Re: [PATCH 3/3] Avoid doing extra 'lstat()'s for d_type if we have an up-to-date cache entry

On Fri, Jul 10, 2009 at 01:05:13AM +0400, Dmitry Potapov wrote:

There is one strange thing though. Before that patch the number of
'open' for each directory was always the same in each run. But after
that patch, it slightly differs in each run... Comparing with results
without this patch, the number of open for some directories in some
be less by one... which is puzzling...

It appears that is a purely Windows thing... It seems extra opens for
directories inside of the working tree are caused by Windows Prefetcher.
http://en.wikipedia.org/wiki/Prefetcher

Accordingly to the Process Monitor, during start-up, it opens and reads
most directories in the repo that have subdirectories but sometimes it
skips some of them... So, the patch works as expected... Perhaps, I
should disable this prefetcher for testing to get more reproduceable
results. Anyway, this prefetecher does not issue QueryOpen (stat) for
files in the repo, so my numbers for 'stat' are not affected by it.


Dmitry