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-   -   Multi-PI for multi-cores? (http://www.hardwarecanucks.com/forum/overclocking-tweaking-benchmarking/1003-multi-pi-multi-cores.html)

francois methot April 23, 2007 04:46 PM

Multi-PI for multi-cores?
 
Is sombody knows where to download a multi-PI program that work for multi-cores system ?

sswilson April 23, 2007 04:59 PM

On XP at least Super-Pi worked both cores on my new chip.

francois methot April 23, 2007 05:03 PM

...I was asking because somebody told me today that SuperPI is old and single CPU driven!

sswilson April 23, 2007 05:10 PM

I don't believe it is specifically optimized for two cores, but the workload is dropped across both.

The #s we see posted for super-pi (that intel now kicks serious butt with) are for the normal super-pi. (at least as far as I can tell).

b1lk1 April 23, 2007 05:10 PM

You need to run multiple instances of it under XP and set the affinity to each core for each instance to get it to work. I am not sure what program you used Swilson, but I have yet to see a PI program that is multi-cored natively.

sswilson April 23, 2007 05:16 PM

When I run mod 1.4 both cores show about 50% usage.

francois methot April 23, 2007 05:26 PM

Quote:

Originally Posted by b1lk1 (Post 6946)
You need to run multiple instances of it under XP and set the affinity to each core for each instance to get it to work. I am not sure what program you used Swilson, but I have yet to see a PI program that is multi-cored natively.

I run SuperPI with affinity set on one CPU and compare with affinity set on all 4 CPU...the result is the same!
What do you mean by multiple instances...is it to open multiples SuperPI? ...and then what?

b1lk1 April 23, 2007 07:35 PM

If you want 100% load from SuperPI, you need to open as many instances as you have cores. Then in task manager, set each instance to a specific core, 1-4. Then start 4 PI runs. If there is ANY instability in your overclock it will show up fast.

francois methot April 24, 2007 06:32 AM

I openned 4 instances of Super PI and set the affinity on each core.

No matther what I do, only one core is not in error. All others cores produces errors when they run at the same time. I tried 2, 3 and 4 instances and only one core give a good results. I can run stable for 4 hours with Orthos on all four cores???

...is Super PI a better tool for stability? One good thing will be that it can test in less than 40 seconds...(if I select 2M) compare to Orthos!

Scratch April 24, 2007 03:28 PM

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