linux-kernel - Re: [PATCH v1 9/9] perf tests: Add option to run tests in parallel

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Message-ID: <CAP-5=fXq2CTwSO8QVRdgz2uR73DrGU9qD3z5gPPD3ZEncsn36w@mail.gmail.com>
Date:   Mon, 4 Dec 2023 13:14:23 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        James Clark <james.clark@....com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        John Garry <john.g.garry@...cle.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v1 9/9] perf tests: Add option to run tests in parallel

On Mon, Dec 4, 2023 at 12:30 PM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> Em Fri, Dec 01, 2023 at 06:06:12PM -0800, Ian Rogers escreveu:
> > On Fri, Dec 1, 2023 at 3:50 PM Ian Rogers <irogers@...gle.com> wrote:
> > >
> > > By default tests are forked, add an option (-p or --parallel) so that
> > > the forked tests are all started in parallel and then their output
> > > gathered serially. This is opt-in as running in parallel can cause
> > > test flakes.
> > >
> > > Rather than fork within the code, the start_command/finish_command
> > > from libsubcmd are used. This changes how stderr and stdout are
> > > handled.
> > >
> > > Signed-off-by: Ian Rogers <irogers@...gle.com>
> >
> > Actually, I think this patch needs more work. The verbose output is
> > degraded and missing in some cases. Suggestions on how to fix welcome.
>
> I'll think about, but to make progress I think the first 8 patches in
> this series can be considered now?

That would be great. Thanks!

Ian