mfakto: an OpenCL program for Mersenne prefactoring

[aperson1]

Originally Posted by kriesel

Sounds like you're using the IGP (low end GPU that is part of the CPU package). That will necessarily impair CPU throughput since they share the same wattage limit. They also share the same memory & bandwidth limit, but GPU TF does not use much memory. If the CPU supports hyperthreading, note that for P-1, PRP, LLDC, hyperthreading usually is not of benefit, so one thread per core will show 50% utilization in Task Manager by prime95. It should show almost no CPU usage for mfakto or other GPU apps; you want nearly all computation in a GPU app to be performed by the GPU, including sieving of candidate factors when possible. (Kernels ending in _gs)

Ack! You're entirely right on all counts, I feel silly for not realizing that, I've really got no excuse not to have considered that, but that's what stupid questions are all about!

See my above post for solving the unusually low utilization, but everything else checks out with my situation.

[28add11]

So I've been trying to get mfakto working on my ARC GPU so I can feed my growing GIMPS addiction, but it doesn't seem to be working whatsoever. That or I'm just stupid. The issue that I am running into more specifically is that, after turning mfakto on, my PC gets unbearably slow, and then after a while just shuts the display off and seemingly stops running the program, since the GPU cools down a lot. I am running an ARC A750 on the newest drivers, and have downloaded mfakto from the source in this thread a few posts back. I disabled the -O flag since it was bringing up issues during compilation. All other settings are default iirc.

Sorry if this is something that has already been answered or is a bad question, I'm new here!
Many thanks - 39

P.S. If anyone wants to try something on my GPU within reason I'm fine with it, Thanks!

[rebirther]

Originally Posted by 28add11

So I've been trying to get mfakto working on my ARC GPU so I can feed my growing GIMPS addiction, but it doesn't seem to be working whatsoever. That or I'm just stupid. The issue that I am running into more specifically is that, after turning mfakto on, my PC gets unbearably slow, and then after a while just shuts the display off and seemingly stops running the program, since the GPU cools down a lot. I am running an ARC A750 on the newest drivers, and have downloaded mfakto from the source in this thread a few posts back. I disabled the -O flag since it was bringing up issues during compilation. All other settings are default iirc.

Sorry if this is something that has already been answered or is a bad question, I'm new here!
Many thanks - 39

P.S. If anyone wants to try something on my GPU within reason I'm fine with it, Thanks!

Iam also interested in Intel ARC GPUs support, we have some users with some cards, every power is counting.

[kracker]

Originally Posted by 28add11

So I've been trying to get mfakto working on my ARC GPU so I can feed my growing GIMPS addiction, but it doesn't seem to be working whatsoever. That or I'm just stupid. The issue that I am running into more specifically is that, after turning mfakto on, my PC gets unbearably slow, and then after a while just shuts the display off and seemingly stops running the program, since the GPU cools down a lot. I am running an ARC A750 on the newest drivers, and have downloaded mfakto from the source in this thread a few posts back. I disabled the -O flag since it was bringing up issues during compilation. All other settings are default iirc.

Sorry if this is something that has already been answered or is a bad question, I'm new here!
Many thanks - 39

P.S. If anyone wants to try something on my GPU within reason I'm fine with it, Thanks!

The output of --perftest will be useful, if it even works.
Also, I'm out of the loop but I hear Intel Arc drivers are really bad at this point in time.

[28add11]

Well I ran --perftest and everything went fine, logs are attached. After that, thinking that it might've just fixed itself I ran mfakto aand it happened again. This time even with an error code!

Date    Time | class   Pct |   time     ETA | GHz-d/day    Sieve     Wait
Error -5 (Out of resources): clEnqueueReadBuffer RES failed.1206    0.00%
ERROR from tf_class.

Also I had notepad open, and it managed to turn the entire top bar black. ARC is fun.

[kracker]

Originally Posted by 28add11

Well I ran --perftest and everything went fine, logs are attached. After that, thinking that it might've just fixed itself I ran mfakto aand it happened again. This time even with an error code!

Date    Time | class   Pct |   time     ETA | GHz-d/day    Sieve     Wait
Error -5 (Out of resources): clEnqueueReadBuffer RES failed.1206    0.00%
ERROR from tf_class.

Also I had notepad open, and it managed to turn the entire top bar black. ARC is fun.

I would set GPUType to INTEL with those results, and play around with GPUSievePrimes, GPUSieveProcessSize and GPUSieveSize(lowering them most likely).

[kriesel]

Perhaps set VectorSize to match what GPU-Z advanced tab, OpenCL category, native vector sizes, indicates, for the GPU in question, first. (Example screen shot is illustrative of navigating GPU-Z only, not for an ARC GPU, as I don't have one.)

Welcome, 28add11, to the forum and the hunt. You may find some of the reference info collection useful or interesting.

[chris2be8]

How old are the PC and the GPU? If more than a few weeks old start by clearing dust etc out of the system.
Then install temperature monitoring software (or start it if already installed) and see how hot things get during a run.
Sorry I can't be more specific, I don't use Windows.

And welcome to the forum.

[28add11]

Originally Posted by kriesel

Perhaps set VectorSize to match what GPU-Z advanced tab, OpenCL category, native vector sizes, indicates, for the GPU in question, first.

Just judging by how things look in a quick test run, I think you're right! I'll test it out more and make sure everything is ok during the time when I have to go out later. We shall see!

[28add11]

After doing some longer tests, it seems kinda hit or miss. Overnight it crashed with the same error, but while I was at class it worked fine. Probably an issue on Intel's end, but that'll hopefully be fixed soon with how fast they're working on drivers. Thanks for the help!

[rebirther]

Originally Posted by kracker

I would set GPUType to INTEL with those results, and play around with GPUSievePrimes, GPUSieveProcessSize and GPUSieveSize(lowering them most likely).

Any news for ARC support? I have asked on our project forum to collect some datas.