Autarchy of the Private Cave

LinuxAteMyRAM (also as a PDF: Linux disk caching effects)

To examine the behavior of your Linux box disk caching under specific loads, see Linux write cache mystery (PDF).

To understand what is going on, see also The Linux Page Cache and pdflush (PDF) by the same author, Gregory Smith.

Another useful resource is OpenSUSE’s Tuning the Memory Management Subsystem, which nicely explains some of the kernel cache/memory-related configuration options.

As described in my previous post, there are some rather simple mechanisms to enable visitor’s browser to cache content, and avoid unnecessary load on your servers. In this post I’ll take a look at some parts of the practical implementation of the caching mechanism on the server, using PHP.
Read the rest of this entry »