something like sar for memory?

[Geofrey Rainey]

Linux will always maximize the available memory so you'll generally see 
High usage all the time, this is quite normal.



-----Original Message-----
From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com] On Behalf Of ESGLinux
Sent: Wednesday, 1 July 2009 12:07 a.m.
To: General Red Hat Linux discussion list
Subject: Re: something like sar for memory?

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 :-( ?

ESG









2009/6/30 ESGLinux <esggrupos at gmail.com>

> Hi,
>
> thanks for your answer, what I was looking for is just sar ;-)
>
> Now I feel a bit stupid, I always run sar without parameters and I didn´t
> realized it could give me the info I was looking for.
>
> Thanks again
>
> Greetings
>
> ESG
>
>
>
> 2009/6/30 Daniel Carrillo <daniel.carrillo at gmail.com>
>
> 2009/6/30 ESGLinux <esggrupos at gmail.com>:
>> > Hi all,
>> > I´m looking for a command or tool that gives a detailed memory usage
>> across
>> > time like sar does with CPU,
>> >
>> > Do you know something like that?
>>
>> sar -r
>>
>> man sar
>>
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