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Old 2005-06-28, 05:50   #1
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Default Query - Running GIMPS on a 4 way system

Hi All

I currently run GIMPS as a service on a dual Xeon system and it works fine, a service runs on each CPU as if it were a single processor. I am wondering if anyone has any experience with running GIMPS on a 4 CPU Windows system - is this type of thing possible, like 4 instances of the program each assigned to an individual CPU?

Thanks!
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Old 2005-06-28, 08:19   #2
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As long as there are four physical CPUs - i.e. not hyperthreading - it should work though there will be a performance hit. You'll not get 4 time sthe amount of work per unit time but more like 2-3 times depending on the memory subsystem.
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Old 2005-06-28, 22:22   #3
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also if its duel core then be reminded that you should watch your heat.... 2 cores under the same heat spreader means you need to disipate a lot of heat. If its a 4x xeon machine show us some benchmarks
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Old 2005-06-29, 03:29   #4
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No problems - I anticipate I should have the hardware in a month or so. I will get some figures together - thank you for the responses.
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Old 2005-06-29, 21:12   #5
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You may want to set 1 or more to factoring to limit the hit on the memory requirements.
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Old 2005-07-04, 03:35   #6
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Remember that Windows XP Professional is only licensed for 1 or 2 physical cpus (or 2 physical + 2 virtual hyperthreads).

For 4 physical cpus you will either need linux or a more expensive version of microsoft OS (you probably knew that).

Also if you're buying FOUR Xeons, you may want to remember that dualcore Xeons will be launched during first half of 2006, so it may depreciate! Or that in the meantime, benchmarks appeared to show one 840EE was comparable to a dual singlecore Xeon system in performance.
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Old 2005-07-04, 04:27   #7
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I ran Prime95 on a 4 way P3 Xeon 800mhz (1mb cache) with 4gb ram (Cpq DL580/g1) for a week or so just doing factoring. The box was unuseable on the console or remotely when running. Didn't try running any LL tests, I knew I didn't have the box for long.

I would think the multiprocessor Opteron's wouldn't take as much of a hit with the larger/better FSB.
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