RHEL 4 - Memory Problem

[Troy Knabe]

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