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slow grep
From: |
Aaron Holtzman |
Subject: |
slow grep |
Date: |
Wed, 13 Nov 2002 15:50:00 -0800 |
User-agent: |
Mutt/1.2.5i |
[posted to both glibc and gnu-utils as the problem may be in either]
Using grep-2.5.1 / glibc-2.2.93-5 (RedHat 8) I see a very large
performance degradation for the following search pattern.
wilder:/tmp$ time grep -E ' +[0-9]+' test_input > /dev/null
real 0m2.334s
user 0m2.330s
sys 0m0.002s
For reference, the same test done on another (slower) machine, with
grep-2.4.2 and glibc-2.2.4-30 (RedHat 7.3).
kurosawa:/tmp$ time grep -E ' +[0-9]+' test_input > /dev/null
real 0m0.004s
user 0m0.000s
sys 0m0.000s
I've attached the test_input file for your convenience.
cheers,
aaron
test_input.gz
Description: application/gunzip
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