RHEL 4 - Memory Problem
Ramesh.Reddy at ubs.com
Ramesh.Reddy at ubs.com
Fri Mar 16 17:21:45 UTC 2007
Dmesg reads from /var/log/messages, when it's first reboots, you might nee memory info through dmesg, dmeg is not right command to see memory usage, free and cat /proc/meminfo are the right commands.
-----Original Message-----
From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com] On Behalf Of Troy Knabe
Sent: Friday, March 16, 2007 1:17 PM
To: General Red Hat Linux discussion list
Subject: Re: RHEL 4 - Memory Problem
dmesg |grep -i Memory
returned nothing for me.
-Troy
----- Original Message -----
From: Nuwan <nrfromlk at gmail.com>
Date: Friday, March 16, 2007 3:32 am
Subject: Re: RHEL 4 - Memory Problem
To: General Red Hat Linux discussion list <redhat-list at redhat.com>
> Try the following ;
>
> # dmesg | grep Memory:
>
> Memory: 2071680k/2097088k available (1848k kernel code, 24692k
> reserved, 752k data, 184k init, 0k highmem)
>
> This will gave u enough understanding about the linux available memory
> !
>
>
> On 3/16/07, baran.yurdagul at turkcell.com.tr
> <baran.yurdagul at turkcell.com.tr> wrote:
> > Hi,
> > If you look at the free output you will see that altough 162M
> of your memory is free, the cached memory is ~15GB which means kernel
> is ready for giving that area to any application that needs memory.
> Linux has allocated that memoy for some reason, and if it is needed it
> can give it back.
> > I hope I am clear enough.
> >
> >
> >
> > -----Original Message-----
> > From: redhat-list-bounces at redhat.com [mailto:redhat-list-
> bounces at redhat.com] On Behalf Of qua nong
> > Sent: Friday, March 16, 2007 6:50 AM
> > To: General Red Hat Linux discussion list
> > Subject: Re: RHEL 4 - Memory Problem
> >
> > Hi,
> >
> > Below is the output of free
> >
> > # free
> > total used free shared
> >buffers cached
> > Mem: 16360260
> 16197904 162356 0 256496 14974144
> > -/+ buffers/cache: 967264
> 15392996> Swap:
> 33551744 186960 33364784
> >
> > May I also ask you that as you mentioned that you run Oracle
> RAC on linux box. Do you use RHEL3 cluster or 4, GFS or OCFS ?
> >
> > Qua
> >
> >
> > ----- Original Message ----
> > From: Troy Knabe <knabe at 4j.lane.edu>
> > To: General Red Hat Linux discussion list <redhat-
> list at redhat.com>> Sent: Friday, March 16, 2007 3:20:02 PM
> > Subject: Re: RHEL 4 - Memory Problem
> >
> > Try running the command "free" I think, although I don't
> know why and would love for someone on this list to answer this
> question that this is a better actual representation of the free
> memory on the box.
> >
> > I am running the same config as you, only 3 boxes with 8 gig
> of RAM each and Oracle RAC.
> >
> > My hunch is that top and vmstat are showing the actual memory
> locations that are empty, where a "free" command shows the memory
> addresses that while may have something in them, are able to be
> recycled and used.
> >
> > Can someone verify that I am right or way off base?
> >
> > Thanks
> > -Troy
> >
> >
> > ----- Original Message -----
> > From: qua nong <quanong_os at yahoo.com>
> > Date: Thursday, March 15, 2007 9:02 pm
> > Subject: RHEL 4 - Memory Problem
> > To: redhat-list at redhat.com
> >
> > > Hi list,
> > >
> > > We have a AMD with RHEL4 64 installed and the Oracle 10g
> installed as
> > > well.
> > > It has the latest kernel update 2.6.9-42.0.8.ELsmp but
> the memory is
> > > always being used by some unexplained processes.
> > >
> > > There are 4 CPUs, 16 GB RAM, 33GB swap but memory used = 16148872k
> > >
> > > Even when oracle is shutdown, a memory use is
> still nearly 16GB. CPU
> > > is 99.4 % in idle, and I/O is too quiet. This is quite
> difficult to
> > > explain.
> > >
> > > Could anyone have any idea ?
> > >
> > > Here is the display of the top command
> > >
> > > top - 14:57:33 up 30 days, 22:29, 3 users, load
> > > average: 0.22, 0.10, 0.02
> > > Tasks: 121 total, 1 running, 120 sleeping, 0 stopped, 0
> > > zombie
> > > Cpu(s): 0.0% us, 0.0% sy, 0.0% ni, 99.4%
> id, 0.6% wa, 0.0% hi,
> > > 0.0% si
> > > Mem: 16360260k total, 16198280k used, 161980k free, 256496k
> > > buffers
> > > Swap: 33551744k total, 186960k used, 33364784k free, 14973940k
> > > cached
> > >
> > > vmstat 2
> > > procs -----------memory---------- ---swap-- -----io---- --
> system-
> > > - ----cpu----
> > > r b swpd free
> > > buff cache si so
> > > bi bo in cs us
> > > sy id wa
> > > 0 0 186960 161420 256496 14973940 0 0 1
> > > 112 3 1 0
> > > 0 99 1
> > > 0 0 186960 162284 256496 14973940 0 0 0 170
> > > 1021 2162 0 0 100 0
> > > 0 0 186960 162276 256496 14973940 0 0 0 44 1009 2149 0
> > >0
> 100 0
> > > 0 0 186960 162284 256496 14973940 0 0 0 42 1008 2244 0
> > >0
> 99 0
> > > 0 0 186960 162292 256496 14973940 0 0 0 48 1011 2164 0
> > >0
> 99 0
> > > 0 0 186960 162292 256496 14973940 0 0 0 56 1006 2118 0
> > >0
> 100 0
> > > 0 0 186960 162292 256496 14973940 0 0 0 66 1011 2154 0
> > >0
> 98 2
> > >
> > >
> > >
> > > cat /proc/meminfo
> > > MemTotal: 16360260 kB
> > > MemFree: 162740 kB
> > > Buffers: 256496 kB
> > > Cached: 14973940 kB
> > > SwapCached: 9724 kB
> > > Active: 2709340 kB
> > > Inactive: 12799980 kB
> > >
> HighTotal: 0 kB
> > >
> HighFree: 0 kB
> > > LowTotal: 16360260 kB
> > > LowFree: 162740 kB
> > > SwapTotal: 33551744 kB
> > > SwapFree: 33364784 kB
> > >
> Dirty: 332 kB
> > > Writeback:
> 140 kB
> > > Mapped: 1147256 kB
> > >
> Slab: 608056 kB
> > > CommitLimit: 41731872 kB
> > > Committed_AS: 7853044 kB
> > > PageTables: 39080 kB
> > > VmallocTotal: 536870911 kB
> > > VmallocUsed: 16760 kB
> > > VmallocChunk: 536854071 kB
> > > HugePages_Total: 0
> > > HugePages_Free: 0
> > > Hugepagesize: 2048 kB
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Troy Knabe
Senior Systems Administrator
Computing and Information Services
4J School District
knabe at 4j.lane.edu
Ph: 541.687.3587
Cell: 541.968.0780
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