PARALLEL_MAKE default to core count

It looks like GHA changed their build environment at some point. As I read it, runners now get 4 cores.

python 3.4 added os.cpu_count(), which could provide a dynamic default.

Lines 154 to 156 in 4e4f33e

    
           ci['parallel_make'] = 2 
        
           if 'PARALLEL_MAKE' in os.environ: 
        
               ci['parallel_make'] = int(os.environ['PARALLEL_MAKE'])

Closed by #106.

A quick test with PVXS shows that ubuntu-latest does now build with -j4. Overall runtime seems to be about the same so far. No magic 50% speedup :(

We would probably need to optimize the layout of our source files. (Not suggesting this.)

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PARALLEL_MAKE default to core count #105

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	ci['parallel_make'] = 2
	if 'PARALLEL_MAKE' in os.environ:
	ci['parallel_make'] = int(os.environ['PARALLEL_MAKE'])

PARALLEL_MAKE default to core count #105

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ralphlange commented on Nov 18, 2025

mdavidsaver commented on Nov 20, 2025

ralphlange commented on Nov 20, 2025

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