Re: What is using the memory

On 26/06/07, George Thompson <george@twig.tk> wrote:
> Running RHEL4
>
> We are uing weblogic which has three java proceses. The sum of the
> percentage memory used of these processes is about 42% .
>
> ps -aux | grep java | gawk '{ print $11, $4}'
> /opt/od-home/OpenDeployNG/jre/bin/java 0.3
> /opt/java/liveJava/bin/java 24.2
> /opt/java/liveJava/bin/java 18.1
>
>
> If I do ps -aux and add up all the %cpu coulums it totals about 45%. Yet
> when i look at sar -r
>
> sar -r | gawk '{ print $1, $2, $5}' | head
> 12:00:01 AM %memused
> 12:10:01 AM 99.76
> 12:20:01 AM 99.72
>
> It seems to think the memory is 99% used. But I cant see any other
> processes in the process table using any significant memory.
>
> Here is the contents of /proc/meminfo . I dont fully understand what all
> the entries mean.
>
> [root@web1]/etc# cat /proc/meminfo
> MemTotal: 8164748 kB
> MemFree: 164748 kB
> Buffers: 108356 kB
> Cached: 478412 kB
> SwapCached: 38628 kB
> Active: 3690740 kB
> Inactive: 409064 kB
> HighTotal: 0 kB
> HighFree: 0 kB
> LowTotal: 8164748 kB
> LowFree: 164748 kB
> SwapTotal: 16779884 kB
> SwapFree: 16643592 kB
> Dirty: 2508 kB
> Writeback: 0 kB
> Mapped: 3529560 kB
> Slab: 185824 kB
> CommitLimit: 20862256 kB
> Committed_AS: 7658544 kB
> PageTables: 13484 kB
> VmallocTotal: 536870911 kB
> VmallocUsed: 271300 kB
> VmallocChunk: 536599035 kB
> HugePages_Total: 0
> HugePages_Free: 0
> Hugepagesize: 2048 kB
> [root@weblogic1]/etc#
>
> Our customer is asking us to explain what is using the memory and we have
> no answer.
>
> George

If you'd like a more detailed explanation than Joseph's reply, check out http://gentoo-wiki.com/FAQ_Linux_Memory_Management or use your favorite web browser and search for "linux memory management".

Kind regards,

Herta

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