1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

Boosting The Performance-Per-Watt Of GPUs

Nouveau

Published on 11 October 2012 05:18 PM EDT
Written by Michael Larabel in Nouveau
1 Comment

Some prominent open-source graphics driver developers have published a paper for last week's USENIX HotPower 2012 that covered the topic of Power and Performance Analysis of GPU-Accelerated Systems.

Yuki Abe, Hiroshi Sasaki, Martin Peres, Koji Inoue, Kazuaki Murakami, and Shinpei Kato wrote the paper and did the work covering the power and performance of GPU-based systems. The two names in particular you should recognize are Martin Peres and Shinpei Kato.

Martin Peres is the one that has been working on power management and re-clocking support for the open-source Nouveau driver. He's also talked about open-source graphics security and other topics.

Shinpei Kato meanwhile has done work on PathScale's open-source NVIDIA compute driver, proposed GPU command scheduling, and most recently has been working on Gdev that is an open-source NVIDIA CUDA run-time.

Here's their abstract on the USENIX HotPower paper:
Graphics processing units (GPUs) provide significant improvements in performance and performance-per-watt as compared to traditional multicore CPUs. This energy-efficiency of GPUs has facilitated use of GPUs in many application domains. Albeit energy efficient, GPUs still consume non-trivial power independently of CPUs. It is desired to analyze the power and performance charateristic of GPUs and their causal relation with CPUs. In this paper, we provide a power and performance analysis of GPU-accelerated systems for better understandings of these implications. Our analysis discloses that system energy could be reduced by about 28% retaining a decrease in performance within 1%. Specifically, we identify that energy saving is particularly significant when (i) reducing the GPU memory clock for compute- intensive workload and (ii) reducing the GPU core clock for memory-intensive workload. We also demonstrate that voltage and frequency scaling of CPUs is trivial and even should not be applied in GPU-accelerated systems. We believe that these findings are useful to develop dynamic voltage and frequency scaling (DVFS) algorithms for GPU-accelerated systems.
And their conclusion:
We have presented a power and performance analysis of GPU-accelerated systems based on the NVIDIA Fermi architecture. Our findings include that the CPU is a weak factor for energy savings of GPU-accelerated systems unless power gating is supported by the GPU. In contrast, voltage and frequency scaling of the GPU is significant to reduce energy consumption. Our experimental results demonstrated that system energy could be reduced by about 28% retaining a decrease in performance within 1%, if the performance level of the GPU can be scaled effectively.

In future work, we plan to develop DVFS algorithms for GPU-accelerated systems, using the characteristic identified in this paper. We basically consider such an approach that controls the GPU core clock for memory-intensive workload while controls the GPU memory clock for compute-intensive workload. To this end, we integrate PTX code analysis into DVFS algorithms so that energy optimization can be provided at runtime. We also consider a further dynamic scheme that scales the performance level of the GPU during the execution of GPU code, whereas we restricted a scaling point at the boundary of GPU code in this paper.
A PDF of their GPU power/performance paper that was published last week can be found at USENIX.org.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
Latest Linux Hardware Reviews
  1. NVIDIA GeForce GTX 970 Offers Great Linux Performance
  2. CompuLab Intense-PC2: An Excellent, Fanless, Mini PC Powered By Intel's i7 Haswell
  3. From The Atom 330 To Haswell ULT: Intel Linux Performance Benchmarks
  4. AMD Radeon R9 285 Tonga Performance On Linux
Latest Linux Articles
  1. AMD Moves Forward With Unified Linux Driver Strategy, New Kernel Driver
  2. MSI: Update Your BIOS From The Linux Desktop
  3. NVIDIA vs. AMD 2D Linux Drivers: Catalyst Is Getting Quite Good At 2D
  4. 15-Way GPU Comparison With Mesa 10.3 + Linux 3.17
Latest Linux News
  1. Linux 3.19 To Have Skylake Graphics, PPGTT Enablement
  2. Ubuntu 16.04 Might Be The Distribution's Last 32-Bit Release
  3. Imagination Releases Full ISA Documentation For PowerVR Rogue GPUs
  4. Features GNOME Developers Want In The Linux Kernel
  5. GTK+ Gains Experimental Overlay Scrollbars
  6. Phoronix Test Suite 5.4 M3 Is Another Hearty Update
  7. GParted 0.20 Improves Btrfs Support
  8. EXT4 In Linux 3.18 Has Clean-ups, Bug Fixes
  9. Emacs 24.4 Has Built-In Web Browser, Improved Multi-Monitor Support
  10. NVIDIA's NVPTX Support For GCC Is Close To Being Merged
Latest Forum Discussions
  1. Users/Developers Threatening Fork Of Debian GNU/Linux
  2. HOPE: The Ease Of Python With The Speed Of C++
  3. Proof that strlcpy is un-needed
  4. Bye bye BSD, Hello Linux: A Sys Admin's Story
  5. Updated and Optimized Ubuntu Free Graphics Drivers
  6. NVIDIA Presents Its Driver Plans To Support Mir/Wayland & KMS On Linux
  7. AMD Is Restructuring Again, Losing 7% Of Employees
  8. Open-Source AMD Fusion E-350 Support Takes A Dive