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High RAM usage, extremely low swapping

 
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Old 04-16-2012
High RAM usage, extremely low swapping
Hi team

I have three physical servers running on Red Hat Enterprise Linux Server release 6.2 with the following memory conditions:

Code:
# cat /proc/meminfo | grep -i mem
MemTotal:        8062888 kB
MemFree:          184540 kB
Shmem:               516 kB

and the following swap conditions:

Code:
# cat /proc/meminfo | grep -i swap
SwapCached:          688 kB
SwapTotal:      10305528 kB
SwapFree:       10302584 kB

# cat /proc/sys/vm/swappiness
60

# swapon -s
Filename                                Type            Size    Used    Priority
/dev/dm-1                               partition       10305528        2944    -1

As you can see the swapspace is double the size of memory and yet the swap usage is relatively low compared to actual memory usage:

Code:
# free -mt
                     total       used       free     shared    buffers     cached
Mem:          7873       7693        179          0        380       4241
-/+ buffers/cache:       3071       4802
Swap:        10063          2      10061
Total:       17937       7696      10241

I am trying to understand why the processes are not using swap instead, but relying on RAM until it reached a critical level of 97% last weekend (sorry, haven't got the numbers all I have are charts from nagios) How can I make the process use swap instead of so much of RAM?

Having an aye-karamba moment here
Smilie
 
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