On Wed, Jun 02, 2010 at 08:47:54PM -0400, Alexander Hansen wrote:
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> On 6/2/10 8:43 PM, Jack Howarth wrote:
> > On Wed, Jun 02, 2010 at 08:36:58PM -0400, Alexander Hansen wrote:
> > On 6/2/10 8:26 PM, Jack Howarth wrote:
> >>>> On Wed, Jun 02, 2010 at 08:04:20PM -0400, Benjamin Reed wrote:
> >>>> On 6/2/10 7:55 PM, Jack Howarth wrote:
> >>>>>>> One possible workaround might be to change gcc45.info
> >>>>>>> to reduce the number of parallel builds so that the
> >>>>>>> load sensitivity is reduced. So instead of using...
> >>>>>>>
> >>>>>>> num_cpu=$(echo `sysctl -n hw.ncpu`)
> >>>>>>> make -j $num_cpu
> >>>>>>>
> >>>>>>> we would reduce num_cpu by one if greater
> >>>>>>> than one so that the build is either serial
> >>>>>>> or leaves a free core whenever building in parallel.
> >>>>>>> This won't 'fix' the problem but it might make
> >>>>>>> it less likely.
> >>>>
> >>>> So if GCC's build is not repeatably compatible with -jN, then it
> >>>> should probably not be doing it by default. :P
> >>>>
> >>>>> This is a recent regression upstream. The question is do you
> >>>>> penalize all users with multiple core machines for those
> >>>>> unlucky users running two cores at high load? As I said before,
> >>>>> a rational (and less extreme) workaround would be to leave
> >>>>> a free core available to reduce the load on the machine.
> >>>>> I build gcc trunk nightly and have never seen this failure
> >>>>> on a dual quad.
> >>>>> Jack
> >>>>
> >>>>
> >>>>
> >
> > I'll point out that I had my single instance of this failure on a
> > single-core powerpc, and had no such problem building on a two-core
> > Macbook under load.
> >
> >> Are you sure you're not confusing the issue with...
> >
> >> cp %b/gcc/config/darwin-sections.def
> >> %i/lib/gcc4.5/lib/gcc/%m-apple-darwin${darwinvers}/%v/plugin/include/config
> >
> >> on powerpc? I suspect these are totally different problems. The compiler
> >> plugin support apparently isn't installing the plugin header directory
> >> on powerpc-apple-darwin. As I mentioned before, this cp comamnd can be
> >> skipped on powerpc because there will never be a dragonegg compiler
> >> plugin for powerpc (only i386 and x86_64 darwin).
> >
> >
> I'm not confusing anything. I mentioned earlier in this thread that I
> had an instance of _this_ problem:
>
So that implies that the parallel build on even a single job
can trigger the problem. Definitely there is little reason to
parallel build on a single core so we could limit the parallel
builds to machines with more than two cores for safety.
> http://article.gmane.org/gmane.os.macosx.fink.devel/19413
> "I got the same thing on my 10.5.8/powerpc machine once, but it didn't
> show up again. Peter O'Gorman also said on IRC that this seemed to be
> intermittent, so it might be worth just trying again."
> - --
> Alexander Hansen
> Fink User Liaison
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