On Wednesday 04 November 2009 13:49:54 Mel Flynn wrote:
> Using env MALLOC_OPTIONS= also has no impact at all (just in case defaults
> aren't that). Since fgrep is fast and basically seeds the cache for grep,
> I'm ruling out disks/io reads. In fact, /tmp on this laptop is memory disk
> (one reason I couldn't go up to 64M :)). I honestly can't figure out what
> my 'local problem' could be or your optimization.
It hit me. Rather then a local problem, it's a locale problem:
=>>> 16777216
=>>> en_US.UTF-8
=>>> fgrep
0.04 real 0.04 user 0.00 sys
0.04 real 0.02 user 0.02 sys
0.02 real 0.01 user 0.00 sys
=>>> grep
0.04 real 0.04 user 0.00 sys
3.74 real 3.55 user 0.02 sys
1.95 real 1.83 user 0.03 sys
=>>> en_US.ISO8859-1
=>>> fgrep
0.04 real 0.04 user 0.00 sys
0.04 real 0.03 user 0.00 sys
0.02 real 0.01 user 0.01 sys
=>>> grep
0.05 real 0.03 user 0.00 sys
0.05 real 0.04 user 0.00 sys
0.08 real 0.04 user 0.03 sys
=>>> en_US.US-ASCII
=>>> fgrep
0.04 real 0.01 user 0.02 sys
0.05 real 0.03 user 0.01 sys
0.02 real 0.00 user 0.02 sys
=>>> grep
0.04 real 0.03 user 0.00 sys
0.05 real 0.03 user 0.00 sys
0.08 real 0.06 user 0.01 sys
--
Mel
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