[rhn-users] Out of Memory Problem

[Raj Kumar]

Hi normand,

Thanks for replying to my post!

Yes, I got memory (big) problems!! I agree, the kernel will try to use all the memory to cache user files. However, after sometime the cached value is decreasing and used value increasing... indicating pages used for cache are released to meet the memory requirements. 


 free -m
             total       used       free     shared    buffers     cached
Mem:          1001        892        108          0         28         48
-/+ buffers/cache:        815        185
Swap:         1996          0       1996
  

-/+ buffers/cache:        815        185
                          ^^^
This value is slowly increasing... that means memory used by application is increasing! 

Ref: http://rimuhosting.com/howto/memory.jsp

>>  size-64          4825410 4825410    128 160847 160847    1 : 1008  
Someone should free the cache pages... I dont think I have that many pages active when I ran the command. This never decreases! On a similar machine this number increases and decreases. 

It would be useful to find who is requesting more objects from this pool. I am suspecting NFS is the culprit since when I write files from an NFS client these values start to increase quickly on the NFS server... may be 64bytes is the xfer size or something. May be those objects are not marked as unused and hence not cleared from cache... I dont know... just guessing...

Thanks again!
Raj

 
On Tue, 19 Apr 2005 normand wrote :
>Raj Kumar wrote:
>
>>Hi everone,
>>
>>cat /proc/slabinfo:
>>  size-64          4825410 4825410    128 160847 160847    1 : 1008  252
>>
>>This seems to be unusal... size-64 slab is consuming upto 643MB of RAM. This number seems to increase slowly... how to track which process is requesting the objects from this slab? Does anyone know if there is a bug related to this in RH 2.4.21-27.0.1.ELsmp kernel?
>>
>>Thank you,
>>Raj 
>
>Have you got really memory problems.
>Linux will use almost the maximum usable memory, but only to make it fastly available.
>
>What's the results of the command : free
>The memory will increase slowly after the boot, and then stay at a high level.
>
>But it's the normal behaviour.
>
>
>
>
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