--5QAgd0e35j3NYeGe
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
On Tue, Jan 28, 2003 at 10:09:47AM -0500, Mike Mettke wrote:
> Hi,
>=20
> We are using Oscar 1.4 on Redhat 7.3 quite happily. For the compute=20
> nodes we're using dual xeon cpus on westville motherboards. Now, those=20
> cpus have hyperthreading, making ganglia report those nodes as having 4=
=20
> cpus.
> Since we're limiting the number of jobs to 2 per node via PBS/maui, this=
=20
> means that the cluster load as displayed by ganglia can never be more=20
> than 50%. This has lead to questions from management regarding effective=
=20
> resource usage. Is there any way to adjust ganglia such that those=20
> calculations are based on 2 cpus per node ?
If you have hyperthreading enabled in Linux, the entire OS sees double when
it comes to processors, and will schedule processes accordingly. If you
want to continue to limit jobs to 2 per node, I would turn off
hyperthreading (there is a runtime kernel option to do this I think...
though I can't remember it). Otherwise you may get the linux scheduler
putting both running processes on the same chip, which will be bad for your
throughput. So the issue is to change what the OS sees, not what ganglia
sees. Changing what ganglia sees is just changing a symptom, not the root
cause.
-Sean
--=20
_______________________________________________________________________
=09
Sean Dague [EMAIL PROTECTED] http://dague.net
There is no silver bullet. Plus, werewolves make better neighbors than
zombies, and they tend to keep the vampire population down.
_______________________________________________________________________
--5QAgd0e35j3NYeGe
Content-Type: application/pgp-signature
Content-Disposition: inline
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org
iD8DBQE+NqTbSamXem9TdyYRAv06AJ4wifbFvU+9XrF0eyGFy9mM7AWhhACePnr6
86efU9OxVyrrQynywn+vzR8=
=ZJkP
-----END PGP SIGNATURE-----
--5QAgd0e35j3NYeGe--
-------------------------------------------------------
This SF.NET email is sponsored by:
SourceForge Enterprise Edition + IBM + LinuxWorld = Something 2 See!
http://www.vasoftware.com
_______________________________________________
Oscar-users mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/oscar-users
