On Sun, 20 Apr 2008, Pieter de Bie wrote: > > The number of lstats are cut down by your patch: 428761 vs. 338091. Funnily > enough, there is no significant difference in run-time: It may be that the problem with OS X is a sucky pathname cache mechanism. The trivial patch cut down the number of stat() calls by a fair amount, but the calls that got removed were all of the "do two 'lstat()' calls on the exact same pathname consecutively" type. Maybe OS X has some very limited pathname caching that catches that, or even if not, it just ends up being very nice in the D$, so it's not a big deal. And then the real suckiness happens only with bigger workloads. It may also be that the bulk of the OS X cost isn't in lstat() at all, but in the VM. That was true for some other OS X load. > Command Mean Std > git status . 13.970 1.298 > /Users/pieter/projects/External/git/git-status . 13.759 0.321 This is the WebKit archive, right? For me, doing a "time git status ." on the WebKit thing I just cloned from git://git.webkit.org/WebKit.git is much faster: 1.264s (and it goes down by maybe 5-10% with my lstat-avoidance patch). Is there any system-level profiler for OS X to get a clue where that cost is, in case it's not the lstat() at all? Linus -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
