Topic: poclbm using CPU 100% even though using GPU? (Read 64914 times)

I am via Slush's Pool.

It's slow at only 70mhash/s though.

Is nvidia mining bitcoins?
Have you able to mine & got any coins so far?

I am having the 100%+ usage issue on my system.

It's different because I am running a Intel C2D E6600 with a nVidia 460GTX, I am running Win7 64bit nVidia Drivers 314.07.  Oh and I have a nVidia 680i SLI mb running the latest MB (15 something) drivers.

When GUIMiner is running using poclbm 140% of my CPU is used (1.5 cores used) even though I set it to not do CPU mining.  Even when I turn on CPU mining nothing changes.

Anybody have any clues or ideas on this?

Nope its present on every windows version no matter which, but you might wanna test win2000 . Anyway its a opencl bug as far as i know and only happens normally on multi gpu setups.
The reason why on some machines they have reported similar situations must be some other bug, since on one i got it fixed by setting the screen to 1 screen only, that machine has 2 monitors installed on one videocard.

Now that answer is not entire correct i guess, since in the boinc community we used much older versions like 10.11, 10.12 and when you install those opencl do not work, you have to install sdk 2.1 to get stream and opencl working.
So i guess that has been passed on to all following versions even though i think from 11.2 the opencl driver should be working with the standard install.
These old version do not have the cpu bug at all, but i found cgminer not able to run with this driver.
Installing sdk 2.5 did not solve the problem, so i had to install one of the bugged ones to get the card running with cgminer again.
I have not tried any of the other miners because for me the cgminer is the best ever made.
Especially since phoenix allways seem to have aproblem connecting to the pools on my machines and all others are much slower on my cards.
And most important cgminer has so darn many nice options which can be set , i simply love it.
Till today non of the opencl group have tried to solve this opencl problem as far as i know.
And yes JackRabitt the fastest is still 2.1 in the boinc community but ofcourse program makers do incorporate new things from the newer sdk's so you end up with not good working programs. But i can promise you that sometimes you see fake results as well.
I had installed 11.10rev3 and i suddenly had 104 Mh/s on a 4770 which in fact does around 65 Mh/s so it simply was showing bugged numbers
To answer on other people mention sdk 2.2, 2.3 and 2.4 as being good, well lol i have bad experience with them on windows and no i do not have a clue about linux i hardly use it anymore

WELLLL if you'd still wanna know, Some """"""sdk's""""" give better hashrates than others

Because older catalysts doesn't have OpenCL drivers included in the installer you download from AMD. You have to download an SDK to have OpenCL support.

Were installing different versions of the ATi STREAM sdk technology, We grab the sdk, because it has Everything were ever going to need, And the simplist way to know What version of ATi Stream tech. Is by picking one of it's SDK's

Noob.

There is some hope that AMD has resolved the issue (at least somewhat) with the new drivers

https://bitcointalksearch.org/topic/newer-variant-of-catalyst-8892119-outmight-fix-100-cpu-bug-43604

Interesting. I'll try fixing the problem with that in mind later. Being a bit of a necro here - so has there been any progress on this while I've neglected this thread?

I noticed I do not get any CPU usage running poclbm when on a 512mb ram PC running a Win7 64bit

https://bitcointalksearch.org/topic/m.445411

Maybe it has to do with how vista/seven manage the cards error.

On XP you got a blue screen, on seven you get a reset/notification.
These GPU errors must be caught by the OS/CPU somehow.

Your thoughts ?

I have got alot less problems after setting cpu affinity for one core and also setting priority to low. One day and no freezes now, still stuttery though I have to be slow and gentle with opening windows.

ive read of it happening with other's though my experience is just with 7, but i have xp which i should test.

So this is a Win7 bug only?

i have started a thread at amd dev forum - opencl section about the 100% cpu usage bug with >1 gpu installed. feel free to jump over there and post your support for this issue being addressed...

http://forums.amd.com/devforum/messageview.cfm?catid=390&threadid=153211&enterthread=y

You got XP!,,, ohhh let me try.

Windows XP 64-bit / 11.6 and 2.5 / -f 10

Motherboard is a Gigabyte 890GPA-UD3H and I use the IGP as the primary display so I can game or watch videos without problems. Tried -f0 with both cards but the IGP seems to be affected, mouse lags and jumps sometimes when moving the pointer across the screen.

I haven't encountered this 100% cpu utilization problem you guys are talking about even with 11.2 and 11.4 and previous versions of poclbm.

Not a bad idea. If we all threw a quarter/half BTC in that could probably amount to a nice sum.