Semetric processing and TOP.

Phil Hannent philip at
Wed Sep 22 13:38:01 UTC 2004

Hash: SHA1

Neil Marjoram wrote:
| Doh! Hmmm, I will check this setting in Bios when the user has finished.
| Thanks,
| Neil.
| On Wed, 2004-09-22 at 11:31, Markku Kolkka wrote:
|>Neil Marjoram kirjoitti viestissään (lähetysaika keskiviikko, 22.
|>syyskuuta 2004 12:59):
|>>I have just commissioned a 2 x Xeon 2.8Ghz 512MB 533Mhz FSB
|>>compute node for research work.
|>>Also I note from the output from top that the two processes
|>>each consume 99.9% of CPU, but the total user at the top is
|>>50%, and the idle is 50%.
|>The CPUs are hyperthreaded and the OS sees them as four CPUs.
|> Markku Kolkka
|> markku.kolkka at

I would also check in the BIOS if ECC checking is happening in the RAM
and/or the CPU cache.  High end servers tend to have this enabled to
prevent errors in memory, but can lead to a slow down.

The following faq give a little reasoning behind it (to the bottom):

I am not saying this is the cause just something to investigate, I would
suspect that it is something to do with the transfer from memory to CPU
that is causing a slow down.

- --
Phil Hannent

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