12-22-2011
Generally, no. Servers can operate weeks to months at a go, potentially years if it wasn't for kernel upgrades.
Often people do so because they see the value of "free" memory creeping very low and "cached" climbing very high, then reboot to forestall what they perceive as impending disaster. Many try putting strange settings into /proc/ to "flush the cache", as well. This isn't necessary, low free/high cache is normal operation, just count the value of "cached" in your estimation of free memory and usually everything is fine after all.
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FREE(1) Linux User's Manual FREE(1)
NAME
free - Display amount of free and used memory in the system
SYNOPSIS
free [-b|-k|-m|-g] [-c count] [-l] [-o] [-t] [-s delay] [-V]
DESCRIPTION
free displays the total amount of free and used physical and swap memory in the system, as well as the buffers used by the kernel. The
shared memory column should be ignored; it is obsolete.
OPTIONS
-b Display the amount of memory in bytes.
-c count
Display the result count times. Requires the -s option.
-g Display the amount of memory in gigabytes.
-k Display the amount of memory in kilobytes. This is the default.
-l Show detailed low and high memory statistics.
-m Display the amount of memory in megabytes.
-o Display the output in old format, the only difference being this option will disable the display of the "buffer adjusted" line.
-s Continuously display the result delay seconds apart. You may actually specify any floating point number for delay, usleep(3) is used
for microsecond resolution delay times.
-t Display a line showing the column totals.
-V Display version information.
FILES
/proc/meminfo memory information
AUTHORS
Written by Brian Edmonds.
Send bug reports to <albert@users.sf.net>
SEE ALSO
ps(1), slabtop(1), top(1), vmstat(8).
Cohesive Systems 5 Oct 2009 FREE(1)