Hi,
We recently upgraded to 2.504.1 and we're seeing something new in terms of
memory usage, compared to what we saw on previous versions.
If I grab a heap histogram from our instance, the top 25 rows include these:
org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTKey 1,781,309
8 76,002,555 12
org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTValue$ConstantValue
1,638,513 7 69,909,920 11
org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTKeyValueOrMethodCallPair
1,280,275 6 54,625,073 8
org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTStage 535,756
2 7,619,649 1
org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTValue$GStringValue
356,297 1 15,202,023 2
org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTBuildParameter
355,548 1 15,170,050 2
org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTTreeStep 284,657
1 9,109,032 1
org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTBranch 214,622
1 9,157,217 1
org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTSingleArgument
213,434 1 9,106,528 1
That's a couple gigs worth of objects, all from
org.jenkinsci.plugins.pipeline.modeldefinition.ast. I haven't seen this in the
past on previous versions, so I wonder where this is coming from.
It doesn't look like a leak, because the number of instances is reduced from
time to time:
[2025-06-02 Mon 15:43]
org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTKey 1,801,626 8
76,869,393
[2025-06-02 Mon 16:38]
org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTKey 1,801,662 8
76,870,929
[2025-06-03 Tue 08:33]
org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTKey 1,801,852 8
76,879,035
[2025-06-04 Wed 13:40]
org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTKey 1,802,594 8
76,910,718
[2025-06-05 Thu 09:02]
org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTKey 1,803,241 8
76,938,305
[2025-06-06 Fri 08:19]
org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTKey 1,804,019 8
76,971,487
[2025-06-06 Fri 14:16]
org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTKey 1,781,309 8
76,002,555
Any ideas?
Thanks,
Radek
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