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 Benchmarking Platform
Phoromatic Test Orchestration

GCC 4.6 Compiler Performance With AVX On Sandy Bridge

Michael Larabel

Published on 7 February 2011
Written by Michael Larabel
Page 6 of 6 - 16 Comments

Like the HMMer results, with GraphicsMagick, any Intel Core 2 / Core i7 architecture/tuning optimizations really hurt the performance of this graphics / image processing application derived from ImageMagick.

The GraphicsMagick performance drop with the flags was not limited to a sub-set of the results, but all of the GraphicsMagick tests. With the image resizing operation, we also see that the tested GCC 4.6 snapshot has regressed rather negatively compared to GCC 4.5.2, which ran the best of any compiler tested.

With Gcrypt, the flags once again hurt the performance compared to the vanilla builds.

For those that have been asking about support for the Advanced Vector Extensions and its performance under Linux, these are the current findings, which are similar to the results from other test profiles we also tested. In some workloads, we have found when tapping the AVX capabilities of the Sandy Bridge processor the performance has improved a lot, including when using GCC's AVX floating-point math library, but in some, this actually led to a performance regression.

While the AVX instruction set has been known for years, it was just last month that the support began appearing in Intel's CPUs via the Sandy Bridge family and it will not be until later in the year that we find support for this ISA on the AMD side. Surely, in the coming months once AVX-supportive processors are more widespread, we will find more software being optimized under Linux to take advantage of the Advanced Vector Extensions support at the application level. For now though at least the Linux kernel and GCC compiler support for AVX is ready for the early-adopters. More tests shall come a few months down the road.

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 Articles & Reviews
  1. GeForce GTX 750 Series: Nouveau vs. NVIDIA Linux Driver Performance
  2. GLAMOR + RadeonSI 2D Acceleration Is Quite Good For Open-Source AMD 2D Performance
  3. AMD Radeon R9 290 OpenGL On Ubuntu 15.04: Catalyst vs. RadeonSI Gallium3D
  4. Ubuntu 15.04 Offers Faster OpenGL For AMD Radeon GPUs On Open-Source
  5. Ubuntu 15.04 Brings Some Graphics Performance Improvements For Intel Haswell
  6. Sub-$20 802.11n USB WiFi Adapter That's Linux Friendly
Latest Linux News
  1. Steam Linux Usage Drops Below 1%
  2. Many OpenGL ES 3.1 Commits Land In Mesa
  3. HHVM 3.7 Brings More Performance Improvements
  4. Experimental DragonFlyBSD Code Adds Broadwell Graphics
  5. Virt-Manager 1.2.0 Brings OVMF/AAVMF Support For UEFI In VMs
  6. Interesting GSoC 2015 Projects: Wine D3DRM, GameStream, NaCL Fun
  7. An Ubuntu Phone Will Ship This Year With The Converged Unity Experience
  8. Ubuntu 15.10 Is Codenamed The Wily Werewolf
  9. Mono 4 Is Planned For Fedora 23
  10. The Six X.Org Summer GSoC Projects For 2015
Most Viewed News This Week
  1. Trying Out Microsoft Visual Studio Code On Linux
  2. Microsoft Releases New Code IDE For Linux!
  3. Improvements On The Way For GNOME's Nautilus File Manager
  4. Kodi 15.0 Beta 1 Released
  5. A Lot Of Improvements Are Coming For Mir 0.13, Including Work Towards Libinput
  6. Mono 4.0 Makes Use Of Microsoft's Open-Source Code, C# 6.0
  7. Wayland 1.8 Alpha Release Delayed
  8. Lucid Sleep Support Is Being Worked On For The Upstream Linux Kernel