Cygwin Filesystem Performance degradation 1.7.5 vs 1.7.7, and methods for improving performance

Yoni Londner
Thu Oct 7 13:16:00 GMT 2010


Sorry for my prev email (I noticed your 2 emails only after I sent it) 
and for top posting.

 > 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


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