New stat stuff (was [PATCH] improve performance of stat() ope rations (e.g. ls -lR ))

[Don Bowman]

> On Tue, May 28, 2002 at 10:25:37PM -0400, Christopher Faylor wrote:
> >On Tue, May 28, 2002 at 09:58:52PM -0400, Don Bowman wrote:
> >>
> >>So I've performed a mini-benchmark of Chris' changes.
> >>
> >>I did a ls -lR >/dev/null of the cygwin source tree on my
> >>notebook.
> >>
> >>Baseline (current setup.exe install): 1m14.9s
> >>'statquery' patch I sent earlier: 4.081s
> >>Current CVS tree: 3.718s
> >>Current CVS tree w/ -E switch to mount: 3.711s
> >>Current CVS tree w/ -X switch to mount: 3.716s
> >>
> >>Not all that scientific, I ran each twice, took the 2nd timing.
> >>So, looks good, excellent work. I still don't see any 
> >>difference on the -E or the -X tho'.
> >
> >That has got to mean that there's something wrong in the stat
> >logic.  I didn't do anything to speed up the normal case, AFAIK,
> >unless you're doing this on a FAT/FAT32 partition.
> 
> Actually, even in that case, it shouldn't make that big a deal.

Its the anti-virus. Your change no longer opens the file for read,
so the anti-virus doesn't do anything, thus the enormous difference.
As to why the negligible difference between -E/-X/nothing, no
idea.