RHEL 4 - Memory Problem

Nuwan nrfromlk at gmail.com
Fri Mar 16 05:45:10 UTC 2007 

Are you using the hugemem kernel ?!


On 3/16/07, qua nong <quanong_os at yahoo.com> wrote:
> 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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