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 Xeon E5-1680 v3 & E5-2687W v3 Compared To The Core i7 5960X On Linux
  2. Intel 120GB 530 Series SSD Linux Performance
  3. Btrfs/EXT4/XFS/F2FS RAID 0/1/5/6/10 Linux Benchmarks On Four SSDs
  4. AMD's Windows Catalyst Driver Remains Largely Faster Than Linux Drivers
Latest Linux Articles
  1. NVIDIA vs. Nouveau Drivers With Linux 3.18 + Mesa 10.4-devel
  2. Is The Open-Source NVIDIA Driver Fast Enough For Steam On Linux Gaming?
  3. Linux 3.18 File-System Performance Minimally Changed But Possible Regressions
  4. AMD Radeon Gallium3D Is Catching Up & Sometimes Beating Catalyst On Linux
Latest Linux News
  1. Gngr: A New Web Browser Focused On Privacy
  2. Linux 3.18 Kernel: Not Much Change With Intel Haswell Performance
  3. More File-System Tests Of The Linux 3.18 Kernel
  4. Using NVIDIA's NVENC On Linux With FFmpeg
  5. There's Talk Again About An "Open To The Core" Ubuntu Laptop
  6. PowerVR SGX Driver Code Gets Leaked
  7. V2 Of KDBUS Published For Linux Kernel Review
  8. VirtualBox 4.3.20 Arrives, Still No Sign Of VirtualBox 4.4
  9. Scientific Linux 6.6 vs. Scientific Linux 7.0 Benchmarks
  10. Qualcomm Looks To Get Into The ARM Server Business
Latest Forum Discussions
  1. Debian Developer Resigns From The Systemd Maintainership Team
  2. Roadmap to Catalyst 14.10 ?
  3. Updated and Optimized Ubuntu Free Graphics Drivers
  4. Cant get working Kaveri APU - A10-7850k
  5. Script for Fan Speed Control
  6. Debian Init System Coupling Vote Results
  7. The Slides Announcing The New "AMDGPU" Kernel Driver
  8. Ubuntu Developers Still Thinking What To Do About Adobe Flash Support