janhoy commented on PR #3291:
URL: https://github.com/apache/solr/pull/3291#issuecomment-2760808394
Did some more testing and a weakness of the solution is that the Powershell
process is spawned once for every Java process running on the system, and each
invocation takes some 3-5 seconds on the Win11 VM on my MacBook. Don't know if
such slow invocation is representative for a real windows system, but it is an
overhead. I have not done a comparison for the old wmic invocation. Manual
command invocation in a PS terminal takes <1s. While manually invoking
`powershell.exe -Command "foo"` from a CMD terminal takes 2+ secs, perhaps
there's a startup cost in starting powershell process.
So I refactored the code to instead of calling PS once per PID, we do one
full PID list on startup with
```
"Get-CimInstance -ClassName Win32_Process | Where-Object { $_.Name -like
'*java*' } | Select-Object ProcessId, CommandLine | ConvertTo-Json -Depth 1"
```
and stuffs it into a `Map<Long, String>` for later lookup.
The OSHI library, using jna would probably be far more performant, but I
agree that adding a 1Mb jar just for this is too much.
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