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Multicast speeds

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  • J
    Jezzer
    last edited by May 16, 2013, 1:10 PM

    hi
    I have a virtual fog server sat on a desktop machine and want to be able to multicast at gigabit speeds for each machine? At the minute I have a couple of very basic gig 4 port switches and when 3 are fogging at once they take about an hour each…but on their own about 8 mins!! Is there a way to make all the machines fog at 8 mins per machine even using multicast? Do I need a special switch or something? tahnks

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    • C
      ChrisG
      last edited by May 16, 2013, 1:14 PM

      I know this topic isn’t quite what you are looking for but it does explain alot about how fog works and what slows down the process. [url]http://fogproject.org/forum/threads/specs.3918/[/url]

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      • C
        chad-bisd Moderator
        last edited by May 17, 2013, 2:28 AM

        Is your switch managed or unmanaged? Multicast slows down because it waits on all clients to respond before it can move on to the next batch of data. I’m not a multicast expert, but it’s the slowest client determines the speed. Usually I would say check the networking driver on the client, but since they unicast in 8 mins, I think the driver is OK.

        Can you give the HW specs of your server, specifically the RAM and CPU?


        If you would like to make a donation to the Fog project, please do so [U][COLOR=#0000ff][URL='http://sourceforge.net/dona…

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        • R
          Raff
          last edited by May 17, 2013, 9:04 AM

          With Multicast all the processing is happening at the server e.g uncompressing the image. Someone once did a guide on how to modify this so that the uncompressing of the image is handled by the client on Multicast, I think he also modified it to use pigz rather than gzip to take advantage of multicore processors on client. We couldn’t get it work properly on our network.

          I think that post might be on the old forum.

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          • G
            GBison
            last edited by Nov 14, 2013, 4:20 PM

            Here is the thread mentioned by Raff:

            [url]http://fogproject.org/forum/threads/minor-change-great-improvment-multicast-i-love-you.8005/[/url]

            We haven’t tried it at our place yet, but the theory of it makes sense.

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