Re: if-conversion a performance bottleneck

Re: if-conversion a performance bottleneck

[Brad Lucier]

> 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

PATCH: install/build.html (was: if-conversion a performance bottleneck)

[Gerald Pfeifer]

On Fri, 5 May 2000, Brad Lucier wrote:
> 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.

Thanks for the feedback. I have installed the documentation patch below.

Index: build.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/install/build.html,v
retrieving revision 1.23
diff -r1.23 build.html
98,99c98,100
< <p> If you have a multiprocessor you can use `<code>make bootstrap
< MAKE="make -j 2" -j 2</code>' instead of just `<code>make bootstrap</code>'
---
> <p> If you have a multiprocessor system you can use `<code>make bootstrap
> MAKE="make -j 2" -j 2</code>' or just `<code>make -j 2 bootstrap</code>'
> for GNU Make 3.79 and above instead of just `<code>make bootstrap</code>'