Messages in this thread | | | Date | Fri, 26 Aug 2005 18:27:03 +0200 | From | Diego Calleja <> | Subject | Re: extremely slow disk access due to mremap? |
| |
El Fri, 26 Aug 2005 17:09:58 +0200, Justin Heesemann <jh@ionium.org> escribió:
> finally i found a good reproducable way to test this behavior: > > # time grep ^....$ /usr/share/dict/words > /dev/null > > real 0m7.728s > user 0m7.713s > sys 0m0.011s
The problem seems (IMO) to be in userspace, your software seems to be doing too much stuff for no good reason. If grep calls mremap() too many times that's their problem; and even if it's doing that, the kernel is doing the mremap() stuff quite fast
> the funny thing is: if i don't grep for a regexp, it's working fine: > # grep asdf /usr/share/dict/words [...] > since right now i'm out of ideas what to look for next, could you please > help me?
Maybe a bug in the regexp code in your /bin/grep? Are you using different distro/versions in your two boxes?
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |