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Re: [PATCH] gcc parallel make check

On Fri, Sep 12, 2014 at 04:42:25PM -0700, Mike Stump wrote:
> curious, when I run atomic.exp=stdatom\*.c:
>   gcc.dg/atomic/atomic.exp completed in 30 seconds.
> atomic.exp=c\*.c takes 522 seconds with 3, 2, 5 and 4 being the worst offenders.

That's the
        @if [ -z "$(filter-out --target_board=%,$(filter-out --extra_opts%,$(RUNTESTFLAGS)))" ] \
            && [ "$(filter -j, $(MFLAGS))" = "-j" ]; then \
i.e. if you specify anything in RUNTESTFLAGS other than --target_board= or
--extra_opts, it is not parallelized.  This was done previously because
parallelization required setting the flags to something different (manually
created *.exp list).  The first [] could perhaps be removed now, if one e.g.
RUNTESTFLAGS=atomic.exp etc. with sufficiently enough tests, parallelization
will be still worth it.  I've been worried about the quick cases where
parallelization is not beneficial, like make check-gcc \
RUNTESTFLAGS=dg.exp=pr60123.c or similar, but one doesn't usually pass -jN
in that case.  So yes, the
[ -z "$(filter-out --target_board=%,$(filter-out --extra_opts%,$(RUNTESTFLAGS)))" ]
can be dropped (not in libstdc++ though, there are abi.exp and
prettyprinters.exp still run serially, though even that could be handled the
struct-layout-1.exp way, of running it by the first instance to encounter
those with small changes in those *.exp files).


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