[rhn-users] Question on memory usage

[Rigoberto Corujo]

Thank you for your reply, Frank.

What I don't understand is that, on n11, there is
6289408 - 4896448 = 1392960 kB of swap being used, but
there is 2521308 kB of free memory.  Since there is
still 2521308 kB of free memory, why would any swap be
needed at all?

The swappiness setting is the same on both machines
and has not been modified.

By the way, I forgot to mention that the version of
Linux is 2.6.9-34.

Rigoberto

--- "Lamon, Frank III" <Frank_LaMon at csx.com> wrote:

> Something doesn't jive here - n11 has done some
> swapping and the OS "not running
> anything other than the same minimal set of
> processes" would not swap with 4GB of physical
> memory. Something is requiring memory here and maybe
> the swappiness setting has been modified, the OS
> just sitting there won't swap.
> 
> -----Original Message-----
> From: rhn-users-bounces at redhat.com
> [mailto:rhn-users-bounces at redhat.com]On Behalf Of
> Rigoberto Corujo
> Sent: Monday, January 22, 2007 5:05 PM
> To: rhn-users at redhat.com
> Subject: [rhn-users] Question on memory usage
> 
> 
> Hello,
> 
> I have two machines which have the same amount of
> total memory.  When the machines are booted, the
> amount of free memory is the same as shown by
> "/proc/meminfo".  After a period of time, the amount
> of free memory differs betweem the two machines even
> though, at the time I'm taking a reading of
> "/proc/meminfo", both machines are not running
> anything other than the same minimal set of
> processes.
>  That is, no user apps.  Just the bare bones system
> processes.
> 
> Here's an example of two machines, n5 and n11, and
> their "/proc/meminfo" values.  Can someone explain
> why
> this situation would occur and is there any why to
> tell Linux to reclaim any memory that's not actually
> being used?
> 
> [root at n5 ~]# cat /proc/meminfo
> MemTotal:      4037388 kB
> MemFree:       3814020 kB
> Buffers:         24868 kB
> Cached:          61404 kB
> SwapCached:      60064 kB
> Active:          34188 kB
> Inactive:       119224 kB
> HighTotal:           0 kB
> HighFree:            0 kB
> LowTotal:      4037388 kB
> LowFree:       3814020 kB
> SwapTotal:     6289408 kB
> SwapFree:      6228780 kB
> Dirty:               0 kB
> Writeback:           0 kB
> Mapped:          24776 kB
> Slab:            37776 kB
> Committed_AS:    50692 kB
> PageTables:       1232 kB
> VmallocTotal: 536870911 kB
> VmallocUsed:     15788 kB
> VmallocChunk: 536855115 kB
> HugePages_Total:     0
> HugePages_Free:      0
> Hugepagesize:     2048 kB
> 
> 
> [root at n11 ~]# cat /proc/meminfo
> MemTotal:      4037388 kB
> MemFree:       2521308 kB
> Buffers:         17676 kB
> Cached:          27108 kB
> SwapCached:    1392056 kB
> Active:          39660 kB
> Inactive:      1403784 kB
> HighTotal:           0 kB
> HighFree:            0 kB
> LowTotal:      4037388 kB
> LowFree:       2521308 kB
> SwapTotal:     6289408 kB
> SwapFree:      4896448 kB
> Dirty:               0 kB
> Writeback:           0 kB
> Mapped:          24324 kB
> Slab:            40444 kB
> Committed_AS:    50832 kB
> PageTables:       1232 kB
> VmallocTotal: 536870911 kB
> VmallocUsed:     15788 kB
> VmallocChunk: 536855115 kB
> HugePages_Total:     0
> HugePages_Free:      0
> Hugepagesize:     2048 kB
> 
> Thank you.
> 
> Rigoberto
> 
> 
>  
>
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