linux-kernel - Re: [PATCH v2 0/8] Run tests in parallel showing number of tests running

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Message-ID: <ZxBQ6Z2dvxmQ9Vi0@google.com>
Date: Wed, 16 Oct 2024 16:48:57 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	James Clark <james.clark@...aro.org>,
	Howard Chu <howardchu95@...il.com>,
	Athira Jajeev <atrajeev@...ux.vnet.ibm.com>,
	Michael Petlan <mpetlan@...hat.com>,
	Veronika Molnarova <vmolnaro@...hat.com>,
	Dapeng Mi <dapeng1.mi@...ux.intel.com>,
	Thomas Richter <tmricht@...ux.ibm.com>,
	Ilya Leoshkevich <iii@...ux.ibm.com>,
	Colin Ian King <colin.i.king@...il.com>,
	Weilin Wang <weilin.wang@...el.com>,
	Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v2 0/8] Run tests in parallel showing number of tests
 running

On Fri, Oct 11, 2024 at 03:03:46PM -0700, Ian Rogers wrote:
> Avoid waitpid so that stdout/stderr aren't destroyed prior to wanting
> to read them for display. When running on a color terminal, display
> the number of running tests (1 if sequential). To avoid previous
> flicker, only delete and refresh the display line when it changes. An
> earlier version of this code is here:
> https://lore.kernel.org/lkml/20240701044236.475098-1-irogers@google.com/
> 
> Add a signal handler for perf tests so that unexpected signals are
> displayed and test clean up is possible.
> 
> In perf test add an "exclusive" flag that causes a test to be run with
> no other test. Set this flag manually for C tests and via a
> "(exclusive)" in the test description for shell tests. Add the flag to
> shell tests that may fail when run with other tests.
> 
> Change the perf test loop to run in two passes. For parallel
> execution, the first pass runs all tests that can be run in parallel
> then the 2nd runs remaining tests sequentially. This causes the
> "exclusive" tests to be run last and with test numbers moderately out
> of alignment.
> 
> Change the default to be to run tests in parallel. Running tests in
> parallel brings the execution time down to less than half.
> 
> v2: Fix inaccurate remaining counts when running specific
>     tests. Rename "remaining" to "active" to better reflect the
>     testing behavior. Move the exclusive flag to test cases and not
>     entire suites. Add more "(exclusive)" flags to test as
>     suggested-by James Clark. Remove "(exclusive)" flag from test
>     descriptions to keep the command line output more concise. Add
>     James Clark's tested-by.
> 
> Ian Rogers (8):
>   tools subcmd: Add non-waitpid check_if_command_finished()
>   perf test: Display number of active running tests
>   perf test: Reduce scope of parallel variable
>   perf test: Avoid list test blocking on writing to stdout
>   perf test: Tag parallel failing shell tests with "(exclusive)"
>   perf test: Add a signal handler around running a test
>   perf test: Run parallel tests in two passes
>   perf test: Make parallel testing the default

Nice work!  It looks much better now.

But I'm seeing more failures in parallel mode.  Maybe we want to
keep the default serial mode for a little more.

Thanks,
Namhyung

> 
>  tools/lib/subcmd/run-command.c                |  33 +++
>  tools/perf/tests/builtin-test.c               | 274 ++++++++++++------
>  .../tests/shell/coresight/asm_pure_loop.sh    |   2 +-
>  .../shell/coresight/memcpy_thread_16k_10.sh   |   2 +-
>  .../coresight/thread_loop_check_tid_10.sh     |   2 +-
>  .../coresight/thread_loop_check_tid_2.sh      |   2 +-
>  .../shell/coresight/unroll_loop_thread_10.sh  |   2 +-
>  tools/perf/tests/shell/list.sh                |   5 +-
>  .../tests/shell/perftool-testsuite_report.sh  |   2 +-
>  tools/perf/tests/shell/record.sh              |   2 +-
>  tools/perf/tests/shell/record_lbr.sh          |   2 +-
>  tools/perf/tests/shell/record_offcpu.sh       |   2 +-
>  tools/perf/tests/shell/stat_all_pmu.sh        |   2 +-
>  tools/perf/tests/shell/test_arm_coresight.sh  |   2 +-
>  .../tests/shell/test_arm_coresight_disasm.sh  |   2 +-
>  tools/perf/tests/shell/test_arm_spe.sh        |   2 +-
>  tools/perf/tests/shell/test_intel_pt.sh       |   2 +-
>  .../perf/tests/shell/test_stat_intel_tpebs.sh |   2 +-
>  tools/perf/tests/task-exit.c                  |   9 +-
>  tools/perf/tests/tests-scripts.c              |   7 +-
>  tools/perf/tests/tests.h                      |   9 +
>  tools/perf/util/color.h                       |   1 +
>  22 files changed, 258 insertions(+), 110 deletions(-)
> 
> -- 
> 2.47.0.rc1.288.g06298d1525-goog
>