HT on or off?

Message boards : Number crunching : HT on or off?

Author	Message
Mahbubur Send message Joined: 6 Apr 06 Posts: 10 Credit: 6,760 RAC: 0	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? ____________
	ID: 302216 ·

Geek@Play Volunteer tester Send message Joined: 31 Jul 01 Posts: 2414 Credit: 79,016,596 RAC: 0	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....
	ID: 302220 ·

Mahbubur Send message Joined: 6 Apr 06 Posts: 10 Credit: 6,760 RAC: 0	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 ____________
	ID: 302221 ·

Changeling Send message Joined: 24 May 99 Posts: 20 Credit: 11,228,223 RAC: 21,778	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. :-)
	ID: 302223 ·

Crunch3r Volunteer tester Send message Joined: 15 Apr 99 Posts: 1540 Credit: 3,302,157 RAC: 0	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
	ID: 302234 ·

Geek@Play Volunteer tester Send message Joined: 31 Jul 01 Posts: 2414 Credit: 79,016,596 RAC: 0	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....
	ID: 302236 ·

archae86 Send message Joined: 31 Aug 99 Posts: 871 Credit: 1,565,978 RAC: 64	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. ____________
	ID: 302255 ·

WinterKnight Volunteer tester Send message Joined: 18 May 99 Posts: 6797 Credit: 17,045,897 RAC: 29,264	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
	ID: 302349 ·

Message boards : Number crunching : HT on or off?