Vyhledani 0 grepem
Martin `MJ' Mares
mj na ucw.cz
Středa Září 6 14:39:29 CEST 2006
Zdravim!
> Zkousel jsem schvalne (na jizlive popichovani kolegu) merit performance
> hit pri pouzity "zbytecne" kocky, a kupodivu je tento hit na mnou
> merenych pripadech 0 (cti nemeritelny), nekdy dokonce -1 (cti
> performance gain). Neprovadel jsem zadna dukladna mereni, proste jen par
> beznych pripadu na ruzne velkych vstupech.
Nevim, jak jste meril Vy, ale mne jednoduchy experiment dava vysledky
presne opacne:
| mares na camellia:/tmp$ seq 1 10000000 >t
| mares na camellia:/tmp$ l t
| -rw-r--r-- 1 mares kam 113788806 Sep 6 14:37 t
| mares na camellia:/tmp$ time grep blabla t
|
| real 0m0.166s
| user 0m0.088s
| sys 0m0.068s
| mares na camellia:/tmp$ time grep blabla t
|
| real 0m0.164s
| user 0m0.088s
| sys 0m0.068s
| mares na camellia:/tmp$ time grep blabla t
|
| real 0m0.164s
| user 0m0.084s
| sys 0m0.076s
| mares na camellia:/tmp$ time cat t | grep blabla
|
| real 0m0.298s
| user 0m0.124s
| sys 0m0.172s
| mares na camellia:/tmp$ time cat t | grep blabla
|
| real 0m0.296s
| user 0m0.080s
| sys 0m0.212s
| mares na camellia:/tmp$ time cat t | grep blabla
|
| real 0m0.296s
| user 0m0.092s
| sys 0m0.200s
| mares na camellia:/tmp$
Tedy kocici verze je konsistentne 1.8-krat pomalejsi.
Have a nice fortnight
--
Martin `MJ' Mares <mj na ucw.cz> http://atrey.karlin.mff.cuni.cz/~mj/
Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth
"This quote has been selected randomly. Really." -- M. Ulrichs
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