LL with OpenCL

[preda]

On GPUs in particular, I think PRP is "the new LL". (I'm a big fan of PRP, as it has this simple-cheap-and-oh-powerful error checking)

[kriesel]

Originally Posted by preda

On GPUs in particular, I think PRP is "the new LL". (I'm a big fan of PRP, as it has this simple-cheap-and-oh-powerful error checking)

Agreed,. The speed advantage on OpenCl you've provided is also persuasive for me.

The power of the Gerbicz checked PRP on cpus is persuasive also, catching much more potential error than the Jacobi checked LL can.

I'd like to see PRP with Gerbicz check implemented on CUDA also, or failing that, on the NVIDIA flavor of OpenCl.

[kriesel]

Originally Posted by kriesel

What OpenCL version level support is required for clLucas to operate fully?

Looking at the source code,

int
init_device (int device_number)
{
  clLucas.set_deviceId (device_number);
}

replaced cudalucas's ~40-line routine to init, describe, and check for minimum CUDA compute capability required. So there's no hint of an answer to the above question in the cllucas.cpp source code.

[mnd9]

Originally Posted by kriesel

Looking at the source code,

int
init_device (int device_number)
{
  clLucas.set_deviceId (device_number);
}

replaced cudalucas's ~40-line routine to init, describe, and check for minimum CUDA compute capability required. So there's no hint of an answer to the above question in the cllucas.cpp source code.

I just tried to run clLucas 1.04 on an ATI HD 4650 (which I believe only supports OpenCL 1.0) and am getting an error message that cl_amd_fp64 is not supported on this device. I think this may relate to DP not being supported on this device.

[kriesel]

Originally Posted by mnd9

I just tried to run clLucas 1.04 on an ATI HD 4650 (which I believe only supports OpenCL 1.0) and am getting an error message that cl_amd_fp64 is not supported on this device. I think this may relate to DP not being supported on this device.

Something else you could try is one of the very early versions of GpuOwl; up to v0.6 was LL. Links to source code and Windows binaries at
https://www.mersenneforum.org/showpo...39&postcount=4
But that would likely also require DP.