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Re: Git and GCC
On Thu, Dec 06, 2007 at 07:31:21PM -0800, David Miller wrote:
> > So it is about 5% bigger. What is really disappointing is that we saved
> > only about 20% of the time. I didn't sit around watching the stages, but
> > my guess is that we spent a long time in the single threaded "writing
> > objects" stage with a thrashing delta cache.
>
> If someone can give me a good way to run this test case I can
> have my 64-cpu Niagara-2 box crunch on this and see how fast
> it goes and how much larger the resulting pack file is.
That would be fun to see. The procedure I am using is this:
# compile recent git master with threaded delta
cd git
echo THREADED_DELTA_SEARCH = 1 >>config.mak
make install
# get the gcc pack
mkdir gcc && cd gcc
git --bare init
git config remote.gcc.url git://git.infradead.org/gcc.git
git config remote.gcc.fetch \
'+refs/remotes/gcc.gnu.org/*:refs/remotes/gcc.gnu.org/*'
git remote update
# make a copy, so we can run further tests from a known point
cd ..
cp -a gcc test
# and test multithreaded large depth/window repacking
cd test
git config pack.threads 4
time git repack -a -d -f --window=250 --depth=250
-Peff