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Re: Cygwin Filesystem Performance degradation 1.7.5 vs 1.7.7, and methods for improving performance
On Oct 7 15:17, Yoni Londner wrote:
> Hi,
>
> Sorry for my prev email (I noticed your 2 emails only after I sent
> it) and for top posting.
No worries.
> > Actually, I can't reproduce it at all. I just created a patch which
> > drops the GENERIC_READ and only opens the symlinks with it, just as
> > proposed. The results between the two versions are statistically
> > identical.
>
> I did a little investigation to find out why you can't reproduce it.
> I found that the cause it is so slow on my computer is NOD32 AV (as
> all the computers in my company).
> When i disable it, I got the results you got.
>
> So, I looked for computers with different AV software and found two,
> one with Symantec, and one with Mcafee.
> Symantec was even slower:
> 3592 files stat() 4023ms, per file: 1.1201ms
> Mcafee more or less was the same:
> 3592 files stat() 3425ms, per file: 0.9535ms
> My computer (NOD32):
> 3592 files stat() 3353ms, per file: 0.9333ms
So, there's a good reason I hate virus scanners. I'll check in my
patch then since it seems to be a good idea for all users which are
forced to use them.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat
- References:
- Re: Cygwin Filesystem Performance degradation 1.7.5 vs 1.7.7, and methods for improving performance
- Re: Cygwin Filesystem Performance degradation 1.7.5 vs 1.7.7, and methods for improving performance
- Re: Cygwin Filesystem Performance degradation 1.7.5 vs 1.7.7, and methods for improving performance
- Re: Cygwin Filesystem Performance degradation 1.7.5 vs 1.7.7, and methods for improving performance
- Re: Cygwin Filesystem Performance degradation 1.7.5 vs 1.7.7, and methods for improving performance
- Re: Cygwin Filesystem Performance degradation 1.7.5 vs 1.7.7, and methods for improving performance
- Re: Cygwin Filesystem Performance degradation 1.7.5 vs 1.7.7, and methods for improving performance
- Re: Cygwin Filesystem Performance degradation 1.7.5 vs 1.7.7, and methods for improving performance
- Re: Cygwin Filesystem Performance degradation 1.7.5 vs 1.7.7, and methods for improving performance
- Re: Cygwin Filesystem Performance degradation 1.7.5 vs 1.7.7, and methods for improving performance