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Re: 1.7] BUG - GREP slows to a crawl with large number of matches on a single file
- From: Linda Walsh <cygwin at tlinx dot org>
- To: cygwin at cygwin dot com
- Date: Thu, 05 Nov 2009 19:11:02 -0800
- Subject: Re: 1.7] BUG - GREP slows to a crawl with large number of matches on a single file
- References: <26224019.post@talk.nabble.com>
aputerguy wrote:
Running grep on a 20MB file with ~100,000 matches takes an incredible almost
8 minutes under Cygwin 1.7 while taking just 0.2 seconds under Cygwin 1.5
(on a 2nd machine).
---
I've seen nasty behavior with grep that isnt' cygwin
specific. Try "pcregrep" and see if you have the same issue.
I found it to be about ~100 times faster under _some_ searches
though 2-3x is more typical. The gnu re-parser isn't real
efficient under some circumstances.
If you find a big difference, you might also want to report
it to the bug-grep@gnu.org mailing list, but last time I did,
they told me "that's the way it is" due to some posix conformance
thing...
-l
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