On Tue, 11 Apr 2006, Eric Warnke wrote:
What you are seeing appears to be normal block device caching under
the linux kernel and nothing to worry about.
To explain:
buffers = i/o (disk) write buffers
cache = i/o (disk) read cache
These are dynamic. Linux works on the principle that if the memory isn't
being used by software then it can be used for housekeeping.
As software demands increase, buffers and cache will decrease.
I'm noticing extremely heavy memory loads when running a large bacula
job. The system running the fd and director processes spikes to
using all but about 18mb of the 5gb of memory installed. If I sort
by memory usage in Top, no processes are using anywhere near the
missing memory, however the usage only spikes when I run a large
backup job ~100 GB) from this machine.
That's what I would expect.
If I shut down bacula
completely, the memory loads don't go back down
It won't. See above.
"free" memory in Linux is the amount of ram not being used for i/o
buffering or the programs themselves - if you are seeing large amounts of
free memory after a few days of operation then you probably have more ram
in the machine than it actually needs for the tasks it is performing.
AB
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