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

GCC 4.6 Compiler Performance With AVX On Sandy Bridge

Michael Larabel

Published on 7 February 2011
Written by Michael Larabel
Page 2 of 6 - 16 Comments

When starting out with the PostgreSQL test, the results were quite shaky. GCC 4.4.5 was faster than GCC 4.3.5, but the database performance regressed when built by GCC 4.5.2 and dropped even further with GCC 4.6.0. When using the corei2 march/mtune flags for building the compiler and open-source Linux benchmarks via the Phoronix Test Suite, there was a definitive improvement over GCC 4.6.0 without the flags. However, when switching from the core2 to corei7 tuning, the performance actually dropped. When enabling the corei7-avx support, as should be for this Sandy Bridge CPU, the number of PostgreSQL transactions per second peaked for being on GCC 4.6 but still was not as fast as found in GCC 4.4.5 or GCC 4.5.2 Enabling the AVX floating-point math library support was of no benefit.

When running the Apache web-server, using the core2/corei7-avx options were of no benefit but actually led to a drop in the number of requests per second being handled. Enabling the AVX floating-point math support did improve the performance, but it still was behind that of a vanilla GCC 4.6.0 build or the numbers from GCC 4.3/4.4/4.5.

When using the respective GCC release to build the Apache web server, however, using the mtune and march optimizations led to a great decrease in the time required to build the open-source software. There was not, however, any build speed-up attributed to using the corei7/corei7-avx options for Apache but using just the core2 flag had squeezed as much as it could out of the system.

Latest Linux Hardware Reviews
  1. Scythe Mugen MAX
  2. Intel Core i7 5960X Haswell-E On Linux
  3. Intel 80GB 530 Series M.2 SSD On Linux
  4. With A New Motherboard, The Core i7 5960X Haswell-E Lights Up
Latest Linux Articles
  1. A Tour Of The New Phoronix Office
  2. 7-Way Linux Desktop Gaming Comparison On Ubuntu 14.10
  3. Intel P-State vs. CPUFreq Benchmarks On The i7-5960X
  4. RadeonSI GLAMOR Benchmarks With X.Org Server 1.16
Latest Linux News
  1. Linux 3.17-rc6 Released; Linux 3.17 Final Might Come In One Week
  2. X.Org Server 1.16.1 Released
  3. Mesa Gets Closer To Having OpenGL 4.0 Tessellation Support
  4. Uselessd: A Stripped Down Version Of Systemd
  5. F2FS Tools Gain FSCK Support
  6. FreeBSD 10.1 Has The New VT Driver, Hardware Improvements
  7. AntiMicro 2.6 Yields Greater Compatibility For Gamepads On Linux
  8. OpenGL 3.3 / GLSL 3.30 Lands For Intel Sandy Bridge On Mesa
  9. AMD's RadeonSI Gallium3D Driver Sees Some Improvements
  10. Mesa 10.3 Released With The Latest Open-Source GPU Driver Improvements
Latest Forum Discussions
  1. X.Org Women Outreach Program Only Turns Up Two Applicants So Far
  2. Wasteland 2 Officially Launched Today, Including For Linux Gamers
  3. NVIDIA GTX 770/780 -works ?
  4. Trolling on the Phoronix forums
  5. New stress testing utility for GPU's
  6. ASRock AM1H-ITX: One Of The Best AM1 Mini-ITX Motherboards
  7. Can Linux kill a motherboard?
  8. Stop grabbing my keyboard :(