No, every so often, 3 seconds IIRC, it capture pmem and vmem which corresponds to the usage of the process and its children at *that* specific point of time. Cumulative = cumulative across the process and its children.
Thanks, +Vinod On Jul 12, 2013, at 1:47 PM, hadoop qi wrote: > 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.yu...@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....@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, > >
