What to monitor for memory usage?


 
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# 1  
Old 07-12-2011
What to monitor for memory usage?

hi guys

I am having a doubt about memory monitoring on linux system
what I should be monitoring? memory usage? o swap usage?

I am using some monitoring tools but I am confused to what monitor for alerting

for example this case
looks the memory usage is very high and it's like that all the time
so is it memory usage or swap usage? in case swap is the metric what should be threshold ?

Code:
Mem:   2738708k total,  2620784k used,   117924k free,   107872k buffers
Swap:  2104472k total,      240k used,  2104232k free,   837772k cached

thanks a lot guys
# 2  
Old 07-13-2011
I suggest using vmstat and monitoring the column called "so". Non-zero values would mean that the system is trying to make memory available.
# 3  
Old 07-14-2011
Most of the new linux people will have this confusion....

It is all nothing but caching... Help! Linux ate my RAM! ...
 
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