Re: [PATCH] perf jevents: Limit the number of JSON reading workers

[Arnaldo Carvalho de Melo]

On Fri, Sep 18, 2026 at 08:31:46AM -0700, Ian Rogers wrote:
> On Thu, Sep 17, 2026 at 3:00 AM Sandipan Das <sandipan.das@xxxxxxx> wrote:
> > The ProcessPoolExecutor is created without max_workers, so
> > concurrent.futures defaults to one worker per CPU and forks all of them
> > when the first task is submitted. Each worker costs the parent a few
> > file descriptors. For systems with high core-count processors like the
> > AMD EPYC 9996, the pool can easily exhaust RLIMIT_NOFILE as seen below.
<SNIP>

> > Fixes: eaab2eb09dc2 ("perf pmu-events: Parallelize JSON and metric pre-computation in jevents.py")
 
> Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>

Thanks, applied to perf-tools-next, for v7.4.

- Arnaldo