linux.redhat.misc-great_grep_slowdown__istheredhatdef

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From: mattdm@mattdm.org (Matthew Miller)
Newsgroups: linux.redhat.misc
Subject: Re: What's happened to grep?
Date: 18 Feb 2003 18:47:28 GMT

Ryan R. Frederick <bob@k7hosting.com_> wrote:
>> Is it just my imagination or has grep become
>> incredibly slow with Redhat 8?
>It's just your imagination... grep works fine for me.

Actually, it's not necessarily his imagination. It's much much slower in
UTF-8 mode, which RHL 8 uses by default.

# export LANG=C
# time grep foobar lastlog > /dev/null 2>&1

real    0m0.617s
user    0m0.340s
sys     0m0.230s

# export LANG=en_US.UTF-8 
# time grep foobar lastlog > /dev/null 2>&1

real    0m4.704s
user    0m4.370s
sys     0m0.280s

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From: Ivan Marsh <annoyed@you.now>
Newsgroups: linux.redhat.misc
Subject: Re: What's happened to grep?
Date: Tue, 18 Feb 2003 14:54:12 -0600

Matthew Miller wrote:

> Ryan R. Frederick <bob@k7hosting.com_> wrote:
>>> Is it just my imagination or has grep become
>>> incredibly slow with Redhat 8?
>>It's just your imagination... grep works fine for me.
> 
> Actually, it's not necessarily his imagination. It's much much slower in
> UTF-8 mode, which RHL 8 uses by default.
> 

What is UTF-8 mode anyway? It's one of the first things I changed about my 
RH8 box since nothing was displaying correctly. What is it supposed to buy 
you to be running it?

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From: mattdm@mattdm.org (Matthew Miller)
Newsgroups: linux.redhat.misc
Subject: Re: What's happened to grep?
Date: 18 Feb 2003 21:20:39 GMT

Ivan Marsh <annoyed@you.now> wrote:
>What is UTF-8 mode anyway? It's one of the first things I changed about my 
>RH8 box since nothing was displaying correctly. What is it supposed to buy 
>you to be running it?

<http://www.cl.cam.ac.uk/~mgk25/unicode.html>

In short -- lets you use international characters in a sane way.

===


From: "Taso Hatzi" <TASO@ESANDSpadpadpadpad.COM>
Newsgroups: linux.redhat.misc
Subject: Re: What's happened to grep?
Date: Wed, 19 Feb 2003 20:03:57 +1100

Matthew Miller wrote:

> Ryan R. Frederick <bob@k7hosting.com_> wrote:
>>> Is it just my imagination or has grep become
>>> incredibly slow with Redhat 8?
>>It's just your imagination... grep works fine for me.
> 
> Actually, it's not necessarily his imagination. It's much much slower in
> UTF-8 mode, which RHL 8 uses by default.

That was it. Got rid of UTF and grep is back to normal.
What a bummer for people who need UTF.

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From: X01_Coo@nada.kth.se (Robcos)
Newsgroups: linux.redhat.misc
Subject: Re: What's happened to grep?
Date: 20 Feb 2003 04:21:20 -0800

Note that this happens with grep 2.5.1
With the old grep  2.4.2 of red hat 7.1 the problem doesn't occur.
Probably it doesn't care about utf settings.

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