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Re: something like sar for memory?



Hi,
My problem is that I want to know the amount of memory to adjust the
parameters of my Apache y tomcat servers.

without this information I don´t know how to tune them.

ESG

2009/7/1 Geofrey Rainey <Geofrey Rainey tvnz co nz>

> 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 redhat com [mailto:
> redhat-list-bounces 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愀 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愒 think it愀
> 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 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愒
> > realized it could give me the info I was looking for.
> >
> > Thanks again
> >
> > Greetings
> >
> > ESG
> >
> >
> >
> > 2009/6/30 Daniel Carrillo <daniel carrillo gmail com>
> >
> > 2009/6/30 ESGLinux <esggrupos gmail com>:
> >> > Hi all,
> >> > I惴 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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> >
> >
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