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doe300 / VC4CL

OpenCL implementation running on the VideoCore IV GPU of the Raspberry Pi models
MIT License
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"clinfo" can't open /dev/mem but "sudo clinfo" does not work #44

Closed geoboom closed 6 years ago

geoboom commented 6 years ago

I have successfully compiled and installed VC4C, VC4CL and confirmed that both are working; when I do clinfo I get OpenCL information on my GPU and

[VC4CL] can't open /dev/mem
[VC4CL] This program should be run as root. Try prefixing command with: sudo
terminate called after throwing an instance of 'std::system_error'
what(): Failed to open /dev/mem: Operation not permitted
aborted

which is expected as running any VC4CL implementation requires root access. However, when I do "sudo clinfo", I get Number of platforms 0 as output.

Prior to the above, I created file /etc/OpenCL/vendors/VC4CL.icd which contains one line: /usr/local/lib/libVC4CL.so (I also tried libVC4CL.so as the one line but to no avail) as per instructions.

Please help me, thanks.

geoboom commented 6 years ago

I don't think this issue is only pertinent to clinfo. When I try to run other programs that utilize OpenCL I get permission errors when not running as root (expected) but when I run as root, OpenCL is not detected.

doe300 commented 6 years ago

Maybe you also need to define the LD_LIBRARY_PATH, like in https://github.com/doe300/VC4C/issues/114 ? You may also take a lopk at https://github.com/doe300/VC4CL/issues/16#issuecomment-355947972

geoboom commented 6 years ago

Indeed. I added LD_LIBRARY_PATH=/usr/local/lib to /etc/environment and now it works for root user. Thanks!