Re: Slow execution of my build of grep

[eo rojas]

I thought I would try sending this once more now that I am getting messages
from the list.


On 7/26/07, eo rojas <address@hidden> wrote:
>
>
> I apologize if this is covered somewhere, but as is typical for GNU stuff
> I have looked around and not found the info.  I built my own grep by pulling
> down the source  but my version runs many times times slower on a very large
> file I am grepping.  I did not install it, but I am running it out of build
> directory.
> After running ./configure I had CFLAGS with -g -O2, which I tried changing
> to -O3, to no avail.
>
> Here is the verision info:
> ---
>  mygrep --version
> grep (GNU grep) 2.5
>
> Copyright 1988, 1992-1999, 2000, 2001 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions. There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
> PURPOSE.
>
> ----
> grep --version
> grep (GNU grep) 2.5.1
>
> Copyright 1988, 1992-1999, 2000, 2001 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions. There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
> PURPOSE.
> ----
> Here is a make output line for grep.c after I change to "-O3"
> gcc -DHAVE_CONFIG_H -I. -I. -I.. -I../intl -I../lib
> -DLOCALEDIR=\"/usr/local/share/locale\"    -O3 -c `test -f grep.c || echo
> './'`grep.c
> -----
>
> What I was trying to do.
>
> I commonly want to pass a very long list of files to grep.  I use find to
> generate a list of files but I also filter these to exclude some paths.  The
> list is fairly static.  I understand I could use the new options --include,
> and --exclude options along with --recurse to get the same effect, but I
> want to use this list directly.  So I pulled down the code to see how
> difficult this feature would be to add, it is looks very easy to do except
> for this performance issues.
>
> Thanks,
> emilio
>
> --
> ------
> emilio




-- 
------
emilio