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Software

There's Another Linux Kernel Power Problem

After last year discovering a major Linux kernel power regression that was widely debated until the Phoronix test automation software bisected the problem to get to the bottom of the situation, there's more active power regressions today on the Linux desktop. As I've mentioned on Twitter and in other articles in weeks prior there's a few regressions, but one of them for at least some notebooks is causing a very significant increase in power consumption. This situation that remains unresolved as of the Linux 3.7 kernel can cause the system to be going through about 20% more power.
9 December 2012 - 40 Comments

LLVM/Clang vs. GCC On The ARM Cortex-A15 Preview

The latest ARM Cortex-A15 benchmarks on Phoronix is an extension of the earlier compiler testing from this modern ARM CPU found on the Samsung Exynos 5 Dual within the Samsung Chromebook. In this round of performance testing, the LLVM/Clang compiler performance is compared to recent releases of the GNU Compiler Collection on this latest-generation ARM hardware.
1 December 2012 - 5 Comments

ARM Cortex-A15 Exynos5 Compiler Benchmarks

Due to there being much interest in the ARM Cortex A15 benchmarks on Linux, namely with the Samsung Chromebook and its Samsung Exynos 5 Dual, here's a weekend special providing some GCC compiler benchmarks of this new ARM chip.
24 November 2012 - 5 Comments

Linux 3.7 File-System Benchmarks: EXT4, Btrfs, XFS

In this article are benchmarks of the latest Linux 3.7 kernel development code of the EXT4, XFS, and Btrfs file-systems.
19 November 2012 - 15 Comments

EXT4 File-System Tuning Benchmarks

Following last month's Btrfs file-system tuning benchmarks, in this article are a similar set of tests when stressing the EXT4 file-system with its various performance-related mount options. Here are a number of EXT4 benchmarks from Ubuntu 12.10 with different mount option configurations.
16 November 2012 - 10 Comments

Benchmarking LLVM/Clang 3.2, GCC 4.8, DragonEgg Compilers

Earlier this week I shared some updated benchmarks of the latest development code for LLVM/Clang 3.2 on an Intel Core i7 processor. Now from this same setup to complement the LLVM 3.1/3.2 benchmarks are results of the GCC 4.7.2 compiler, the latest GCC 4.8 development snapshot, and benchmarks of GCC when using LLVM's DragonEgg 3.1/3.2-SVN optimizer plug-in.
9 November 2012 - 7 Comments

Four-Way ARM Linux Distribution Comparison

The latest ARM Linux benchmarks to share at Phoronix is a comparison of Ubuntu 12.10, Linaro 12.10, Fedora 17, and Arch Linux when running from the dual-core Cortex-A9 OMAP4460-based PandaBoard ES development board.
7 November 2012 - 14 Comments

LLVM/Clang 3.2 SVN On Intel Core i7

With LLVM/Clang 3.2 being released next month and the code branching occurring this month, here's some new benchmarks from the latest SVN development snapshot as of this weekend. LLVM/Clang 3.2 SVN benchmarks were compared to the earlier LLVM 3.1 and 3.0 releases for reference.
5 November 2012 - 7 Comments

GCC 4.8 Compiler On AMD's Eight-Core Piledriver

This month from CPUs based upon AMD's new Piledriver micro-architecture I have delivered results of compiler tuning on AMD's Open64 compiler as well as GCC bdver2 tuning. That initial testing from an AMD FX-8350 Eight-Core processor didn't show any big boost out of the "bdver2" target with the new BMI/TBM/F16C/FMA3 instruction set extensions. Testing in this article from the AMD FX-8350 are GCC compiler benchmarks of the 4.6.3, 4.7.2, and 4.8.0 development snapshots to look for performance improvements on this new high-end AMD processor when using the very latest GCC compiler code.
30 October 2012 - 2 Comments

FX-8350 Piledriver Tuning On AMD's Open64 Compiler

With this week's unveiling of the FX-8350 eight-core processor being based on AMD's new Piledriver architecture, in this article are benchmarks when testing out the Piledriver "bdver2" optimizations within AMD's own Open64 compiler.
24 October 2012 - 1 Comment

451 software articles published on Phoronix.
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