perfSONAR User Q&A and Other Discussion

[Azher Mughal <>]

Thanks Mark. This is helpful.
-Azher

On 2/3/2015 10:24 AM, Mark Foster wrote:
> When you want to monitor a specified process and assigned core, you
> can also use pidstat:
>
> pidstat -u -p 30 4
>
> shows the cpu used by process id# 30 on 4 second intervals.
> Note the process id can be a list X,Y,Z
>
> I've found this useful when, e.g., I'm running nuttcp, where I've used
> the process affinity option to bind the process to a core.
>
> -- Mark
>
> On 2/3/2015 9:46 AM, Azher Mughal wrote:
>> Ah ... "f" option for top is useful. Next option is 'j' which adds a
>> P column for the SMP core.
>>
>> Thanks
>> -Azher
>>
>> On 2/3/2015 9:42 AM, Tom Throckmorton wrote:
>>> On Tue, Feb 3, 2015 at 11:14 AM, Azher Mughal 
>>> <
>>> <mailto:>>
>>>  wrote:
>>>
>>>     Hi All,
>>>
>>>     I thought you might have some better hints.
>>>
>>>     As you know that running processes can be mapped to different
>>> CPU cores
>>>     (irqbalance or manual). By default process affinity is f or ff etc.
>>>     based on the number of available cores.
>>>
>>>     Is there a way (other than taskset or poking /proc) to see which
>>> process
>>>     is using which core , I mean through some some Linux tool ? I tried
>>>     htop, top, atop, mpstat ... but they tell a summary of total
>>> core usage,
>>>     but not about that specific process which just consumed 40% of
>>> that core.
>>>
>>>
>>> Couple of ways:
>>>
>>> 1) ps -F wlll show the PSR,  which is the processor that process is
>>> currently assigned to
>>>
>>> 2) recent top version can be taught to show it (in top, f to select
>>> fields mgmt, then select P)
>>>
>>> I believe htop can as well, but don't have that installed at the
>>> moment, and can't recall the invocation.
>>>
>>> cheers,
>>>
>>> -tt
>>>
>>>
>>>     An alternate way could be to get a process list and force
>>> taskset the
>>>     interested ones.
>>>
>>>     Thanks
>>>     -Azher
>>>
>>>
>>>
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>>
>