28.12. Optimizing Disk-Based Sessions
Many Web applications use HTTP sessions to retain information about specific users for the duration of their visit. The default and most common storage for the session information is disk files, located in /tmp. With heavily loaded Web sites that serve large number of users, accessing the session store on the disk may become extremely inefficient, since most file systems (including Linux's ext2 and Windows' NTFS) don't handle a large number of files in the same directory very efficiently. As the number of files in the /tmp directory grows due to a large number of active sessions, the time it takes to open each session file becomes longer.
A good first step would be moving the session storage directory from ...
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