grep

[rogerio . a . santos]

Dear developer,

I had upgraded my operation system from RedHat 6.1 with kernel 2.2 to
RedHat Enterprise Edition 4 with kernel 2.6  and I had a  big
performance decrease in "grep" utilitary.


Using the grep ditribution package rpm of operation system (2.5.1) a had
the follow result;
3 minutes 28 seconds --> time cut -c1-2 file.tmp  | grep -c "^01" | awk
'{printf("%.6d",$1)}'

Using the grep source compiled of gnu.org (2.5.1a) a had the follow result:
 2 minutes 36 seconds --> time cut -c1-2 file.tmp  | grep -c "^01" | awk
 '{printf("%.6d",$1)}'

Using the grep  from  the old operation system (2.3) a had the follow
 result:
 0 minutes 05 seconds --> time cut -c1-2 file.tmp  | grep -c "^01" | awk
 '{printf("%.6d",$1)}'

I wold like to know if this strong diference is normal for these diferents
versions ?

Regards,



Rogério de Alencar Santos
CCS - Sistemas
RR Donnelley Moore
Tel (55 11) 2104-4318
www.rrdmoore.com.br