INTEL RAPL POWER CAPPING DRIVER DOWNLOAD
Added to drivers build bitops: I can conform your observation with compute-bound applications. At least some processors will support frequencies below the “maximum efficiency” frequency, but I don’t know if the Power Control Unit will use these or switch to duty cycle modulation Section Soon it is very likely that other vendors are also adding or considering such implementation. Fri, 4 Oct
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Power capping must have done differently among these two kinds of applications.
RAPL power capping: how does it work
Where can i find official information? Intel is slowly adding many poser under RAPL control. Setting DVFS to 1. With a high power cap, the performance is reasonable. Fri, 4 Oct One possible interpretation is that the MSRs show software-controlled duty-cycle modulation, but may not show hardware-initiated duty-cycle modulation.
RAPL power capping: how does it work
Hello, i’m looking at performance variations of my application under a range of power caps. Article Overview With the evolution of technologies, which enables power monitoring and limiting, more and more devices are able to constrain their power consumption under certain limits. While staying below a power limit, it allows devices to automatically adjust performance to meet demands – Dynamic control and re-budgeting: I read through the two sections in the manual, still I’m not very clear what is the difference between duty cycle modulation and clock cycle modulation?
I often inte it difficult to figure out which parts of Chapter 14 of Volume 3 of the Intel Architectures SW Developer’s Manual actually apply to my systems.
In one instance, I noticed that when running a power-limited application on a Xeon Platinum system, the uncore frequency was reduced by a much larger percentage than the core frequency. If the power limitation is low, it manipulates clock duty cycles. Log in to post comments.
Skip to main content. For more complete information about compiler optimizations, see our Optimization Notice. With a low power cap, the perfromance is very bad. Setting power cap directly to 75 watts no DVFS and turbo boost is onthe frequency is 1.
Depending on your processor, another place to look for DVFS is in the “uncore” clock. If each device can be constrained to some power, extra power can redistributed to other devices, which needs additional performance. Leave a Comment Please sign in to add a comment.
Each device can report its power consumption. If the power limit is still exceeded at the “maximum efficiency” frequency typically 1.
Setting power limits on the devices allows users to guard against platform reaching max system power level. Changes in retired instruction rate may indicate hardware clock cycle modulation. Power Capping framework is an effort to have a uniform interface available to Linux drivers, which will enable – A uniform sysfs interface for all devices which can offer power capping – A common API for drivers, which will avoid code duplication and easy implementation of client drivers.
Power Capping Framework and RAPL Driver 
Soon it is very likely that other vendors are also adding or considering such implementation. There are several use cases for such technologies: I seem to recall one case with severe thermal throttling that was running very slowly as if duty cycle modulation was being employedbut I never cappijg any changes to the corresponding MSRs.
I can conform your observation with compute-bound applications. Someone told me, if the power cap is ra;l, it does DVFS.
At least some processors will support frequencies below the “maximum efficiency” frequency, but I don’t know if the Power Control Unit will use these or switch to duty cycle modulation Section Add class driver PowerCap: I checked duty cycling and clock modulation.