Server Has 7 GBs Of Free RAM

Oct 27, 2009

Current server has 4 GB ram, all buffered by linux.

Code:

total used free shared buffers cached
Mem: 4054 3917 137 0 99 2139
-/+ buffers/cache: 1678 2375
Swap: 4094 0 4094

The buffer has 2375 MB of free ram. However this is a heavy mysql server. I want the empty ram be used by mysql so it becomes faster.

We are currently moving to a 8GB ram server, and the free ram will be around 7 GB if we use the exact same configuration. I want the free ram to be 1 GB at most, why pay for 8 GB ram if I'm going to use a fraction of it?

What optimizations should I attempt?

I know about harddisk I/O bottlenecks, I have two SATA drives in the system, and a SAS drive dedicated to mysql, that's all we can afford currently.

All mysql databases are for SMF forums, and currently using MyISAM tables. Switching to another storage engine is a possibility, if it won't create problems in restarts and hot backups.

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top - 20:50:53 up 2 days, 7:05, 2 users, load average: 69.58, 41.63, 24.91
Tasks: 397 total, 57 running, 334 sleeping, 1 stopped, 5 zombie
Cpu(s): 1.9% us, 96.5% sy, 0.1% ni, 0.0% id, 0.0% wa, 0.5% hi, 1.0% si
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[17379796.260000] HighMem 59*4kB 3*8kB 0*16kB 0*32kB 0*64kB 1*128kB 1*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 664kB
[17379796.260000] Swap cache: add 6615861, delete 6615849, find 2695269/27558673, race 0+86
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[17379796.260000] Swap cache: add 6615861, delete 6615849, find 2695269/27558673, race 0+86

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Code:
#!/bin/bash
#
# Revised 02-Feb-2007: include kernel memory (kmemsize) in 'used' calculation
# and show percentages in output.
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BEAN=`cat /proc/user_beancounters`
GUAR=`echo "$BEAN" | grep vmguar | awk '{ print $4;}'`
PRIV=`echo "$BEAN" | grep privvm | awk '{ print $2;}'`
KMEM=`echo "$BEAN" | grep kmem | awk '{ print $3;}'`

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