On Sun, Feb 10, 2013 at 8:26 PM, demerphq <demerphq@xxxxxxxxx> wrote:
> On 10 February 2013 12:17, Duy Nguyen <pclouds@xxxxxxxxx> wrote:
>> Bear in mind though this is Linux, where lstat is fast. On systems
>> with slow lstat, these timings could look very different due to the
>> large number of lstat calls compared to open+getdents. I really like
>> to see similar numbers on Windows.
>
> Is windows stat really so slow?
I can't say. I haven't used Windows for months (and git on Windows for years)..
> I encountered this perception in
> windows Perl in the past, and I know that on windows Perl stat
> *appears* slow compared to *nix, because in order to satisfy the full
> *nix stat interface, specifically the nlink field, it must open and
> close the file*. As of 5.10 this can be disabled by setting a magic
> var ${^WIN32_SLOPPY_STAT} to a true value, which makes a significant
> improvement to the performance of the Perl level stat implementation.
> I would not be surprised if the cygwin implementation of stat() has
> the same issue as Perl did, and that stat appears much slower than it
> actually need be if you don't care about the nlink field.
The native port of git uses get_file_attr (in
compat/mingw.c:do_lstat()) to simulate lstat and always sets nlink to
1. I assume this means git does not care about nlink field. I don't
know about cygwin though.
> Yves
> * http://perl5.git.perl.org/perl.git/blob/HEAD:/win32/win32.c#l1492
--
Duy
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