Mail Archives: cygwin/2009/11/06/08:48:13
On Fri, Nov 06, 2009 at 02:09:59PM +0100, Thomas Wolff wrote:
>Christopher Faylor wrote:
>> On Thu, Nov 05, 2009 at 07:11:02PM -0800, Linda Walsh wrote:
>>
>>> 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 AT gnu DOT org mailing list, but last time I did, they told me
>>> "that's the way it is" due to some posix conformance thing...
>>>
>>
>> The fact that it behaves differently between Cygwin 1.5 and 1.7 would
>> suggest that this isn't a grep problem.
>>
>This is likely to be triggered by the transition to UTF-8 as a default
>charset. The same problem is observed on Linux, with grep as well as
>with sed.
>That's why I have changed most of my shell scripts to use something like
>LC_ALL=C grep or LC_ALL=C sed
>where possible. Please try this.
Thanks for catching this. I'll hold off on trying the test case until I
hear a report about running the same test with LC_ALL=C.
cgf
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