Am 16.10.2013 00:22, schrieb pro-logic: > I also get fairly slow performance out of the checkout / reset > operations on windows. > > This discussion got me trying to work out what's taking so long on > windows. To help I used killcache [1] to flush the HDD cache and > Very Sleepy [2] to profile the code. I couldn't use the > GIT_TRACE_PERFORMANCE [3] patch as that seems to only work on script > commands, and in my case I just get a result of "335 seconds git > reset --hard head" from the log. The trace_performance functions require manual instrumentation of the code sections you want to measure, e.g. like this [1]. Output looks like this for a full WebKit checkout (Win7 x64, Core i7 860, WD VelociRaptor 300, NTFS, no virus scanner, no luafv, no defragger): trace: at entry.c:128, time: 135.786 s: write_entry::create trace: at entry.c:129, time: 101.6 s: write_entry::stream trace: at entry.c:130, time: 0 s: write_entry::read trace: at entry.c:131, time: 0 s: write_entry::convert trace: at entry.c:132, time: 0 s: write_entry::write trace: at entry.c:133, time: 4.71825 s: write_entry::close trace: at compat/mingw.c:2150, time: 5.68786 s: mingw_lstat (called 661660 times) trace: at compat/mingw.c:2151, time: 259.219 s: command: c:\git\msysgit\git\git-checkout.exe -f HEAD > After running killcache I ran very sleepy connected to git, and > according to the profile: 95.5% of the time is spent in do_lstat > (mingw.c) / NtQueryFullAttributeFile (ntdll) Very Sleepy confirmed my numbers from above: lstat was always much smaller than create/stream/read/write. Could you post details about your test setup? Are you still using WebKit for your tests? > For fun, not knowing if I would break anything or not (it probably > does), I wrapped the entire unpack_trees method in the fscache [4] > and the total git reset --hard head time fell from 335 seconds to 28 > seconds, a 11x improvement. Hmmm...this doesn't work for me at all. Fscache isn't updated during checkout, so lstat-checks whether creating a file or directory succeeded will fail. $ git config core.fscache true $ time git checkout -f HEAD Unlink of file 'Examples' failed. Should I try again? (y/n) n warning: unable to unlink Examples: Permission denied fatal: cannot create directory at 'Examples': Permission denied Karsten [1] https://github.com/kblees/git/commit/b8eca278 -- 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