perfSONAR User Q&A and Other Discussion

[Mark Foster <>]

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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