[Spread-users] Slow receiver

Jonathan Stanton jonathan at cnds.jhu.edu
Mon Jan 26 23:53:55 EST 2004


I don't have quite enough information to know what is going on. Generally
the latency of a single message send in Spread should be quite low. On
modern machines, maybe in the neighborhood of a few hundred microseconds
of work plus scheduling delays (switching between client, daemon, back to
client if run on one machine) of anywhere from a few milliseconds to 30

Can you provide us with your spread.conf configuration and some more 
information about how much the receiver is lagging (what the delay is) and 
the rough computer power? How are you timing the send time vs receive 
time? Are they on different machines? 

One note, although it isn't necessarily affecting your results, 
on most OS's sleeping for 1ms actually sleeps for 10+ms since 10 ms is the 
minimum scheduling delay. 



On Mon, Jan 26, 2004 at 08:43:27PM -0800, Anurag Gupta wrote:
> Hi,
> I am seeing some unusual delays in getting spread to transfer messages. I
> have a simple flooder sleeping 1 millis after publishing each message
> (message size 100 bytes), and a receiver receiving those messages (no
> processing done). Receiver is lagging behind in receiving the messages quite
> a bit.
> How do I see where the delay is? Is this expected? Or a result of some
> misconfiguration?
> regards
> -anurag
> _______________________________________________
> Spread-users mailing list
> Spread-users at lists.spread.org
> http://lists.spread.org/mailman/listinfo/spread-users

Jonathan R. Stanton         jonathan at cs.jhu.edu
Dept. of Computer Science   
Johns Hopkins University    

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