[lfs-dev] Perl test times

Bruce Dubbs bruce.dubbs at gmail.com
Fri Jun 30 11:47:49 PDT 2017


Jonathan Cottrill wrote:
> As mentioned in Chapter 6, the Perl tests take quite a bit of time when run
> with "make -k test". The testing framework used by Perl doesn't respect the -j
> option to make, so the tests never run in parallel.
>
> There's another way to run the Perl test suite, using the test_harness make
> target and the TEST_JOBS variable; for example:
>
> TEST_JOBS=8 make test_harness
>
> (I picked 8 in this case based on trial and error and load averages on my
> quad-core system.) On my system, the test time went from 10m6s to 2m24s.
>
> The docs (https://perldoc.perl.org/perlhack.html#Parallel-tests) do point out
> a caveat that could make this less than ideal for LFS builders: There are some
> tests that supposedly become flaky when run in parallel, like dist/IO/t/
> io_dir.t. However, I've run the suite several times this way, and have yet to
> see any new failures (the expected Compress-Raw-Zlib and IO-Compress failures
> still occur, of course). dist/IO/t/io_dir.t is always reported as "ok".
>
> A slight oddity of running this way is that the output is a bit different.
> Skipped tests have additional information about why they're skipped, and the
> final report on test failures is more detailed.

At about 2.5 SBU, I do not think the test time for perl is excessive.  I 
think we can just leave this as is.

I have added notes to libtool and autoconf on how to speed up tests.

   -- Bruce



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