OpenCL issue on Gentoo w/o dedicated graphics
Konrad Schumacher
Happy new year everyone,
I recently started working with MMCLAB to simulate the sensitivity of NIRS probes using MRI-based head models. Unfortunately, I cannot get the current version of MMCLAB (1.9 Moon Cake - beta) running.
I adapted the basic-example, which runs with the 2019.4 version of MMCLAB (ran into another issue, separate posting, tbd); it prints the configuration on the Matlab command line and then nothing happens; 0% CPU. By peppering the source code with printf-commands, I think i traced back the problem to the clGetPlatformIDs call in mcx_list_cl_gpu; so I suppose it's an issue with openCL, right?
I'm running Gentoo 2.6, Kernel 4.19.80, on an Intel i7-4770, no dedicated graphics card (Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller). The OpenCL runtimes seem to be installed; locate libOpenCL.so finds /usr/lib64/OpenCL/vendors/nvidia/libOpenCL.so.1.0.0 (and associated sym-links).
I have no root privileges.
Any suggestions how to resolve this, (or requests I could address to my sysadmin) would be very appreciated.
Kind regards,
Konrad
Qianqian Fang
Happy new year everyone,
I recently started working with MMCLAB to simulate the sensitivity of NIRS probes using MRI-based head models. Unfortunately, I cannot get the current version of MMCLAB (1.9 Moon Cake - beta) running.
I adapted the basic-example, which runs with the 2019.4 version of MMCLAB (ran into another issue, separate posting, tbd); it prints the configuration on the Matlab command line and then nothing happens; 0% CPU. By peppering the source code with printf-commands, I think i traced back the problem to the clGetPlatformIDs call in mcx_list_cl_gpu; so I suppose it's an issue with openCL, right?
I'm running Gentoo 2.6, Kernel 4.19.80, on an Intel i7-4770, no dedicated graphics card (Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller). The OpenCL runtimes seem to be installed; locate libOpenCL.so finds /usr/lib64/OpenCL/vendors/nvidia/libOpenCL.so.1.0.0 (and associated sym-links).
i7-4xxx is too old for opencl. we noticed that it may run opencl
in our past workshops, but the results may be incorrect, see some
of our workshop prep instructions
http://mcx.space/wiki/index.cgi?Workshop/MCX19Preparation
libOpenCL.so does not actually do anything, but traverse the ICD
(Installable Client Driver) from installed opencl compatible
device drivers and link your chosen device to the corresponding
device runtime libraries, so having a libOpenCL.so in your system
does not mean you have a valid device installed or runtime
installed.
Intel's CPU opencl runtime can be downloaded from here, I believe
it does not support i7-4xxx
https://software.intel.com/content/www/us/en/develop/articles/opencl-drivers.html
on the other hand, since you don't have a GPU, running on the CPU
using OpenCL is not necessarily faster, so you just set
cfg.gpuid=-1 to use the SSE4 based CPU code, see README
https://github.com/fangq/mmc/blob/master/README.md#whats-new
I have no root privileges.
OpenCL does not need root privilege if installed properly
Any suggestions how to resolve this, (or requests I could address to my sysadmin) would be very appreciated.
Kind regards,
Konrad
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Konrad Schumacher
on the other hand, since you don't have a GPU, running on the CPU using OpenCL is not necessarily faster, so you just set cfg.gpuid=-1 to use the SSE4 based CPU code, see README
https://github.com/fangq/mmc/blob/master/README.md#whats-new
Dear Qianqian Fang,
thanks a lot for your immediate and helpful response! I’m one step further; with gpuid = -1 the simulation starts running. However, Matlab crashes immediately. I’ll post details in a new thread as this is not related to openCL, I think.
Thanks again!
Best, Konrad