climateprediction.net home page
Won\'t run multi processors

Won\'t run multi processors

Questions and Answers : Preferences : Won\'t run multi processors
Message board moderation

To post messages, you must log in.

AuthorMessage
old_user13650

Send message
Joined: 6 Sep 04
Posts: 1
Credit: 374,285
RAC: 0
Message 5862 - Posted: 2 Nov 2004, 8:32:42 UTC

I have 2 computers. My home pc only has one processor, and that seems fine. My work pc has 2 processors. Originally both were running. Now only one gets run and the other has a status of \'Preempted\'. On my preferences I state to use at most 2 processors. What else could it be?
ID: 5862 · Report as offensive     Reply Quote
Profile Thyme Lawn
Volunteer moderator

Send message
Joined: 5 Aug 04
Posts: 1276
Credit: 15,546,782
RAC: 0
Message 5865 - Posted: 2 Nov 2004, 11:08:12 UTC

It looks to me like your system used to have hyper-threading enabled in the BIOS but has been rebooted with the option disabled, Stuart.

Result id 148186 stopped trickling on 12th October, and since then the seconds per timestep for <a href="http://climateapps2.oucs.ox.ac.uk/cpdnboinc/trickle.php?resultid=148184">result id 148184</a> has been going steadily down. CPDN will calculate 2 models about 15% faster with HT enabled.

You can quickly tell if HT is enabled or disabled by running task manager and clicking on the performance tab. If you've got 2 graphs displayed in the CPU usage history section HT is enabled, otherwise it's disabled.
<br><a href="http://www.teampicard.net"><img src="http://www.teampicard.net/templates/fisubice/images/phpbb2_logo.jpg"></a><a href="http://climateapps2.oucs.ox.ac.uk/cpdnboinc/team_display.php?teamid=3">Join us here</a>
ID: 5865 · Report as offensive     Reply Quote
old_user169

Send message
Joined: 5 Aug 04
Posts: 39
Credit: 87,633
RAC: 0
Message 5880 - Posted: 3 Nov 2004, 5:24:53 UTC - in response to Message 5865.  
Last modified: 3 Nov 2004, 5:34:19 UTC

&gt; It looks to me like your system used to have hyper-threading enabled in the
&gt; BIOS but has been rebooted with the option disabled, Stuart.


Wouldn't the host status page say "Number of CPUs : 1" then?


Could be a "Venue" problem too, if @Home is set to use only 1 CPU and the Xeon used to be @Work but switched to @Home for some reason (the Venue setting sometimes gets lost)

In this case it would be safer to set it to 2 CPUs @Home too
ID: 5880 · Report as offensive     Reply Quote

Questions and Answers : Preferences : Won\'t run multi processors

©2019 climateprediction.net