinalReference, 3610 refs, 0.0003202 secs]</div>
<div dir="auto">2024-11-20T18:02:39.789+0100:
[PhantomReference, 194 refs, 0.0000238 secs]</div>
<div dir="auto">2024-11-20T18:02:39.789+0100: [JNI Weak
Reference, 0.0003217 secs]</div>
<div dir="auto"><br>
</div>
<div dir="auto">2024-11-20T18:02:53.371+0100: [Full GC
(Allocation Failure) 13472M->10131M(14336M), 16.4023915
secs]</div>
<div dir="auto">2024-11-20T18:02:53.371+0100:
[SoftReference, 13771 refs, 0.0022936 secs]</div>
<div dir="auto">2024-11-20T18:02:53.371+0100:
[WeakReference, 138881 refs, 0.0158819 secs]</div>
<div dir="auto">2024-11-20T18:02:53.371+0100:
[FinalReference, 3644 refs, 0.0003447 secs]</div>
<div dir="auto">2024-11-20T18:02:53.371+0100:
[PhantomReference, 194 refs, 0.0000328 secs]</div>
<div dir="auto">2024-11-20T18:02:53.371+0100: [JNI Weak
Reference, 0.0003272 secs]</div>
<div dir="auto"><br>
</div>
<div dir="auto">2024-11-20T18:03:12.492+0100: [Full GC
(Allocation Failure) 12600M->10282M(14336M), 14.9648411
secs]</div>
<div dir="auto">2024-11-20T18:03:12.492+0100:
[SoftReference, 13027 refs, 0.0022496 secs]</div>
<div dir="auto">2024-11-20T18:03:12.492+0100:
[WeakReference, 135613 refs, 0.0150724 secs]</div>
<div dir="auto">2024-11-20T18:03:12.492+0100:
[FinalReference, 3643 refs, 0.0003302 secs]</div>
<div dir="auto">2024-11-20T18:03:12.492+0100:
[PhantomReference, 194 refs, 0.0000216 secs]</div>
<div dir="auto">2024-11-20T18:03:12.492+0100: [JNI Weak
Reference, 0.0003229 secs]</div>
<div dir="auto"><br>
</div>
<div dir="auto">2024-11-20T18:03:31.107+0100: [Full GC
(Allocation Failure) 13365M->10281M(14336M), 15.4983270
secs]</div>
<div dir="auto">2024-11-20T18:03:31.107+0100:
[SoftReference, 13110 refs, 0.0021606 secs]</div>
<div dir="auto">2024-11-20T18:03:31.107+0100:
[WeakReference, 135613 refs, 0.0149449 secs]</div>
<div dir="auto">2024-11-20T18:03:31.107+0100:
[FinalReference, 3641 refs, 0.0003340 secs]</div>
<div dir="auto">2024-11-20T18:03:31.107+0100:
[PhantomReference, 194 refs, 0.0000244 secs]</div>
<div dir="auto">2024-11-20T18:03:31.107+0100: [JNI Weak
Reference, 0.0003422 secs]</div>
<div dir="auto"><br>
</div>
<div dir="auto">2024-11-20T18:03:50.243+0100: [Full GC
(Allocation Failure) 13360M->10280M(14336M), 15.1688211
secs]</div>
<div dir="auto">2024-11-20T18:03:50.243+0100:
[SoftReference, 13110 refs, 0.0020750 secs]</div>
<div dir="auto">2024-11-20T18:03:50.243+0100:
[WeakReference, 135612 refs, 0.0149417 secs]</div>
<div dir="auto">2024-11-20T18:03:50.243+0100:
[FinalReference, 3641 refs, 0.0003294 secs]</div>
<div dir="auto">2024-11-20T18:03:50.243+0100:
[PhantomReference, 194 refs, 0.0000235 secs]</div>
<div dir="auto">2024-11-20T18:03:50.243+0100: [JNI Weak
Reference, 0.0003195 secs]</div>
</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
</div>
<div dir="auto" style="font-size:12.8px">Best regards</div>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre wrap="" class="moz-quote-pre">_______________________________________________
hotspot-gc-use mailing list
<a class="moz-txt-link-abbreviated" href="mailto:hotspot-gc-use@openjdk.org">hotspot-gc-use@openjdk.org</a>
<a class="moz-txt-link-freetext" href="https://mail.openjdk.org/mailman/listinfo/hotspot-gc-use">https://mail.openjdk.org/mailman/listinfo/hotspot-gc-use</a>
</pre>
</blockquote>
<br>
</body>
</html>