Multicast speeds



  • 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



  • 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.



  • 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.


  • Moderator

    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?



  • 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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