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EPCCed / adept-rapl-lib

Adept Project RAPL Wrapper Library
Apache License 2.0
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Problems with RAPL and adept-kernel-example. #1

Open brnorris03 opened 8 years ago

brnorris03 commented 8 years ago

I am not able to get RAPL measurements with adept-rapl-lib and adept-kernel-example. I did change permissions to /dev/cpu/*/msr and ran "sudo setcap cap_sys_rawio=ep kernel", but when I execute ./kernel in adept-kernel-example, it seems to hang. This is happening on an Intel Haswell (CPU E5-2699 v3):

uname -a Linux arya 4.2.0-21-generic #25-Ubuntu SMP Wed Dec 2 18:42:25 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

nickaj commented 8 years ago

Sorry to hear you are having problems with this. We're trying to replicate this problem on our systems and should then be able to fix.

nickaj commented 8 years ago

Sadly, I'm unable to replicate this problem. I do find issues if the kernel binary is on an NFS mount, but this would cause setcap to fail. Are you able to run kernel via sudo successfully?

brnorris03 commented 8 years ago

There are no NFS mounts on this machine, so I don't think that's the problem. I did try with sudo as well. Is there a good way to try seeing where it's hanging? Run in debugger?

nickaj commented 8 years ago

You should be able to pick through it with a debugger. I would perhaps start with the sample application from the lib repository as it's simpler. If debugging is a problem, I can produce a version with copious printfs to help narrow it down.