Used memory in Java melody means what?

[Anu]

Hi Team,

I have been using the java memody for monitoring my Jenkins instance.  Could you please let me know exactly what parameter it consider for used memory.  If I check in linux server whatever value i'm getting is not matching with the graph value.  Please help me to understand and also using which command in my linux server I can get the exact value.

[evernat]

Hi Anu,

"Used memory" in javamelody is used memory in the heap.

It is different than allocated memory, which is sometimes different than max heap memory.

It is also different than non-heap memory.

And all these are different than RSS in Linux (lazy allocation, paging, ...)

There are books on this. But you can start with this small article by Yourkit:

https://www.yourkit.com/docs/kb/sizes.jsp

bye,

Emeric

[Anusha Hegde]

Thanks Emeric for you reply.  However I'm not getting the exact Java heap memory used.  I tried with command like jmap -heap pid and jstat. How do I validate whatever value is displayed in Java melody is correct.

Please help me here.

Regards,

Anusha

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[evernat]

Hi,

If you want to compare, you can do that by having a graph of heap memory for an hour, in jconsole or in jvisualvm for example.

bye,

Emeric

Le lundi 18 février 2019 10:42:27 UTC+1, Anu a écrit :

Thanks Emeric for you reply.  However I'm not getting the exact Java heap memory used.  I tried with command like jmap -heap pid and jstat. How do I validate whatever value is displayed in Java melody is correct.

Please help me here.

Regards,

Anusha

[Anusha Hegde]

Thank you Emeric

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