Hello !

As discussed here : http://asteroidsathome.net/boinc/forum_thread.php?id=200&postid=2758#2758

I made some tests today, and here are the results + questions.

CPU tests

Crunchbox = ASUS Z87 Pro / i7 4770K @ 3.9 Ghz / AIO WC Nepton 140XL / etc

i7 4770K @ 3.9 Ghz - HT OFF - 3 AVX WU's at the same time = Aver. 3677 secs / WU = 11040 PPD / CORE
i7 4770K @ 3.9 Ghz - HT ON*** - 7 AVX WU's at the same time : Aver. 5460 secs / WU = 7680 PPD / CORE
i7 4470K @ 3.9 Ghz - HT ON - 7 SSE3 WU's at the same time = Aver. 8100 secs / WU = 5120 PPD / CORE

*** A powerfull Aircooling or Watercooling is MANDATORY to run AVX WU's with HT ON !

=> One can see the benefits of each type of WU's

Thank you for the various applications you offer. It would be nice to have an option in the account preferences rather to be obliged to use an app_info.xml file. (Not user friendly for beginners)


GPU tests

GTX660Ti CUDA 55 : 3767 secs / WU = 11040 PPD = same as 1 CORE CPU AVX HT OFF

GTX770 : 3450 secs / WU = 12000 PPD = little better than 1 CORE CPU AVX HT OFF

=> How comes the GPU tasks are so slow, given the fact that :

All WU's = 1200020 GFLOPS
A much more significant improvement was observed on other projects that propose
to crunch on GPU or CPU the same type of WU's
ie : PPS Sieve & GFN Short : GPU WU's > 15 times faster than CPU.

As I am not a specialist, and with all due respect, I just want to understand why the same kind of speed cannot be reached with Asteroids.

Finally, once running a GPU task, the crunchbox slows down + ALL (CPU+GPU) WU's disappear when closing BM.

Thank You

Kind Regards,

Phil1966