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

[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.

One option would to re-structure by changing 'make check' to run the 
build tests first, and then actually run the tests and follow the 
.NOTPARELLEL semantic.