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Full Discussion: out of memory?
Operating Systems Linux out of memory? Post 302678709 by GKnight on Sunday 29th of July 2012 01:28:03 PM
Old 07-29-2012
Forgot to mention, this is RHEL 5.5 (64-bit). 24GB of physical memory.

Yes I agree the server was extremely slow because of constant swapping which I figured by 0 free swap space.

To be honest I have more experience with Solaris than linux, and I've seen similar issue on Solaris (no free swap memory so the server is extremely slow). However, in such situation I would see very low free memory (less than 1 GB). What puzzled me is why I had 18GB free and the server was acting as if it was out of memory. Unless I'm reading the output of these commands wrong?
 

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FREE(1) 							   User Commands							   FREE(1)

NAME
free - Display amount of free and used memory in the system SYNOPSIS
free [options] 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 The shared memory column should be ignored; it is obsolete.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, --bytes Display the amount of memory in bytes. -k, --kilo Display the amount of memory in kilobytes. This is the default. -m, --mega Display the amount of memory in megabytes. -g, --giga Display the amount of memory in gigabytes. --tera Display the amount of memory in terabytes. -h, --human Show all output fields automatically scaled to shortest three digit unit and display the units of print out. Following units are used. B = bytes K = kilos M = megas G = gigas T = teras If unit is missing, and you have petabyte of RAM or swap, the number is in terabytes and columns might not be aligned with header. -c, --count count Display the result count times. Requires the -s option. -l, --lohi Show detailed low and high memory statistics. -o, --old Display the output in old format, the only difference being this option will disable the display of the "buffer adjusted" line. -s, --seconds seconds 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. --si Use power of 1000 not 1024. -t, --total Display a line showing the column totals. --help Print help. -V, --version Display version information. FILES
/proc/meminfo memory information SEE ALSO
ps(1), slabtop(1), top(1), vmstat(8). AUTHORS
Written by Brian Edmonds. REPORTING BUGS
Please send bug reports to <procps@freelists.org> procps-ng September 2011 FREE(1)
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