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Re: if-conversion a performance bottleneck
- To: lucier at math dot purdue dot edu, pfeifer at dbai dot tuwien dot ac dot at
- Subject: Re: if-conversion a performance bottleneck
- From: Brad Lucier <lucier at math dot purdue dot edu>
- Date: Fri, 5 May 2000 15:46:07 -0500 (EST)
- Cc: rth at cygnus dot com, mrs at windriver dot com, gcc at gcc dot gnu dot org, matzmich at cs dot tu-berlin dot de
> On Fri, 5 May 2000, Brad Lucier wrote:
> > make -j 9 bootstrap
> >
> > or whatever, and it doesn't seem to actually set off a bunch of parallel
> > jobs---definitely, by the time the stage1 compiler starts compiling
> > things, I'm down to one job at a time. That's with the 2.2.13 kernel
> > on alpha with make 3.77; is this a known problem? Should I upgrade
> > make?
>
> Please do so and let us know the results!
>
> It would be very useful to document properly, how to use parallel
> makes for GCC -- perhaps you could come up with a patch for our
> documentation at?
>
> http://gcc.gnu.org/install/build.html
After upgrading make from version 3.77 to version 3.79,
make -j 9 bootstrap
works as I think it should---it consistently has about 9 processes
running in various subdirectories throughout the build process.
Brad