Multi-PI for multi-cores?

[b1lk1]

Originally Posted by francois methot

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!

I would say if you can run 4 hours Orthos then your PC is somewhat stable. You really should be able to run 4 instances of PI if your PC is 100% stable. There are so many other factors, I wouldn't worry too much. But if you want to be sure of perfect stability, run Orthos for 24hrs+. That is the best proof of a truely stable system.

[pscout]

Here is a link to wPrime that runs a superpi using 1 thread for each core

wPrime Multithreaded Benchmark

A number of sites have setup threads in their benching sections with links to hwbots to setup team scores for benching.

eg here is one from OCF [hwbot] wPrime 1024m ranking - Overclockers Forums

[Scratch]

News - OCCT Website english

OCCT has quad-core support and is an excellent utility for testing stability
If your pc can handle a 30min blended burnin then it it is a good start. If it fails within that 30min there is no way it will be able to handle a gromacs core FaH client or Orthos 24

[Shredder]

Systools has a benchmarking program in it (PI)that allows single or all cores to be tested. I have used it with good results for multithread testing. Also Intel is giving out good literature on making multithreaded applications if you have those skills.

[Eldonko]

Yeah to test a dual or quad properly you need 1 PI instance per core. If you get errors there is something wrong, likely mem related if orthos is clean.

[Supergrover]

yeah everytime I errored in pi it was because of RAM settings to tight or high.

[Arcygenical]

Make sure the super pi instances are separated into different directories!

2/4 instances in the same folder will error out.

[lowfat]

For ever SuperPi window open, you need to have a different copy of SuperPi open. Meaning each copy needs to be in a completely different folder. Otherwise it will always error out. And SuperPi is single threaded. It shows 50% on each core because that is what windows does for every single threaded application.