When your Linux server starts feeling sluggish, you might benefit from looking at your swap space and gauging whether it's adequately sized for your system's workload. Fortunately, Linux has some handy commands for helping you get a good picture of your system's behavior.
Setting your swap space to be twice the size of your RAM is a good rule of thumb, but systems with very large amounts of memory likely won't likely need anywhere near that amount of swap. Besides, adding it later is easy if you have adequate disk space.
Source: http://www.infoworld.com/t/linux/managing-swap-space-linux-systems-196068?source=rss_data_center
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