Re: [Discuss-gnuradio] oprofile inband code results

[George Nychis]

Johnathan Corgan wrote:
> George Nychis wrote:
>
> > So it looks like there is a lot of time spent scheduling the threads in
> > the kernel.  We're not concerned about optimizing the application itself.
>
> Not really.
>
> Look at just the functions that take up more than 1% of CPU time (the
> bottom 21 lines.)  These total about 70% of the overall time spent.  Of
> these (approximate numbers)
>
> 26% libm, libc or libstdc++
> 19% libpmt
> 12% test_usrp_inband_tx
>  5% libusrp-inband
>  5% vmlinux or usbcore
>  3% libmblock
>
> So it doesn't appear whatever performance issue you are seeing is
> directly related to CPU time spent in the kernel.  I have some other
> ideas for profiling but don't have the time until later today perhaps to
> email to you.

Ah, you're right.  From what I can remember, it is spending 
significantly less time in the kernel compared to the last time we 
profiled it in June.  I'm going to do a couple more runs on some of the 
other inband applications also and see what happens.

Thanks!
George