"Shawn O. Pearce" <spearce@spearce.org> writes:

quoted text
> Junio C Hamano <junkio@cox.net> wrote:
>> I doubt it -- sliding mmap() in the current git, while is a good
>> change overall for handling really huge repos, would most likely
>> perform poorer than the fixed mmap() in 1.4.4 series on
>> platforms with slow mmap(), most notably on MacOS X.
>> 
>> It _might_ be possible that turning some sliding mmap() calls
>> into pread() makes it perform better on MacOS X.
>> 
>> I wonder what happens it git is compiled with NO_MMAP there...
>
> So I ran three trials, v1.5.0-rc4-26-gcc46a74 with and without
> NO_MMAP against v1.4.4.4 on a freshly repacked git.git.

I do not think freshly repacked git.git is a good test case for
a real-world workload where this really matters.  Doesn't your
default pack window large enough to cover it with a single
window, or perhaps two at most?



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