Thank you harsh.  Can you please explain what you mean when u said "Just
simple virtual memory used by the process" ?  Doesn't virtual memory means
swap?

On Wednesday, March 25, 2015, Harsh J <ha...@cloudera.com> wrote:

> The suggestion (regarding swappiness) is not for disabling swap as much as
> it is to 'not using swap (until really necessary)'. When you run a constant
> memory-consuming service such as HBase you'd ideally want the RAM to serve
> up as much as it can, which setting that swappiness value helps do (the OS
> otherwise begins swapping way before its available physical RAM is nearing
> full state).
>
> The vmem-pmem ratio is something entirely else. The vmem of a process does
> not mean swap space usage, just simple virtual memory used by the . I'd
> recommend disabling YARN's vmem checks on today's OSes (but keep pmem
> checks on). You can read some more on this at
> http://www.quora.com/Why-do-some-applications-use-significantly-more-virtual-memory-on-RHEL-6-compared-to-RHEL-5
>
> On Thu, Mar 26, 2015 at 3:37 AM, Abdul I Mohammed <oracle.bl...@gmail.com
> <javascript:_e(%7B%7D,'cvml','oracle.bl...@gmail.com');>> wrote:
>
>> Thanks Mith...any idea about Yarn.nodemanager.Vmem-pmem-ratio parameter...
>>
>> If data nodes does not require swap then what about the above parameter?
>> What is that used for in yarn?
>
>
>
>
> --
> Harsh J
>

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