On 06/28/10 06:12 AM, John H Palmieri wrote:
On Jun 27, 9:56 pm, Nils Bruin<nbr...@sfu.ca> wrote:
On Jun 27, 7:41 pm, John H Palmieri<jhpalmier...@gmail.com> wrote:
But there is now also a directory spkg/logs/ in which the output for
each package gets written into a separate file. So you can use those
for troubleshooting.
That is not present (does that get cleaned up by make clean?) so
perhaps I didn't do everything that is required for a parallel make.
After looking at the source code, I think that this directory
(SAGE_ROOT/spkg/logs) should be there and contain one log file for
each spkg regardless of whether you do a parallel build. The relevant
code was added in Sage 4.5.alpha0, and it's also possible that it
wouldn't be there if you did a "sage -upgrade", only if you built from
scratch.
Oh, I see looking at your earlier message that you're using 4.4.4.
That explains it. Whatever problems you were having had to do with
MAKE='make -j4', not SAGE_PARALLEL_SPKG_BUILD.
On my Mac, building in parallel (version 4.5.alpha0) with 'make -j2'
cut the build time from 140 minutes to 90 minutes. I haven't tried
with 'make -j4' because the machine only has 2 cores. I should try
that and see what happens.
Sometime I read recently said about 1.5x the number of CPUS was best. So I'd try
2, 3 and 4, and see where you get.
It's more impressive on t2.math.washington.edu, a Solaris machine:
without the parallel build, it took me 17 hours, but the parallel
build takes under 5 hours.
--
John
I assume that is not rebuilding ATLAS, as I think that takes more than 5 hours.
Clint, the ATLAS developer said his latest version of ATLAS builds in under an
hour on t2, but I've been unable to get it to build reliably in parallel, so I
think one needs to keep MAKE unset in the atlas package. At which point, it
takes quite a while to build.
dave
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