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@xxxxxxxxxxx>
To: General Red Hat Linux discussion list <redhat-list@xxxxxxxxxx>
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@xxxxxxxxx>
Date: Thursday, March 15, 2007 9:02 pm
Subject: RHEL 4 - Memory Problem
To: redhat-list@xxxxxxxxxx
> 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@xxxxxxxxxxx
Ph: 541.687.3587
Cell: 541.968.0780
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