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From hadoop qi <hadoop....@gmail.com>
Subject Re: How are 'PHYSICAL_MEMORY_BYTES' and 'VIRTUAL_MEMORY_BYTES' calculated?
Date Fri, 12 Jul 2013 20:47:55 GMT
Thanks for the response. So they represent the total physical memory
(virtual memory) has been allocated to the job (e.g., from heap and stack)
during its entire life time? I am still confused how to get the cumulative
number from /proc/meminfo. I think from /proc/meminfo we can only get the
memory usage of a  process in a particular time point (looked like a
snapshot of the status of the process). If these numbers are added, the sum
would be much more than memory allocated to the program.


On Fri, Jul 12, 2013 at 6:47 AM, Shahab Yunus <shahab.yunus@gmail.com>wrote:

> I think they are cumulative but per task.
>
> Physical memory bytes
> (PHYSICAL_MEMORY_BYTES)
> The physical memory being used by a task in bytes, as reported by
> /proc/meminfo.
> Virtual memory bytes
> (VIRTUAL_MEMORY_BYTES)
> The virtual memory being used by a task in bytes, as reported by
> /proc/meminfo.
>
> This is from the Definitive Guide book. Page 260.
>
> Regards,
> Shhab
>
>
> On Thu, Jul 11, 2013 at 12:47 PM, hadoop qi <hadoop.jqi@gmail.com> wrote:
>
>> Hello,
>>
>> I am wondering how memory counters  'PHYSICAL_MEMORY_BYTES'  and
>> 'VIRTUAL_MEMORY_BYTES'  are calculated? They are peaks of memory usage or
>> cumulative usage?
>>
>> Thanks for help,
>>
>
>

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