Learn how to improve the swap performance on your Linux server by several orders of magnitude. Author Daniel Robbins takes you through this quick tip on getting the most from your server.

When you set up a brand new Linux server, do you create a single 128 MB swap partition? If so, did you know that you are severely limiting swap performance? Would you like to increase swap performance by several orders of magnitude, and to create swap partitions larger than 1 GB? It's possible, requiring no kernel patches or special hardware, just pure geek know-how!

Some of you may not really care about swap. After all, Linux systems are typically very memory efficient, and swap is often barely touched. While often true on desktop systems, servers are another story. Because servers may handle unexpected stresses, such as runaway processes, denial of service attacks, or even the Slashdot effect, they need to have adequate high-speed swap so that they do not grind to a halt and possibly crash when all physical memory (and then some) is exhausted.

Still not convinced that this is a big deal? I'll show you how easy it is to bring down a server by launching a massive amount of new processes. (Please, if you try this, do it only on a non-production server that you actually administer!) Let's say you have two customized grep commands in /usr/bin, called bobgrep and jimgrep. Now, let's assume that bobgrep is simply a shell script that calls the ELF executable jimgrep, as follows:

jimgrep -r $*

Everything looks good so far, but what happens if jimgrep gets accidentally replaced with a symbolic link to bobgrep? Well, in that case, calling bobgrep or jimgrep will cause an infinite loop, causing hundreds of bash processes to be spawned in mere seconds. This actually happened to me once, and believe me, it hurt!

If a server doesn't have adequate swap, a situation like this can cause the machine to lock up in much less than a minute. How do we fix the problem? One way is to increase the swap size beyond 128 MB. Fortunately for us, there is absolutely no 128 MB limit on swap under Linux 2.2.x+ and later kernels, as there was in the past. The current limits are approximately 2 GB on x86, PowerPC, and MC680x0 systems, 512 MB on MIPS systems, 128 GB on Alpha, and a whopping 3 Terabytes on UltraSparc platforms!

Swap partition size limits under modern Linux kernels
x86		    2 Gigabytes
PowerPC		    2 Gigabytes
Motorola 680x0	    2 Gigabytes
Sparc		    1 Gigabyte
MIPS		    512 Megabytes
Alpha		    128 Gigabytes
UltraSparc	    3 Terabytes

While it's nice to be able to increase swap partition size to beyond 128 MB, how about increasing performance? Ideally, it would be nice if we could set up swap partitions in a RAID 0 stripe, so that reads and writes are equally distributed between all partitions. If these partitions are on separate drives and/or controllers, this will multiply swap file performance, allowing your servers to handle temporary memory usage "spikes" without getting dramatically bogged down.

Amazingly, all modern Linux kernels, by default (with no special kernel options or patches) allow you to parallelize swap, just like a RAID 0 stripe. By using the pri option in /etc/fstab to set multiple swap partitions to the same priority, we tell Linux to use them in parallel:

Set multiple swap partitions to the same priority
/dev/sda2	none	swap	sw,pri=3	0	0
/dev/sdb2	none	swap	sw,pri=3	0	0
/dev/sdc2	none	swap	sw,pri=3	0	0
/dev/sdd2	none	swap	sw,pri=1	0	0

In the above example, Linux will use swap partitions sda2, sdb2, and sdc2 in parallel. Since these partitions are on different drives, and possibly even different SCSI controllers, read and write throughput will nearly triple. The fourth swap partition, sdd2, will be used only after the first three partitions have been exhausted.

The pri option is really easy to use. The priority must be a number between 0 and 32767, with 32767 being the highest priority. The swap partitions will be used from highest priority to lowest priority, meaning that a partition with a priority of x will only be used only if all partitions with a priority greater than x are already full. If several partitions have the same priority, Linux will automatically parallelize access between them. This allows you to not only parallelize swap, but also prioritize access so that the partitions on the fastest drives (or regions of the drives) are used first. So, you can set up an emergency swap partition on an old, slower drive that will be used only if all high-speed swap is exhausted first.