Just recently I started generating graph's of system resource usage on some
of my linux machines. On a certain group of machines I noticed a steady
level of between 90% and 100% memory usage (while at the same time, swap
usage remains flat at 0%). Here is an example of what top shows on this Red
Hat machine:
2:43am up 289 days, 11:38, 1 user, load average: 0.02, 0.01, 0.00
44 processes: 43 sleeping, 1 running, 0 zombie, 0 stopped
CPU states: 0.0% user, 0.4% system, 0.0% nice, 99.4% idle
Mem: 1036248K av, 900928K used, 135320K free, 26896K shrd, 321320K buff
Swap: 514040K av, 2056K used, 511984K free 548796K cached
Looking at the graph I jumped but then after investigation and seeing things
like the above I'm assuming this is expected behavior. But the Q's are:
1) Why is memory usage so high when it shouldn't be?
Note: looking at the process that are running (most httpd), they don't
amount to much more that 30mb.
2) How can I determine TRUE memory usage?
any help or references to tfm are greatly appreciated...
Thanks
--
Nathan Fain
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