fail to mine with beignet OpenCL driver

[individual-it]

fail to mine with beignet OpenCL driver

[ddobreff]

I don't think you can do more than a few Sols with Intel's OpenCL...

[individual-it]

would be still nice to try, even just to know beignet is working

[mbevand]

I tried looking into this, installing beignet-opencl-icd on my Ubuntu 16.04 Core i5-6500 machine, but attempting a clGetDeviceIDs fails:

beignet-opencl-icd: no supported GPU found, this is probably the wrong opencl-icd package for this hardware
(If you have multiple ICDs installed and OpenCL works, you can ignore this message)
clGetDeviceIDs (-1)

So I can't debug. If you help me fix my issue, I'll help you fix yours :)

[padrino121]

Mbevand, the deb provided by Ubuntu is outdated, I needed to compile from source to get something above I think v1.0 to get over that issue

[individual-it]

I'm using the Tanglu distribution, which is mainly debian compatible. So I installed beignet 1.1.2 from jessie-backports
https://packages.debian.org/jessie-backports/beignet
But my CPU is also a different one: i5-4200U

[asbachb]

I also have problems running silentarmy with beignet 1.2.1

[asbachb@mbpro11 ~]$ silentarmy --list
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
Devices on platform "Intel Gen OCL Driver":
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
  ID 0: Intel(R) HD Graphics Haswell Ultrabook GT3 reserved
Devices on platform "Intel(R) OpenCL":
  ID 1: Intel(R) Core(TM) i5-4288U CPU @ 2.60GHz
[asbachb@mbpro11 ~]$ 

[asbachb@mbpro11 silentarmy]$ sa-solver --nonces 100 -v -v
Solving default all-zero 140-byte header
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
Found 2 OpenCL platform(s)
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
Using GPU device ID 0
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
X server found. dri2 connection failed! 
Building program
OpenCL build failed (-11). Build log follows:
input.cl:654:18: warning: initializing '__global uchar *' (aka '__global unsigned char *') with an expression of type '__global char *' converts between pointers to integer types with different sign
input.cl:787:37: warning: incompatible pointer types initializing '__global char *' with an expression of type '__global uint *' (aka '__global unsigned int *')
input.cl:787:53: warning: incompatible pointer types initializing '__global char *' with an expression of type '__global uint *' (aka '__global unsigned int *')
kernel_round0:(GBE): error: failed in Gen backend.

[birdie-github]

Beignet works perfectly here but you'll have to install the latest release of it (1.2.0).

Anyway, nheqminer_cpu_xenoncat will give you twice as many sol/s. Usual Intel's CPUs (non-Iris) have very weak OpenCL performance and I'm not sure that L4 cache in case of Iris really helps.

Also there's this bug: https://bugs.freedesktop.org/show_bug.cgi?id=98702

[Kubuxu]

@birdie-github this is to be expected, xenocat miner is hand written in x86 ASM giving best possible performance.
By running SA on CPU you are compiling OpenCL to ASM. The OpenCL driver for CPU is mostly for evaluation and testing and not for running high performance computations.