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[bug #44555] "make" fails to use parallelism

From: anonymous
Subject: [bug #44555] "make" fails to use parallelism
Date: Tue, 17 Mar 2015 20:41:52 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:36.0) Gecko/20100101 Firefox/36.0 Iceweasel/36.0

Follow-up Comment #3, bug #44555 (project make):

To reply to a few points I didn't specifically address in my last comment:

* make isn't actually dropping into single-job mode, as can be seen from "make
--debug=j", but for some reason it's having trouble starting as many jobs as
* no, -O/--output-sync is not required to observe the problem
* I didn't spot anything that looked relevant in --trace
* like the Makefile generated by mkmk.sh, our build is nonrecursive.

Having no make step that takes appreciable CPU time is a lot like our case,
where frequently ccache hit rates exceed 95% (multiple developers share ccache
via nfs and work with substantially-similar source trees)


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