Message boards :
Number crunching :
Why is SSE3 or PNI and SSE2 used for the same work units?
Message board moderation
| Author | Message |
|---|---|
 Send message Joined: 4 Aug 08 Posts: 14 Credit: 278,575 RAC: 0 |
Looking at some results, also on BOINC (7.0.28), I see SSE2 and SSE3(PNI*) Used for the same work? *Presscot New Instruction Set. Tasks are done by an I7-2600, with a very small OC and an C2Extreme X9650, running at 3.6 GHz. (20% OC) The 2 hosts. I don't see any difference in completion time, so I assume there is another reason? Maybe 'older hosts' are doing better/faster with SSE2 and later hosts SSE3? And are quite old if only SSE2 can be used. Or AMD CPUs, older types doesn't have SSE3 or PNI Or just testing which is better overall? SSSE3x and SSE4.1/4.2 usually is faster then SSE3/PNI.  Knight Who Says Ni N! |
|
Send message Joined: 27 Sep 08 Posts: 811 Credit: 657,435,810 RAC: 222,937    |
I think it's just random how the different version task are assigned. I don't think there was much extra performance to be gained by having SSE4.x, there was one instruction that someone meantioned that could have some but the admins haven't had time to re-complie the apps to include it. The Admins certinally wanted wide computer support so we have the spread of SSE versions to support that. |
©2024 CERN