For what it's worth, on my 12GB of ram mac pro: $ sudo sysctl -w kern.maxvnodes=384000 kern.maxvnodes: 197632 -> 384000
Took times from 2.11-2.06 down to 2.05-2.02. I.e. it made a small difference, but not much. The 64 bit patch definitely seemed to help, but I didn't think to time before and after. J On Wed, Dec 8, 2010 at 11:38 PM, Eric Seidel <[email protected]> wrote: > Mark Rowe pointed out to me over IRC that the real problem is we're > blowing out the vnode cache. > > Even on an 8GB machine, the default cache is too small for all of > WebKit to fit in it. > > On my 4GB machine (and on Mark's 8GB) we tried incrementing the cache > to 384000 (the 4GB default is 64512 and the 8GB default is 128000). > > My git status times dropped again by over 50% to 2.6 seconds! (still > an eternity compared to a linux machine of course...) > > If you'd like to play around with this, you can set your vnode cache limit > with: > sudo sysctl -w kern.maxvnodes=384000 > > You can read it with: > sysctl kern.maxvnodes > > You can test to see if the cache is large enough by trying: > git status; time git status > > the second one should be very fast if your cache is large enough. > > I don't know what the exact right trade-off is. I believe the vnode > cache uses wired memory (which is a limited resource!). As far as I > can tell you can't decrease the cache max w/o rebooting. sysctl will > set it, but setting it to a smaller number seems to have not effect. > > I don't know how to make the setting last across reboots. Mark > mentioned that putting the setting in /etc/sysctl.conf should work, > but that at least for his machine that didn't seem to have any effect > for this particular setting. > > That's what I know. > > -eric > > > On Wed, Dec 8, 2010 at 3:02 PM, Eric Seidel <[email protected]> wrote: > > > > FYI, my git status runs on my Mac Book Pro were an average of 9.2 seconds > (git version 1.7.1, git-osx-installer) before installing Mihai's 64bit build > (git version 1.7.3.3), and were 6.0 seconds after. > > -eric > > > > On Wed, Dec 8, 2010 at 2:20 PM, Eric Seidel <[email protected]> wrote: > >> > >> I've posted a patch to make webkit-patch warn users when they're on a > 64-bit system with a 32-bit git: > >> https://bugs.webkit.org/show_bug.cgi?id=50715 > >> 4 seconds on every git status is huge. webkit-patch upload has to run > at least 3 git status commands (due to expecting files to change on disk > during operation), so this means a savings of 12 seconds on your machine! > >> -eric > >> On Tue, Dec 7, 2010 at 4:04 PM, Mihai Parparita <[email protected]> > wrote: > >>> > >>> After complaining to a Linux-using friend for the n-th time that "git > >>> status" was much slower on my Snow Leopard machine than on his Linux > >>> box, I decided to look into why this is. As it turns out, most people > >>> get git binaries from http://code.google.com/p/git-osx-installer/, > >>> which are 32-bit. Switching to 64-bit binaries made git status go from > >>> 6.58s to 2.50s (mainly because this does fewer mmaps). > >>> > >>> You can download a 64-bit binary installer from > >>> > https://github.com/downloads/mihaip/git_osx_installer/git-1.7.3.3-intel-x86_64-leopard.dmg > , > >>> or you can build it yourself (more details at > >>> > http://blog.persistent.info/2010/12/making-git-faster-on-large-repositories.html > ). > >>> > >>> Mihai > >>> _______________________________________________ > >>> webkit-dev mailing list > >>> [email protected] > >>> http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev > >> > > > _______________________________________________ > webkit-dev mailing list > [email protected] > http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev >
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