Re: PoC: Allow parallel 'make test' (was: Re: PATCHv2: Allow parallel make)

["Daniel Shahaf" <d.s@xxxxxxxxxxxxxxxxxx>]

Daniel Shahaf wrote on Tue, 22 Sep 2026 00:50 +00:00:
> Timings:
>
> make -C zsh test  63.19s user 14.19s system 55% cpu 2:18.63 total
> make -C zsh test  67.71s user 20.41s system 161% cpu 54.494 total

Furthermore, with MAX_CPUS set to the number of *.ztst files:

+MAX_CPUS=$(function () { print $# } ${ZTST_root_of_source_tree}/Test/*.ztst)
make -C zsh test  77.79s user 25.82s system 484% cpu 21.366 total

This sidesteps the batching behaviour of zargs:

> > # Because of "wait" limitations, --max-procs spawns max-procs jobs, then
> > # waits for all of those, then spawns another batch, etc.

> @@ -36,8 +164,28 @@ for file in "${(f)ZTST_testlist}"; do
> +  zargs \
> +    --no-run-if-empty \
> +    -n1 \
> +    --max-procs "${MAX_CPUS}" \

Aside: The usage message of zargs implies that --max-procs="${MAX_CPUS}"
should work, but in fact it doesn't work as «--foo=bar», only as «--foo bar».

Also, zargs evaluates $wait but never sets it.

> +    "${(f)ZTST_testlist}" \
> +    -- run_one_file

Cheers,

Daniel