INTEL RAPL POWER CAPPING DRIVER DOWNLOAD
Added to drivers build bitops: I seem to recall one case with severe thermal throttling that was running very slowly as if duty cycle modulation was being employed , but I never saw any changes to the corresponding MSRs. With a high power cap, the performance is reasonable. I often find 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. Add class driver PowerCap: 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.
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RAPL power capping: how does it work
With a high power cap, the performance is reasonable. I checked duty cycling and clock modulation. 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. Setting power cap directly to 75 watts no DVFS and turbo boost is onthe frequency is 1. Added to drivers build bitops: Power capping must have done differently among these two kinds of applications. Someone told me, if the power cap is high, it does DVFS.
RAPL power capping: how does it work
If each device can be constrained to some power, extra power can redistributed to other devices, which needs additional performance. While staying below a power limit, it allows devices to automatically adjust performance to meet demands – Dynamic control and re-budgeting: If the powwr limit is still exceeded at the “maximum efficiency” frequency typically 1.
Article Overview With the evolution of technologies, which enables power monitoring and limiting, intep and more devices are able to constrain their power consumption under certain limits. Add class driver PowerCap: Setting power limits on the devices allows users to guard against platform reaching max system power level.
Soon it rxpl very likely that other vendors are also adding or considering such implementation. Intel is slowly adding many devices under RAPL control.
Log in to post comments. 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 Depending on your processor, another place to look for DVFS is in the “uncore” clock. It is easy enough to monitor the actual unhalted processor cycles to determine the average frequency.
Power Capping Framework and RAPL Driver 
For more complete information about compiler optimizations, see our Optimization Notice. Where can i find official information? If the power limitation is low, it manipulates clock duty inteel.
Changes in retired instruction rate may indicate hardware clock cycle modulation. Leave a Comment Please sign in to add a comment. Each device can report its power consumption.
Also there are other technologies available, for power capping various devices. I read through the two sections acpping the manual, still I’m not very clear what is the difference between duty cycle modulation and clock cycle modulation? If power cap is set to 45 watts no DVFS and turbo boost is onthe observed frequency is more or less 1.
Power Capping Framework and RAPL Driver
My questions is how RAPL caps the power. There are several use cases for such technologies: Fri, 4 Oct 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 – Poder common API for drivers, which will avoid code duplication and easy implementation of client drivers.
One possible interpretation is that the MSRs show software-controlled duty-cycle modulation, but may not show hardware-initiated duty-cycle modulation. Skip to main content.