topic Hi Roman, in Software Tuning, Performance Optimization & Platform Monitoring

RAPL & PCM

Huazhe_Z_ — Tue, 08 Apr 2014 04:47:36 GMT

Hi guys,

I have been using RAPL for a while. However, I did not figure out how to disable RAPL accessing PMU in order to use PCM. Could anyone give me some idea on that? Thanks!

do you want to use just RAPL

Roman_D_Intel — Tue, 08 Apr 2014 06:38:03 GMT

do you want to use just RAPL and no PMU in PCM?

Roman

Hi Roman,

Huazhe_Z_ — Tue, 08 Apr 2014 15:18:24 GMT

Hi Roman,

First, thank you for fast reply.

I want to use RAPL(used to control power) and PCM(used to monitor some hardware info) seperately. That is I need to turn on and off the RAPL from time to time. To disable RAPL(the power capping function), I don''t know if it is equivalent to set a high power cap that the system could never reach. I also tried the enable bit introduced in MSR, but for some reason, it doesn't seem to disable the capping.

Huazhe

Huazhe,

Roman_D_Intel — Fri, 25 Apr 2014 11:23:12 GMT

Huazhe,

Intel PCM does not use power capping/controlling functions. It only reads energy consumption information from RAPL registers (just monitors them).

Did you try Intel Power Governor to setup power capping?

Roman