[FFmpeg-devel] [PATCH]Use -parallel when compiling with icc
Tue Jan 20 01:47:03 CET 2009
On Tue, Jan 20, 2009 at 12:42:59AM +0000, Carl Eugen Hoyos wrote:
> M?ns Rullg?rd <mans <at> mansr.com> writes:
> > > + # Use -parallel option, as recommended by Intel, but keep quiet about it
> > > + check_cflags -parallel
> > > + check_cflags -par-report=0
> > > + check_ldflags -parallel
> > > fi
> > What effect does that flag have?
> (From man icc)
> It enables the auto-parallelizer to generate multi-threaded code for loops that
> can be safely executed in parallel.
You should _very_ carefully benchmark that. It is not unlikely to slow
things down, at least when used globally.
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