Re: [PATCH v3 24/34] t/perf/p7519: speed up test using "test-tool touch"

On Tue, Jul 13, 2021 at 10:10 AM Jeff Hostetler [off-list ref] wrote:

On 7/1/21 7:09 PM, Ævar Arnfjörð Bjarmason wrote:

quoted

Did you try to replace this with some variant of:

     test_seq 1 10000 | xargs touch

Which (depending on your xargs version) would invoke "touch" commands
with however many argv items it thinks you can handle.

a quick test on my Windows machine shows that

        test_seq 1 10000 | xargs touch

takes 3.1 seconds.

just a simple

        test_seq 1 10000 >/dev/null

take 0.2 seconds.

using my test-tool helper cuts that time in half.

Yeah, test_seq is pretty bad; it's just a loop in shell.  Is there a
'seq' on windows, and does using it instead of test_seq make things
faster with Ævar's suggested command?

I'd really like to modify test_seq to use seq when it's available and
fall back to the looping-in-shell when we need to for various
platforms.

Maybe it'd even make sense to write a 'test-tool seq' and make
test_seq use that just so we can rip out that super lame shell
looping.