[K12OSN] memory issues

[Huck]

            total       used       free     shared    buffers     cached
Mem:       4153708    4059868      93840        0     498456    2761424
-/+ buffers/cache:     799988    3353720
Swap:      2040244          0    2040244


that's my free...I know I got enough ram..but when 8 kids open of OO 
writer or calc all at once...talk about a lagged system...then again I 
think maybe it has to do with network saturation by one or two browers 
do'n multi-media things.

Petre Scheie wrote:
> What does free show?  Top doesn't seem to show how much RAM is allocated 
> to cache (hmm, never noticed that before).  Free does.  Remember, for 
> efficiency, Linux allocates most of unused RAM to file caching under the 
> theory that it's wasteful to have memory standing around not be used.  
> Here's what free shows on one of my systems:
> 
>              total       used       free     shared    buffers     cached
> Mem:       2010576    1946448      64128          0     160108    1009868
> -/+ buffers/cache:     776472    1234104
> Swap:      2096472          8    2096464
> 
> The memory used shows nearly all of the 2GB, 1946448K, in the server 
> being used; but it also shows that 1009868K of that is devoted to 
> cache.  As demand for more memory for apps goes up, the kernel will take 
> memory used for caching and devote to the apps.  In your case, your swap 
> used is still 0 which is what you want.  In other words, you have enough 
> RAM.
> 
> Petre
> 
> Huck wrote:
> 
>> top - 11:34:14 up 23:45,  1 user,  load average: 6.18, 5.67, 3.73
>> Tasks: 323 total,   5 running, 318 sleeping,   0 stopped,   0 zombie
>> Cpu(s): 12.7% us,  6.4% sy,  0.1% ni, 76.9% id,  0.0% wa,  0.2% hi,  
>> 3.6% si
>> Mem:   4153708k total,  4094596k used,    59112k free,   479060k buffers
>> Swap:  2040244k total,        0k used,  2040244k free,  2787320k cached
>>
>>
>> 1 user is a lie of course there are at least 12 people logged in...
>> I don't see any reason for this much memory to be getting sucked up 
>> though...they are all running firefox AND/OR openoffice writer.
>>
>> any ideas? I remember seeing a long while ago some cmd-line tool to 
>> track memory usage ever-so-often...I've searched the archives and 
>> google'd without luck finding it. anyone remember? thought it was like 
>> "memd" or something
>>
>> --Huck
>>
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