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From: Matthew Gregan <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: grep: unusually high memory use with '-o' option
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Date: Mon, 08 Nov 2004 11:13:02 +1300
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Package: grep
Version: 2.5.1.ds1-3.2
Severity: normal
The '-o'/'--only-matching' option of grep(1) causes unusually high
memory use. For example, I have a test file of 52kB, which contains
approximately 30k matches:
$ ls -la data
-rw-r--r-- 1 kinetik kinetik 53143 2004-11-08 11:00 /home/kinetik/data
$ /usr/bin/time grep -o A < data | wc -l
62.09user 0.63system 1:02.80elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+133427minor)pagefaults 0swaps
30043
top(1) indicated that the grep process reached a peak RSS of 514MB.
I'm aware that this is expected to be a somewhat inefficient use of
grep, but after I discovered the extent of this high memory use
behaviour, I thought it was probably worth reporting as a bug.
Cheers,
-mjg
-- System Information:
Debian Release: 3.1
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.6.9-rc4
Locale: LANG=en_NZ.UTF-8, LC_CTYPE=en_NZ.UTF-8
Versions of packages grep depends on:
ii libc6 2.3.2.ds1-18 GNU C Library: Shared libraries an
-- no debconf information
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Date: Sat, 10 Dec 2005 23:06:16 -0500
To: [EMAIL PROTECTED]
Subject: Re: SPAM: Bug#280187: grep
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From: Justin Pryzby <[EMAIL PROTECTED]>
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Version: 2.5.1-ds2-3
On Sun, Dec 11, 2005 at 05:09:08PM +1300, Matthew Gregan wrote:
> At 2005-12-10T20:39:59-0500, Justin Pryzby wrote:
> > Could you confirm that this bug is fixed at least in grep-2.5.1.ds2-4?
> >
> > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=280187
> >
> > Thanks.
>
> Confirmed with 2.5.1-ds2-3 and 2.5.1-ds2-4.
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