ESM High memory usage

[Former Member]

Hi we have an ESM running with a CPU load of 6% and several hundreds of events per second, but the memory usage is 90% of the available 64GB. Why is that so high?

[vsenthil]

Hello there,

Memory usage in ESM depends on the queries running, EPS,reports/watchlists running at that time. 

May I know about your ESM for detailed understanding ? Is that a Combo box along with receiver and ELM or a standalone ESM ? Also specify the model number of it. 

[lratcliffe]

In order to most effectively use the resources available to it, the ESM will use the majority of available RAM as disk cache - this improves performance and if the RAM is needed for another purpose, the disk cache can be discarded.

To verify if this is the case, please run the command:

free -m

on the back-end of your ESM appliance.  The output will be similar to this:

	total	used	free	shared	buffers	cached
Mem:	64253	54073	10179	0	532	28832
-/+ buffers/cache:		24708	39544
Swap:	4901	0	4901

The real free RAM value is the second one under free against the -/+ buffers/cache entry.

[Dor]

after i am running the free -m what is the next step to free the ram cache?