On Tue, Aug 12, 2014 at 10:31 PM, Sergei Trofimovich wrote:
Good evening all!
Currently when being ran './validate' script (without any parameters): - builds ghc using 2 parallel jobs - runs testsuite using 2 parallel jobs
I propose to change the default value to amount of available CPUs: - build ghc using N+1 parallel jobs - run testsuite using N+1 parallel jobs
Pros: - first-time users will get faster ./validate - seasoned users will need less tweaking for buildbots
Cons: - for imbalanced boxes (32 cores, 8GB RAM) it might be quite painful to drag box out of swap
What do you think about it?
Isn't the memory use also a problem on boxes with a much lower number of cores (e.g. 7.8 space leak(s))? On one machine with 1GB per core, I had to limit cabal install's parallelism when using 7.8. Assuming the patch goes in, is there a way to limit parallel jobs on the command line?