mfaktc: a CUDA program for Mersenne prefactoring

Originally Posted by kriesel

Are you sure Windows isn't updating the driver again, perhaps from some local stored content? ("System restore" etc)

https://answers.microsoft.com/en-us/...2-20cd32f4b1e9

search disabling windows driver updates for other articles that may help

Why not disable Windows altogether and switch to Linux ?

[TheJudger]

Originally Posted by nofaith628

Tried:
- Clean install of both Display Driver and CUDA
- CUDA 8.0 GA1
- CUDA 8.0 GA2

Still displaying CUDA driver version 9.20. Unable to match CUDA driver version with 8.0 despite efforts to reinstall driver.

Won't work with that CUDA version! Your GPU is Volta architecture and thus CUDA 9.0 or newer is needed in general. Due to some bugs in the CUDA compiler you'll need CUDA 9.2.88 or newer for mfaktc + Volta. Maybe some is able to build CUDA 9.2 binaries including CC 7.0.

Oliver

[nofaith628]

Originally Posted by TheJudger

Won't work with that CUDA version! Your GPU is Volta architecture and thus CUDA 9.0 or newer is needed in general. Due to some bugs in the CUDA compiler you'll need CUDA 9.2.88 or newer for mfaktc + Volta. Maybe some is able to build CUDA 9.2 binaries including CC 7.0.

Oliver

Thanks for the answer! Is there any method as of now to get mfaktc 0.21 to run with a GPU that is of the Volta Architecture?

[kladner]

I think Oliver, TheJudger, (the author of mfaktc) told you what was needed. Is mfaktc not running under those conditions?

[nofaith628]

Originally Posted by kladner

I think Oliver, TheJudger, (the author of mfaktc) told you what was needed. Is mfaktc not running under those conditions?

Originally Posted by TheJudger

Won't work with that CUDA version! Your GPU is Volta architecture and thus CUDA 9.0 or newer is needed in general. Due to some bugs in the CUDA compiler you'll need CUDA 9.2.88 or newer for mfaktc + Volta. Maybe some is able to build CUDA 9.2 binaries including CC 7.0.

On an another attempt, I have installed CUDA 10 from the Nvidia website. Supposedly CUDA 10 is a newer version of CUDA 9.2.88. I am not particularly tech savvy with the software side of things, may I ask what this sentence means?

Maybe some is able to build CUDA 9.2 binaries including CC 7.0.

The error persists, and this is the output from mfaktc:

mfaktc v0.21 (64bit built)

Compiletime options
  THREADS_PER_BLOCK         256
  SIEVE_SIZE_LIMIT          32kiB
  SIEVE_SIZE                193154bits
  SIEVE_SPLIT               250
  MORE_CLASSES              enabled

Runtime options
  SievePrimes               25000
  SievePrimesAdjust         1
  SievePrimesMin            5000
  SievePrimesMax            100000
  NumStreams                3
  CPUStreams                3
  GridSize                  3
  GPU Sieving               enabled
  GPUSievePrimes            82486
  GPUSieveSize              64Mi bits
  GPUSieveProcessSize       16Ki bits
  Checkpoints               enabled
  CheckpointDelay           30s
  WorkFileAddDelay          600s
  Stages                    enabled
  StopAfterFactor           bitlevel
  PrintMode                 full
  V5UserID                  (none)
  ComputerID                (none)
  AllowSleep                no
  TimeStampInResults        no

CUDA version info
  binary compiled for CUDA  8.0
  CUDA runtime version      8.0
  CUDA driver version       10.0

CUDA device info
  name                      TITAN V
  compute capability        7.0
  max threads per block     1024
  max shared memory per MP  98304 byte
  number of multiprocessors 80
  clock rate (CUDA cores)   1455MHz
  memory clock rate:        850MHz
  memory bus width:         3072 bit

Automatic parameters
  threads per grid          655360
  GPUSievePrimes (adjusted) 82486
  GPUsieve minimum exponent 1055144

running a simple selftest...
ERROR: cudaGetLastError() returned 8: invalid device function

Still no luck.

[ET_]

Originally Posted by nofaith628

On an another attempt, I have installed CUDA 10 from the Nvidia website. Supposedly CUDA 10 is a newer version of CUDA 9.2.88. I am not particularly tech savvy with the software side of things, may I ask what this sentence means?


The error persists, and this is the output from mfaktc:

mfaktc v0.21 (64bit built)

Compiletime options
  THREADS_PER_BLOCK         256
  SIEVE_SIZE_LIMIT          32kiB
  SIEVE_SIZE                193154bits
  SIEVE_SPLIT               250
  MORE_CLASSES              enabled

Runtime options
  SievePrimes               25000
  SievePrimesAdjust         1
  SievePrimesMin            5000
  SievePrimesMax            100000
  NumStreams                3
  CPUStreams                3
  GridSize                  3
  GPU Sieving               enabled
  GPUSievePrimes            82486
  GPUSieveSize              64Mi bits
  GPUSieveProcessSize       16Ki bits
  Checkpoints               enabled
  CheckpointDelay           30s
  WorkFileAddDelay          600s
  Stages                    enabled
  StopAfterFactor           bitlevel
  PrintMode                 full
  V5UserID                  (none)
  ComputerID                (none)
  AllowSleep                no
  TimeStampInResults        no

CUDA version info
  binary compiled for CUDA  8.0
  CUDA runtime version      8.0
  CUDA driver version       10.0

CUDA device info
  name                      TITAN V
  compute capability        7.0
  max threads per block     1024
  max shared memory per MP  98304 byte
  number of multiprocessors 80
  clock rate (CUDA cores)   1455MHz
  memory clock rate:        850MHz
  memory bus width:         3072 bit

Automatic parameters
  threads per grid          655360
  GPUSievePrimes (adjusted) 82486
  GPUsieve minimum exponent 1055144

running a simple selftest...
ERROR: cudaGetLastError() returned 8: invalid device function

Still no luck.

It looks like you either installed the drivers of CUDA 10, but not the sdk, or your old installation was not overwritten, and the environment variables still pick on the older sdk...

[nofaith628]

Originally Posted by ET_

It looks like you either installed the drivers of CUDA 10, but not the sdk, or your old installation was not overwritten, and the environment variables still pick on the older sdk...

Thanks for the heads up. CUDA 10 has been installed from https://developer.nvidia.com/cuda-downloads, all previous versions of CUDA were removed and residual files were taken care of using Revo Uninstaller.

To no avail, mfaktc still outputs the following error:

ERROR: cudaGetLastError() returned 8: invalid device function

Is there perhaps an installation that I am missing? If so, can you please point me in the correct direction.

[storm5510]

Originally Posted by nofaith628

Thanks for the heads up. CUDA 10 has been installed from https://developer.nvidia.com/cuda-downloads, all previous versions of CUDA were removed and residual files were taken care of using Revo Uninstaller.

To no avail, mfaktc still outputs the following error:

ERROR: cudaGetLastError() returned 8: invalid device function

Is there perhaps an installation that I am missing? If so, can you please point me in the correct direction.

If you use the Event Viewer and look in Windows Logs > Applications, there might be something there more revealing.

[firejuggler]

Hey...
it seems that the new 20xx Nvidia series has new instructions...
|quote]
- the 32-bit integer multiply was a multiple instruction (about 3 simple inst.) and now it is a single instruction.
[/quote]
Would that help mfaktc?

[Prime95]

Originally Posted by firejuggler

Would that help mfaktc?

Greatly

[TheJudger]

Originally Posted by firejuggler

Would that help mfaktc?

Hint: check performance data of Volta.

Oliver