something like sar for memory?
Daniel Carrillo
daniel.carrillo at gmail.com
Tue Jun 30 12:15:48 UTC 2009
2009/6/30 ESGLinux <esggrupos at gmail.com>:
> Well,
> Now I get the info with sar comes the problem to understand the results.
>
> Allways I try to see the real used memory in linux I have the same problem,
> it seems that it´s using ALL the memory.
>
> with sar -r:
> kbmemfree kbmemused %memused kbbuffers kbcached kbswpfree
> kbswpused %swpused kbswpcad
> 12:55:01 408540 3740728 90,15 391560 1191012
> 4096200 332 0,01 48
>
> my system has 4GB and it looks it has 3,7G in use, but I don´t think it´s
> true.
>
> with the free -m command:
>
> free -m
> total used free shared buffers
> cached
> Mem: 4052 3705 346 0 384 1217
> -/+ buffers/cache: 2103 1948
> Swap: 4000 0 4000
>
> the result is the same, but I have heard that the real free memory is the
> in the colum free in the -/+ buffers/cache, is it true?
>
> with vmstat as Manuel suggests:
>
> vmstat -s -S m
> 4248 m total memory
> 3907 m used memory
> 2992 m active memory
> 738 m inactive memory
> 341 m free memory
> 404 m buffer memory
> 1289 m swap cache
> 4194 m total swap
> 0 m used swap
> 4194 m free swap
> ....
>
> what is command I get other results
>
> so how many memory are free on my system :-( ?
>
Usually, all the commands take the information from:
/proc/meminfo (you can 'cat' it)
I suggest the read of
http://virtualthreads.blogspot.com/2006/02/understanding-memory-usage-on-linux.html
Hope this helps.
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