Re: How to generate the report from the profiled data at regular intervals

[William C. <wc...@re...>]

manyam nirupa wrote:
> Hi
>  
> I need to plot a graph with time on x-axis with regular intervals and % 
> CPU used per process  on y-axis. So i wanted to know if there is any 
> option to poll the oprofiler report at regular intervals or not. If yes, 
> please let me know the way. If not, kindly let me know, if there are any 
> tool which supports that.
>                                                                        
> Regards,
>                                                                        
> Nirupa.

Hi Nirupa,

Couldn't you read this infomation from /proc/[number]/stat (where number 
is the process id)? This might not be entirely accurate. The process may 
not use the entire jiffy (e.g. interrupts or yield the process)

You might be able to use perfmon2 to collect data. There is an 
experimental patch for the 2.6 kernel to provide perfmon2 for x86 
processors. Have one process read the counters on the process being 
monitored. There are some examples in the libpfm library that might be 
close to what you want, but I don't think they deal with monitoring 
multiple processes. On most modern processors you can count processor 
cycles on a process. However, newer processors can change the clock 
frequency, and this might make it difficult to be sure about the amount 
of time that the process used because the clock ticks are not all the 
same amount of time. Below are some pointers to perfmon2.

http://sourceforge.net/projects/perfmon2

http://www.hpl.hp.com/techreports/2004/HPL-2004-200R1.pdf


-Will

> 
> */John Levon <le...@mo...>/* wrote:
> 
>     On Fri, Nov 04, 2005 at 12:27:29PM +0000, manyam nirupa wrote:
> 
>      > I'm running oprofiler-0.9.1 for fedora 2.6 kernel using TIMER mode
>      >
>      > I'm using 'opcontrol ---dump and opreport to get the report out
>     of the
>      > samples collected. I need to generate this report for every 10
>      > milliseconds.
> 
>     Why?
> 
>      > Kindly suggest me how can I get the report for every 10 ms from the
>      > samples collected.
> 
>     There's no way.
> 
>     john
> 
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