Dual core support?
1 Dec 2005 3:45:57 UTC
Topic 190270
(moderation:
I just replaced my old pc with an a64x2 3800 even though I have my preferences set to use multiple processors my eta for completing a work unit is indicating that i'm only running on one core.
My old athlon ran at 1400mhz, and my new one is running at 2gig, if both cores were running I should be ~3x as fast but the actual eta per work unit has only shifted from 9.5 to 6.5hrs so it appears I'm only using a single core at the moment.
Dual core support?
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You are correct, your view computer page shows one CPU, did you set the preference to use 2 or more and then update the Boinc CC.....?
BOINC Wiki
RE: I just replaced my old
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Dan,
I'd like to call your attention to a small error. However you set up Boinc on the new machine, it will not use both cores to crunch one individual Workunit. Where does that leave us? With a 2GHz core crunching a WU, compared with your previous rig's 1.4GHz proc, for something like a 42% faster crunch, possibly a tiny bit above that due to larger L2 cache. That is right in line with the times you've quoted. The potential benefit of crunching with your new double-core is that it is capable of crunching 2 WUs simultaneously, one on each core. I hope that settles your mind, helps you understand.
Michael
microcraft
"The arc of history is long, but it bends toward justice" - MLK
RE: I'd like to call your
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So how do I do this? I didn't see anything in the setup guid linked above mentioning dual core systems.
i'm not in any rush here
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i'm not in any rush here since I'm planning on doing several days of prime95 torture testing before doing anything important on my new box.
RE: So how do I do this? I
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Dan,
There, sir, I'm afraid you have me at a loss, except to repeat Jim K's suggestion - to go to your account page/view or edit general preferences, ensure that "on multiprocessors use at most... set to value "2", make sure to click "update preferences" at the bottom of the Edit General Preferences page, and then in Manager window, on the "Projects" tab, click on (select) the currently-running project, and click the "Update" button on the left.
One more thought - While you have the Manager open, check the "Work" tab. Does it show 1 item status "Running", or 2 of them running? If it shows 2 items as "Running", disregard the paragraph above, because that would indicate that both cores are actively on the job.
Michael
microcraft
"The arc of history is long, but it bends toward justice" - MLK
Hi Dan, It sounds like
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Hi Dan,
It sounds like Windows 2000 is not set up to run two processors. When you open task manager and click on the performance tab does it show two graphs (indicating two processors)? If not, you need to change your setup. For more information on how to do that, go to this page.
TTYL
Richard
THanks that worked. Now I
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THanks that worked. Now I just need to do a week or three of torture testing with prime95 to see how fast I can run it. (I'm not going to run real data until I'm sure my clocking values are stable)
RE: THanks that worked.
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I personally think that running E@H on both cores is an excellent torture test for your new box (:-).
[If lots of invalid results are returned then some other users might get annoyed that you are delaying their credits, but I'm sure you'll watch the results and stop if this is happening!]
Director, Einstein@Home
RE: RE: THanks that
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P95 has a built in torture tester though. It runs the same computations over and over again and confirms that it gets the same results every time. Feedback immediately instead of days down the line. Making a tweak and waiting to see what happens with a feedback loop that slow's impossible. Even the spontainious reboots or bsods that would occur from overstressing the hardware are much slower.
RE: P95 has a built in
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OK, fair enough!
Director, Einstein@Home