[linrad] Re: MAP65 and Linrad Network

[Joe Taylor <Princeton.EDU; joe@xxxxxxxxxxxxxxxx>]

Hi Leif,

> > The combination works OK, and but a significant number of 
> > packets (around 400 in each minute, or slightly more than 1% 
> > of the data) are dropped during MAP65's most 
> > compute-intensive parts of each minute.  Since plrs does no 
> > significant computing, I imagine that the problem may be 
> > worse when running Linrad + MAP65.
>
> It could also be the other way around.....

Indeed, it could.  In that case I will be surprised, but it will 
hardly be the first time I have been similarly surprised.

> It may be necessary to add a call to Sleep(0) under Windows
> or to sched_yield() under Linux at regular intervals in all
> routines that might lock up the CPU for a too long time.
>
> Those calls are effected by lir_sched_yield() in the OS independent
> code of Linrad and I found it necessary to place about 45 such
> calls within Linrad.

Hmmm, I may have trouble doing the equivalent.  For example, 
MAP65 does some very long FFTs using tthe FFFTW3 library.  I 
can't very well put calls to relinquish CPU control inside these 
tasks.  On the other hand, there is a "threads" version of 
FFTW3, which might be what's needed.

Right now such issues are not a top priority, though.

	-- Joe, K1JT

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