Forum > GPU crunching
Longer Load Time with New GPU Board
Purple Rabbit:
I don't have a problem, but I am curious. Santa gave me (OK, I specified what I wanted) a new GTX 260 board to replace my 8600GTS in my Q6600 Win Vista computer. The old GPU card took 20 seconds (CPU time) to initialize and then off it went. The GTX 260 takes 30 seconds (CPU time). I'm kind of assuming that there is more "stuff" to be sent to the more capable card before it does its thing. All tasks are successfully completing with the new GPU card so I'm quite happy with the 5x increase in speed.
I may have just answered my own stupid question, but inquiring minds want to know ;D I'm running what the 0.2 installer gave me for SETI (including CUDA).
Jason G:
Check you grabbed the Cuda 2.3 DLLs & dropped them over the 2.2 ones the installer would have put in. Hovering the mouse over the dll files (cudart.dll & cufft.dll) in the project folder should show a tooltip containing the version number. An improved installer with these optional DLLs included is in the process of development ( taking time because of other issues.)
As an aside, another thing you *might* be seeing with a new card, and so new drivers, *could* be a result of having innocently updated/installed your display drivers to the latest 195 series whilst installing the new card. I don't know about others, but I see a performance drop (and more importantly stability) in Win7x64 with the latest drivers, and have now reverted to 191 series. That's with a 9600GSO.
It is possible the dirvers are doing 'more stuff' ... but exactly whatever that is, it hasn't justified either the compromised system stability or performance drop for me.
Purple Rabbit:
Thanks Jason.
I loaded the CUDA 2.3 dlls eons ago for the old card after the 0.2 installer did its thing. Sorry I didn't mention it before...sigh.
I didn't load any new software for the new card. Potato, http://setiathome.berkeley.edu/show_host_detail.php?hostid=4367681 (I'm a wabbit!) seemed to still have what I needed. I assume nothing has gone South (or North for you :P ) since then. I have confirmed that I still have 191 series of drivers. Nothing seems to have changed except the new hardware
Like I said,this question is no big deal. Everything is working just fine, but why is it working this way? ;)
Rick
Jason G:
--- Quote from: Purple Rabbit on 02 Jan 2010, 05:58:28 pm ---...
Like I said,this question is no big deal. Everything is working just fine, but why is it working this way? ;)
....
--- End quote ---
Mmmm, with those in the clear I don't really know, other than perhaps the higher compute capability of the new card ( 1.3 I presume). activates some extra Cuda preparation of other library functions/kernels. So then the answer might be yes, the startup could be sending larger/better kernels to the card I guess. There is some limited compute capability 1.3 specific code in there that I never played with...
Purple Rabbit:
OK, I'll assume that the answer to my question remains a mystery of the universe, unknowable to all ;)
If I stay up at night wondering about this, it's your fault ;D
Rick
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