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https://issues.apache.org/jira/browse/CASSANDRA-18831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18056302#comment-18056302
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Dmitry Konstantinov commented on CASSANDRA-18831:
-------------------------------------------------
h2. Shenandoah GC results
100 and 200 client threads
[^jdk_gc_g1_zgc_shen.html]
configuration:
{code:java}
-XX:+UnlockExperimentalVMOptions
-XX:+UseShenandoahGC
-XX:ShenandoahGCHeuristics=static
-XX:ShenandoahMinFreeThreshold=50 {code}
||Shenandoah (non-gen), JDK 21, 100 client threads||Shenandoah (non-gen), JDK
21, 200 client threads||
|
Op rate : 141,221 op/s [insert: 141,221 op/s]
Partition rate : 141,221 pk/s [insert: 141,221 pk/s]
Row rate : 1,412,214 row/s [insert: 1,412,214 row/s]
Latency mean : 0.7 ms [insert: 0.7 ms]
Latency median : 0.6 ms [insert: 0.6 ms]
Latency 95th percentile : 1.1 ms [insert: 1.1 ms]
Latency 99th percentile : 1.6 ms [insert: 1.6 ms]
Latency 99.9th percentile : 12.7 ms [insert: 12.7 ms]
Latency max : 39.0 ms [insert: 39.0 ms]
Total partitions : 15,000,000 [insert: 15,000,000]
Total errors : 0 [insert: 0]
Total GC count : 162
Total GC memory : 114.859 GiB
Total GC time : 74.2 seconds
Avg GC time : 458.3 ms
StdDev GC time : 938.6 ms
Total operation time : 00:01:46|Op rate : 157,846 op/s
[insert: 159,524 op/s]
Partition rate : 157,846 pk/s [insert: 159,524 pk/s]
Row rate : 1,578,456 row/s [insert: 1,595,243 row/s]
Latency mean : 1.2 ms [insert: 1.2 ms]
Latency median : 1.0 ms [insert: 1.0 ms]
Latency 95th percentile : 2.4 ms [insert: 2.4 ms]
Latency 99th percentile : 4.9 ms [insert: 4.9 ms]
Latency 99.9th percentile : 19.7 ms [insert: 19.7 ms]
Latency max : 54.8 ms [insert: 54.8 ms]
Total partitions : 15,000,000 [insert: 15,000,000]
Total errors : 0 [insert: 0]
Total GC count : 160
Total GC memory : 28.846 GiB
Total GC time : 87.6 seconds
Avg GC time : 547.6 ms
StdDev GC time : 1,115.2 ms
Total operation time : 00:01:35|
> JDK21 support
> -------------
>
> Key: CASSANDRA-18831
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18831
> Project: Apache Cassandra
> Issue Type: Task
> Components: Build
> Reporter: Achilles Benetopoulos
> Assignee: Josh McKenzie
> Priority: Normal
> Labels: pull-request-available
> Fix For: 5.1
>
> Attachments: batch_profile_seq.yaml,
> image-2026-02-03-19-05-41-619.png, image-2026-02-03-19-16-37-640.png,
> jdk21-patch, jdk_gc.html, jdk_gc_g1_zgc_shen.html
>
> Time Spent: 9h
> Remaining Estimate: 0h
>
> This patch builds on the work in CASSANDRA-16895 that added JDK17 to the list
> of supported Java versions, and extends that work to enable building and
> running Cassandra under JDK21.
> The following commits comprise the changes included in the attached patch:
> -
> [https://github.com/apache/cassandra/commit/b15d4d6980e787ab5f3405ca8cb17a9c92a4aa47]
> -
> [https://github.com/apache/cassandra/commit/0c5df38dafe58bfec8924e81507bb604e1543897]
> -
> [https://github.com/apache/cassandra/commit/6506b7279d98eed4b2b65b71e0c6f41eb78c6913]
> -
> [https://github.com/apache/cassandra/commit/564cbd534c5a975cda0c629c14c68c8745b41451]
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