[linrad] Re: MAP65 and Linrad Network

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

Hi Leif,

> > Yes, it should be possible to run everything on a single 
> > fast computer with plenty of memory.  I have not yet 
> > established that the necessary CPU-sharing during 
> > time-critical parts of each program is handled adequately 
> > for this to work without glitches.  Neither Linrad nor 
> > Windows is a very good real-time O/S, and one must work 
> > around their limitations in this area.
>
> I do not think there would be any problems:-)

OK, I tried it with both programs running on the same 
(Linux) computer.  In this case the two programs were "plrs" 
(my "pseudo-Linrad send" program) and MAP65.  The Linux 
computer has two Xeon CPUs at 2.4 GHz, each with 512 kB L2 
cache, and 1 GB memory.

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.

Of course it should be possible to improve this situation; I 
have not yet tried to address it.  In the meantime, I shall 
continue to test with Linrad (or plrs) running on one 
computer, MAP65 on another.

	-- Joe, K1JT

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