[Avrora] Avrora does not run in Real-Time

Wed Feb 25 01:33:33 PST 2009

May be your serial monitor can be executed in a second computer and connected
via Ethernet by your simulator.

--marco.

> Hi Rodolfo,
>
> I couldn't solve the problem. Thus, I just try to upgrade the memory of
> my machine from 4GB to 8GB. I am ordering some memories from Amazon..
>
> But, my colleague found an interesting fact. When he ran a simple blink
> application on the motes on the Avorora, then the CPU usage went up to
> 100% with faster operation. But, if he ran some other apps that requires
> serial monitor, then the CPU went only up to 50~70% as what I got
> before. So, we are suspecting that serial monitor is one of the major
> cause of slowing down Avrora.
>
> But unfortunately, serial monitor is an essential block of our simulator
> to hook up with Avrora. So, now only thing that I can do is just to slow
> down my simulator so that it runs as slowly as Avrora does, that is,
> time synchronization. It is not the ultimate solution, but it somehow
> works in that way. :(
>
> If you have better ideas, then please let me know.
>
> Thanks,
> Paul
>
>
>
> rodolfo de paz wrote:
> > Hi Paul,
> >
> > Did you finally get any solution to improve Avrora performance?
> >
> > Thanks,
> >
> > Rodolfo.
> >
> > -----Original Message-----
> > From: avrora-bounces at lists.ucla.edu on behalf of Paul J. Shin
> > Sent: Wed 28/01/2009 6:30 AM
> > To: Zainul Charbiwala
> > Cc: Mailing list for Avrora simulator users and developers.
> > Subject: Re: [Avrora] Avrora does not run in Real-Time
> >
> >
> > Hi Zainul,
> >
> > I just tested my simulator again with 120 nodes on my machine.
> > All of the four cores run at averagely 50% rate (per core), and the
> > memory usage was 80% of total 4 GB.
> > It seems that insufficient memory may be one reason that slows down
> > Avrora. However, since it didn't go up to 100%, it may not be the main
> > reason. This is the biggest headache to me in these days.
> >
> > Is there anybody who can help me? Could you help me out, Ben?
> >
> > Thanks,
> > Paul
> >
> >
> >
> > Zainul Charbiwala wrote:
> >
> >> Hi Paul,
> >>
> >> I'm adding the thread back to the mailing list. I'm not sure how many
> >> users have actually gone to a 100 nodes but I do remember that Ben had
> >> tested Avrora on a beefy Sun machine with up to 1000 nodes (please
> >> correct me, Ben).
> >>
> >> As far as I know, Avrora's current design does not handle multiple
> >> CPUs or cores. The 20% utilization that you see might be because on
> >> your quad core, one core is doing all the heavy lifting. Try running
> >> top and then pressing '1' to get the per core CPU usage.
> >>
> >> Zainul.
> >>
> >>
> >> On Tue, Jan 27, 2009 at 4:43 PM, Paul J. Shin <paulshin at purdue.edu
> >> <mailto:paulshin at purdue.edu>> wrote:
> >>
> >>
> >>     Hi Zainul,
> >>
> >>     Thank you for your suggestion.
> >>     Right now my machine has 4GB of memory and the CPU is 3GHz
> >>     Quad-core. Do you think the reason is still on the memory? Do you
> >>     think it would get better if I increase the memory?
> >>
> >>     Thanks,
> >>     Paul
> >>
> >>
> >>
> >>
> >>     Zainul Charbiwala wrote:
> >>
> >>         Hi Paul,
> >>
> >>         With a 100 node simulation, your bottleneck is memory (or
> >>         memory bandwidth) and not CPU.
> >>
> >>         I would suggest that your external simulator slow itself down,
> >>         if you can't reduce the number of nodes.
> >>
> >>         Zainul.
> >>
> >>         On Tue, Jan 27, 2009 at 2:24 PM, Paul J. Shin
> >>         <paulshin at purdue.edu <mailto:paulshin at purdue.edu>
> >>         <mailto:paulshin at purdue.edu <mailto:paulshin at purdue.edu>>> wrote:
> >>
> >>
> >>
> >>         Hi,
> >>
> >>         I got a weired case when I run Avrora.
> >>
> >>         It makes sense that Avrora does not run in real-time if my
> >>         machine is
> >>         not fast enough so the CPU rate goes upto 100% when I run Avrora.
> >>         But, for me it doesn't make sense that Avrora does not run in
> >>         real-time
> >>         with 20% of CPU occupancy. It always happens regardless of whether
> >>         I put
> >>         -real-time flag or not.
> >>
> >>         Why I say that Avrora does not run in real-time is because
> >>         although I
> >>         have run Avrora for about 2 hours, the elapsed time in Avrora
> >>         is only
> >>         about 5 minutes with 100 nodes.
> >>
> >>         I have made some other simulator that communicate with Avrora
> >>         through
> >>         serial ports using TCP communication. But, due to the time
> >>         discrepancy
> >>         between Avrora and PC-clock, I cannot perform any real-time
> >>         simulation.
> >>
> >>         Could you guys let me know why it is and how to solve it?
> >>
> >>         Thanks,
> >>         Paul
> >>
> >>
> >>         _______________________________________________
> >>         Avrora mailing list
> >>         Avrora at lists.ucla.edu <mailto:Avrora at lists.ucla.edu>
> >>         <mailto:Avrora at lists.ucla.edu <mailto:Avrora at lists.ucla.edu>>
> >>
> >>         http://lists.ucla.edu/cgi-bin/mailman/listinfo/avrora
> >>
> >>
> >>
> >>     --
> >>     ==================================
> >>     Paul J. Shin (Joonhwa Shin)
> >>     Graduate Research Assistant
> >>     Robot Vision Lab
> >>     School of Electrical and Computer Engineering
> >>     Purdue University
> >>     "Those who are wise will shine like the brightness of the heavens,
> >>     and those who lead many to righteousness like the stars for ever
> >>     and ever." - DAN 12:3
> >>     ==============================================
> >>
> >>     ?
> >>
> >>     ?
> >>
> >>
> >>
> >
> >
>
> ã€€
>
> ã€€
>
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