Linux and other Unix-like operating systems use the term “swap” to describe both the act of moving memory pages between RAM and disk, and the region of a disk the pages are stored on. It is common to use a whole partition of a hard disk for swapping. However, with the 2.6 Linux kernel, swap files are just as fast as swap partitions. Now, many admins (both Windows and Linux/UNIX) follow an old rule of thumb that your swap partition should be twice the size of your main system RAM. Let us say I’ve 32GB RAM, should I set swap space to 64 GB? Is 64 GB of swap space really required? How big should your Linux / UNIX swap space be?

Note: This article is part of my OS Install Experiences series.

OK, so let's start with something simple: Debian. Simple in the sense that there probably won't be too many surprises for me as a Debian developer (or for most readers of Planet Debian). For other people this might be interesting, though, and some facts are probably interesting to one or the other experienced Debian user/developer, too...

UPDATE: The info in this post is deprecated. See the new post about eAccelerator instead.

I installed Turck MMCache PHP accelerator and I got a big improvement.

ApacheBench reported 4.52 pages per second before and 12.47 pages after installation (a Wordpress 1.5.2 page on a 1.2Ghz PIII). That a 275% increase in performance, with currently no observed problems. I tested this with both Apache2 and lighttpd, and got a similar boost with both.