Re: oprofile counter definitions

[Maynard J. <may...@us...>]

On 08/12/2013 04:06 PM, Keith Spinney (kspinney) wrote:
> Hi –
> 
>  
> 
> I am running oprofile version 0.9.7, and would like to know if the counters from /var/lib/oprofile/samples/oprofiled.log are documented anywhere?  Specifically, I am interested these global counters:

Keith,
There's some discussion of these stats in a recent IBM article I wrote (publicly accessible) at:
http://pic.dhe.ibm.com/infocenter/lnxinfo/v3r0m0/index.jsp?topic=%2Fliacf%2Foprofgetstart.htm

The above article was based on a more in-depth article I had written a 2 or 3 years ago, and there's a link to that old article at the bottom of the page. Unfortunately, the link is broken.  I'll see if I can resurrect that old (more complete) article, but the above URL should give you some good tips.

BTW, 0.9.7 is 2 years old, and there have been a number of great enhancements that you could benefit from, including better handling/notification of lost samples. I highly recommend 0.9.9.

-Maynard
> 
>  
> 
> -- OProfile Statistics --
> 
> Nr. event lost due to buffer overflow: 0
> 
> Nr. samples lost due to no mapping: 3
> 
> Nr. backtraces skipped due to no file mapping: 99912
> 
> Nr. samples lost due to no mm: 0
> 
>  
> 
> I understand that reducing the sampling rate will make most of these counters go away, but the counter I am most interested in is “Nr. backtraces skipped due to no file mapping” because it increases monotonically between oprofile runs - it does not clear each run like the other counters.  Only `opcontrol –deinit` clears it.  Is this expected for this counter or is it a bug?
> 
>  
> 
> Thanks for your help!
> 
> -        Keith
> 
>  
> 
> 
> 
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