[debbugs-tracker] bug#16893: closed ([PATCH] Avoid matching line-by-line for case-insensitive with grep)

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Your message dated Fri, 28 Feb 2014 22:26:36 -0800
with message-id <address@hidden>
and subject line Re: bug#16893: [PATCH] Avoid matching line-by-line for 
case-insensitive with grep
has caused the debbugs.gnu.org bug report #16893,
regarding [PATCH] Avoid matching line-by-line for case-insensitive with grep
to be marked as done.

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16893: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=16893
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--- Begin Message --- Subject: [PATCH] Avoid matching line-by-line for case-insensitive with grep Date: Fri, 28 Feb 2014 01:02:40 +0900

Now grep and awk matchers doesn't waste buffer in case-sensisitive matching.
So I think that we can avoid line-by-line matching for them.

It enable to speed up case-sensitive matching with grep or awk matcher
without trivial_case_ignore as fast as when with it.

In bug#16232:
> The following times 2.16, 2.17 and 2.17+patch two ways:
> 
> $ yes jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj | head -10000000 > k
> $ for i in 16 17 18; do echo $i; env LC_ALL=en_US.UTF-8 time
> /p/p/grep-2.$i/bin/grep -i foobar k; done
> 16
>        15.96 real        14.57 user         0.12 sys
> 17
>         1.13 real         1.07 user         0.06 sys
> 18
>         1.96 real         1.89 user         0.06 sys
> 
> The above search takes more than 70% longer with the proposed patch.

Therefore, I think 30% slow-down is caused by the line-by-line matching
for them.

avoid_line_by_line.txt
Description: Binary data

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> Subject: 
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> Re: bug#16893: [PATCH] Avoid matching line-by-line for case-insensitive with grep
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> Date: 
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> Fri, 28 Feb 2014 22:26:36 -0800
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> User-agent: 
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> Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0
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> Thanks, I applied that.  It simplifies another patch I've been meaning 
> to put in, yay!
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