rmuir commented on issue #14315:
URL: https://github.com/apache/lucene/issues/14315#issuecomment-2691684579
easy to reproduce on linux if you want to dive in more:
terminal 1: for monitoring whole system and locating PID
```console
$ sudo perf top --sort overhead,overhead_us,overhead_sys,pid,dso,symbol
--demangle-kernel
```
terminal 2: execute test:
```console
$ ./gradlew :lucene:misc:test --tests
"org.apache.lucene.misc.store.TestDirectIODirectory" -Ptests.jvms=4
-Ptests.jvmargs= -Ptests.seed=DEE483D0402DBE52 -Ptests.multiplier=2
-Ptests.useSecurityManager=true -Ptests.nightly=true -Ptests.vectorsize=512
-Ptests.forceintegervectors=true
```
After starting test, watch "terminal 1" for the test to show up and grab its
pid:
```
Samples: 241K of event 'cycles:P', 4000 Hz, Event count (approx.):
45392862505 lost: 0/0 drop: 0/0
Overhead usr sys Pid:Command Shared Object
Symbol
6.01% 0.00% 7.68% 10783:TEST-TestDirect [kernel]
[k] rep_stos_alternative <-- in this example PID 10783
```
terminal 3: strace PID of test when you see it climb to the top of `perf top`
```console
$ strace -p 10783
```
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