Re: How are 'PHYSICAL_MEMORY_BYTES' and 'VIRTUAL_MEMORY_BYTES' calculated?
They are the running metrics. While the task is running, they will tell you how much pmem/vmem it is using at that point of time. Obviously at the end of job, it will be the last snapshot. Thanks, +Vinod On Jul 12, 2013, at 6:47 AM, Shahab Yunus 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,
Re: How are 'PHYSICAL_MEMORY_BYTES' and 'VIRTUAL_MEMORY_BYTES' calculated?
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.comwrote: 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,
Re: How are 'PHYSICAL_MEMORY_BYTES' and 'VIRTUAL_MEMORY_BYTES' calculated?
As Vinod Kumar Vavilapalli they are indeed snapshots in point and time. So they are neither the peak usage from the whole duration of the job, nor cumulative aggregate that increases over time. Regards, Shahab On Fri, Jul 12, 2013 at 4:47 PM, hadoop qi hadoop@gmail.com 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.comwrote: 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,
Re: How are 'PHYSICAL_MEMORY_BYTES' and 'VIRTUAL_MEMORY_BYTES' calculated?
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,
How are 'PHYSICAL_MEMORY_BYTES' and 'VIRTUAL_MEMORY_BYTES' calculated?
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,
