HT on or off?


log in

Advanced search

Message boards : Number crunching : HT on or off?

Author Message
Mahbubur
Send message
Joined: 6 Apr 06
Posts: 10
Credit: 6,760
RAC: 0
United Kingdom
Message 302216 - Posted: 10 May 2006, 23:37:33 UTC

I'm fairly new to DC, but should i have hyperthreading on or off when crunching?
____________

Profile Geek@Play
Volunteer tester
Avatar
Send message
Joined: 31 Jul 01
Posts: 2460
Credit: 83,854,400
RAC: 29,806
United States
Message 302220 - Posted: 10 May 2006, 23:49:03 UTC

In life there are many truths.

Faster is better..........
Bigger is better..........
HT on is better...........


____________
Boinc....Boinc....Boinc....Boinc....

Mahbubur
Send message
Joined: 6 Apr 06
Posts: 10
Credit: 6,760
RAC: 0
United Kingdom
Message 302221 - Posted: 10 May 2006, 23:50:27 UTC - in response to Message 302220.

In life there are many truths.

Faster is better..........
Bigger is better..........
HT on is better...........



lol, ok thx
____________

Profile Changeling
Send message
Joined: 24 May 99
Posts: 20
Credit: 11,475,414
RAC: 0
United States
Message 302223 - Posted: 11 May 2006, 0:00:47 UTC
Last modified: 11 May 2006, 0:02:28 UTC

One thing to consider, if the computer is a laptop with a p4 intel chip, you may get overheating problems. My fastest cruncher is a laptop, when I turn on HT, it gets way too hot, and the fan screams all the time. I leave it off. Just my opinion. :-)

Profile Crunch3r
Volunteer tester
Avatar
Send message
Joined: 15 Apr 99
Posts: 1540
Credit: 3,313,044
RAC: 369
Germany
Message 302234 - Posted: 11 May 2006, 0:21:14 UTC - in response to Message 302220.

In life there are many truths.

Faster is better..........
Bigger is better..........
HT on is better...........


Hmmm... well i think HT turned OFF is actually faster on Rnhanced WUs.
IMHO that's what i'be seen but you can prove me wrong one that one.



____________

Join BOINC United now!
Auto eVB | Autoversicherung

Profile Geek@Play
Volunteer tester
Avatar
Send message
Joined: 31 Jul 01
Posts: 2460
Credit: 83,854,400
RAC: 29,806
United States
Message 302236 - Posted: 11 May 2006, 0:24:56 UTC - in response to Message 302234.

In life there are many truths.

Faster is better..........
Bigger is better..........
HT on is better...........


Hmmm... well i think HT turned OFF is actually faster on Rnhanced WUs.
IMHO that's what i'be seen but you can prove me wrong one that one.




You would certainly know better than I! If you can publish a reference work unit then I could prove it for myself. Thanks.



____________
Boinc....Boinc....Boinc....Boinc....

archae86
Send message
Joined: 31 Aug 99
Posts: 885
Credit: 1,571,766
RAC: 11
United States
Message 302255 - Posted: 11 May 2006, 0:50:32 UTC - in response to Message 302234.

[
Hmmm... well i think HT turned OFF is actually faster on Rnhanced WUs.
IMHO that's what i'be seen but you can prove me wrong one that one.
Over in Einstein, after initial skepticism, we have agreed that for some of akosf's wonderful optimized versions HT with both threads running Einstein is definitely less productive than the same host running Einstein with HT turned off for Prescott, Gallatin, and possibly other hosts.

However, running HT under trux tx36 using the line:

<priority_projects>Einstein@Home,SETI@Home</priority_projects>

in truxoft_prefs.xml to force one Einstein and one SETI job at all times when work available continues to give wonderful enhanced productivity, even with akosf S41.07 (not the special HT version) and SETI enhanced 4.12 (crunch3r version).

So if you like both projects, and don't mind a fixed 50/50 resource allocation (using the priority projects mechanism causes the preferences resource allocation to be ignored, I think) this is a highly productive move.

____________

WinterKnight
Volunteer tester
Send message
Joined: 18 May 99
Posts: 8219
Credit: 21,807,743
RAC: 11,907
United Kingdom
Message 302349 - Posted: 11 May 2006, 3:04:05 UTC

@crunch3r
But is it at least twice as fast?

@Geek@play
There is a reference unit on Marisan's site, Reference unit CPU time Comparison Which was used to test TMR's initial optimisation.

@archae86
Been running dual P3 like that by having 'connect to network' setting at 0.05 days so only one unit of each project on computer at any one time for nearly a year, and for seti it gives boost of over 10% compared to running two seti units. Haven't looked at running two Einstein since akosf's optimisation.

Andy

Message boards : Number crunching : HT on or off?

Copyright © 2014 University of California