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04-02-2004 11:37 AM
04-02-2004 11:37 AM
Memory usage on RH Advance Server 2.1/3.0
I'm running the AS 2.1 e.30+ and AS 3.
On some of the systems sar consistently shows average memory usage of 99%. Is there a tool that will display the right value? A while back I read that this was "a feature and not a bug" and there was a way to derive the value from something like 'free'. Does anyone have the formula for that?
thanks,
Sam.
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04-02-2004 03:51 PM
04-02-2004 03:51 PM
Re: Memory usage on RH Advance Server 2.1/3.0
what is different between "some" of the systems. Are you maybe running a database that is using the "free" memory for caches?
Greetings, Martin
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04-02-2004 05:08 PM
04-02-2004 05:08 PM
Re: Memory usage on RH Advance Server 2.1/3.0
This will show how much is assigned, unassigned, how much is used as caches and buffers.
Reading the details in tye kernel-documentation in 'proc.txt' (/usr/share/doc/kernel-doc-*/filesystems/proc.txt) will give details as to what the different values mean.
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04-02-2004 05:11 PM
04-02-2004 05:11 PM
Re: Memory usage on RH Advance Server 2.1/3.0
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04-03-2004 08:11 PM
04-03-2004 08:11 PM
Re: Memory usage on RH Advance Server 2.1/3.0
if you just see "no fee memory" in your linux - it's OK because kernel takes all available RAM for buffers/cache; see
http://home.earthlink.net/~jknapka/linux-mm/vmoutline.html
http://www.skynet.ie/~mel/projects/vm/
for details
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04-04-2004 10:59 AM
04-04-2004 10:59 AM
Re: Memory usage on RH Advance Server 2.1/3.0
/usr/share/doc/kernel-doc-*/sysctl/vm.txt
Ha! Thanks for the mind-kick Vitaly!
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04-05-2004 03:16 AM
04-05-2004 03:16 AM
Re: Memory usage on RH Advance Server 2.1/3.0
Martin: All of the systems (running RH AS) behaves this way.
Here are the values I get from /proc/meminfo, 'free', 'top', 'vmstat':
Used: 6G
free: 25M
Shared: 0
Buffer: 255M
Cached: 5G
And the dual CPU system is completely idle.
Vitaly/Stuart: The VM docs are fine but none of them give me a way to extrapolate how much mem is actually in use from the numbers.
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04-05-2004 11:45 AM
04-05-2004 11:45 AM
Re: Memory usage on RH Advance Server 2.1/3.0
It says take the used values, subtract the cache and buffers, and you're getting close to the amount actually used by the applications.
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04-06-2004 08:08 AM
04-06-2004 08:08 AM
Re: Memory usage on RH Advance Server 2.1/3.0
Andy