RFR: 8356277: containers/docker/TestPids.java: Limit value 19128 is not accepted as unlimited

[Severin Gehwolf]

On Tue, 6 May 2025 14:06:54 GMT, Jan Kratochvil <jkratochvil at openjdk.org> wrote:

> When running the testcase in a VM with 16GB RAM it fails as systemd limits DefaultTasksMax based on available RAM.
> 
> 
> test/hotspot/jtreg/containers/docker/TestPids.java
> TEST RESULT: Failed. Execution failed: `main' threw exception: java.lang.RuntimeException: Limit value 19128 is not accepted as unlimited, log line was [0.083s][trace][os,container] Maximum number of tasks is: 19128
> 
> 
> DefaultTasksMax=28776 for RAM 24576MB
> DefaultTasksMax=19128 for RAM 16384MB
> DefaultTasksMax=1088 for RAM 1024MB
> 
> The testcase expects DefaultTasksMax>=20000.

Not sure if it's worth this complication for the test. I have this setting in `/etc/systemd/system.conf` for that reason:


$ grep DefaultTasksMax /etc/systemd/system.conf
DefaultTasksMax = 31000


Maybe we could amend the failure message instead to add this config?

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PR Comment: https://git.openjdk.org/jdk/pull/25067#issuecomment-2866537562