lkml.org 
[lkml]   [2002]   [Oct]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH] Re: Shared memory shmat/dt not working well in 2.5.x
Date
> I also observed that other application I use occasionally - LXR (Linux
> source cross referencing tool) - takes much longer to generate xref
> database (which is in Berkeley DB files). It works in three passes,
> where the last one, when it dumps symbols into DB, is interesting. In
> 2.4 it finishes quickly (it uses 100% CPU, then occasionally syncs the
> databases - heavy write traffic for a second - then continues), but
> 2.5 has problems with it (it stucks writing to disk all the time, CPU
> usage is minimal and process progresses very slowly). Andrew, if
> you're interested I can send you some numbers to describe the case
> better.

Hmmm, are you using ext3? Changes to the meaning of yield sometimes
make fsync go very slowly. This problem has been around since 2.5.28,
and hasn't yet been fixed (As for a fix, Andrew Morton said "I'll sit tight for
the while, see where shed_yield() behaviour ends up").

All the best,

Duncan.
-
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/

\
 
 \ /
  Last update: 2005-03-22 13:29    [W:0.085 / U:0.200 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site