[PATCH 0/5] Improve make and make check parallelism

[Florian Weimer]

* Adhemerval Zanella Netto:

> On 15/06/26 11:15, Florian Weimer wrote:
>> * Adhemerval Zanella:
>> 
>>> The series does not aim to improve 'make check' with
>>> run-built-tests=yes: subdirectories such as nptl require their tests
>>> not to run in parallel.
>> 
>> Based on my logs, it seems to me that nptl tests now run in parallel
>> with other directories.  Do others see this as well?
>> 
>> This somewhat defeats the .NOTPARALLEL directive for nptl (and rt).
>
> Yes, but nptl sub-make reads nptl/Makefile, hits .NOTPARALLEL and within
> that process the nptl tests run one at a time.
>
> Making the nptl's tests to additionally not overlap with other subdirs 
> (restore the old isolation), would need an explicit serialization edge 
> and that would erase much of the parallel-check speedup.

Only a subset of the nptl tests would need this anyway.  And we have
other tests that are CPU burners or that need tons of RAM that should
not be parallelized, either.

I think we could have a top-level .NOTPARALLEL wrapper that tests
everything except nptl/htl and rt (without applying .NOTPARALLEL), then
nptl/htl, and then rt.  Not sure if there's a simpler approach to get
the desired semantics.

Thanks,
Florian