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

Facebook's Flashcache For The Linux Kernel

Free Software

Published on 25 September 2011 05:55 PM EDT
Written by Michael Larabel in Free Software
23 Comments

Facebook has made many open-source contributions over the years from their high-performance PHP-To-C++ compiler, to parts of their infrastructure, to some of their development tools. One of their open-source projects they made public last year for increasing their database performance was Flashcache. Flashcache is a kernel module that provides a block cache for Linux with various caching modes.

Flashcache was released by Facebook in April of 2010. There isn't any major news from Facebook about this caching module today, but while catching up on my notes at Oktoberfest and deciding what to benchmark upon my return next month, Flashcache was re-visited.

Flashcache can provide a simple persistent block cache to accelerate readers and writes from slower rotational media while caching the data on solid-state storage. Facebook originally designed this module to accelerate their MySQL database workloads, but it's a generic caching module for any disk-heavy workload.

Flashcache currently provides three caching modes: writeback, writethrough, and writearound. These modes plus how to use the kernel module and respective user-land utility can be found in their documentation.

This Facebook project hasn't been merged into the mainline Linux kernel, but it's GPL licensed and is available from GitHub.

Would you be interested in seeing benchmarks of Facebook's Flashcache in the coming weeks? Share your thoughts in the forums.

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. Intel Launches The Core i7 5960X, Mighty Powerful Haswell-E CPUs
  2. AMD Radeon R9 290: Gallium3D vs. Catalyst Drivers
  3. AMD Radeon R9 290 Open-Source Driver Works, But Has A Ways To Go
  4. Trying The Configurable 45 Watt TDP With AMD's A10-7800 / A6-7400K
Latest Linux Articles
  1. Testing For The Latest Linux Kernel Power Regression
  2. The Most Energy Efficient Radeon GPU For AMD Linux Gaming
  3. 20-Way Radeon Comparison With Open-Source Graphics For Steam On Linux Gaming
  4. Preview: OS X 10.10 Yosemite vs. Ubuntu Linux GPU Performance
Latest Linux News
  1. A New AMD Catalyst Linux Driver Unofficially Surfaces
  2. LibreOffice Ported To 64-bit ARM (AArch64)
  3. Enlightenment E19 RC3 Shows Off The New Wayland Compositor
  4. Metro Redux Is Going To Require OpenGL 4.x On Linux
  5. Jailhouse v0.1 Released As A Basic Hypervisor For Linux
  6. Google's Chromebook "Samus" Now Supported By Coreboot
  7. Chrome 38 Now In Beta With Exciting Advancements
  8. Ubuntu's Utopic Unicorn 14.10 Beta 1 Released
  9. Genode OS 14.08 Has New GUI Architecture, Pluggable VFS
  10. Another Intel Linux Power Regression Is Being Investigated
Latest Forum Discussions
  1. Catalyst 14.201.1008
  2. Btrfs Gets Talked Up, Googler Encourages You To Try Btrfs
  3. Users defect to Linux as OpenBSD removes Lynx from base system
  4. Updated and Optimized Ubuntu Free Graphics Drivers
  5. Canonical Joined The Khronos Group To Help Mir/Wayland Drivers
  6. Radeon HD5670 and Ubuntu 14.04
  7. AMD Releases UVD Video Decode Support For R600 GPUs
  8. Best Radeon for a Power Mac G5?