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bug#22357: grep -f not only huge memory usage, but also huge time cost
From: |
JQK |
Subject: |
bug#22357: grep -f not only huge memory usage, but also huge time cost |
Date: |
Thu, 10 Mar 2016 19:00:44 +0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
If in the following situation,
===========
file1 has numbers from 1 to 200000, 200000 lines
file2 has several lines(about 200 ~300lines) of random numbers in the
range of 1-200000
===========
The time cost for finishing the following command could be over 15
minutes on linux -- a little huge.
$ grep -v -f file1 file2
(FYI, on AIX it could only be less than 1 second)
Maybe there is also a room for optimization not only on the memory usage
but also on the time cost.
--
Junkui Quan (JQK)
www.redhat.com
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- bug#22357: grep -f not only huge memory usage, but also huge time cost,
JQK <=
- bug#22357: grep -f not only huge memory usage, but also huge time cost, Jim Meyering, 2016/03/10
- bug#22357: grep -f not only huge memory usage, but also huge time cost, JQK, 2016/03/11
- bug#22357: grep -f not only huge memory usage, but also huge time cost, Jim Meyering, 2016/03/11
- bug#22357: grep -f not only huge memory usage, but also huge time cost, JQK, 2016/03/14
- bug#22357: grep -f not only huge memory usage, but also huge time cost, Norihiro Tanaka, 2016/03/14
- bug#22357: grep -f not only huge memory usage, but also huge time cost, Bruce Dubbs, 2016/03/14