lkml.org 
[lkml]   [1999]   [Jun]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
Subjectre: Linux and Apache performance, Update
Juergen,
thanks for keeping us informed!

First:
I saw one possible problem straight off:
you compiled Apache with
-D USE_FCNTL_SERIALIZED_ACCEPT
To get the benefit of the wake-one kernel patches,
you have to compile instead with
-DSINGLE_LISTEN_UNSERIALIZED_ACCEPT

As far as I know, the way you compiled Apache,
the kernel is still waking up all processes
("the thundering herd") when it should only
be waking up one. This hurts SMP performance.

Please have a look at the section "Suggestions
for future benchmarks" in
http://www.kegel.com/mindcraft_redux.html

Second: I see your load generating program uses
multiple processes, and you mention that it can't
generate enough load to really hit an SMP server hard.
Perhaps you should try a different load client, e.g.
http://www.acme.com/software/http_load/ It
might be able to load your server down more effectively.

Thanks,
Dan

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:52    [W:0.056 / U:0.360 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site