[erlang-questions] Inter nodes messaging bottleneck

Sergej Jurecko sergej.jurecko@REDACTED
Tue Dec 10 16:29:24 CET 2013

Why don't you use a public ets table for counting? The number of messages being sent to a process should always be controlled in some way. 


On Dec 10, 2013, at 4:09 PM, Eli Cohen wrote:

> Hello,
> I'm facing a bottleneck issue between two nodes.
> I have several nodes in my cluster, each on different machine.
> Physical interface between the machines is 10G.
> On one node I have about 100 processes receiving packets from UDP sockets (~200 sockets) and banging Erlang messages towards a registered process located on remote node (also remote machine).
> In the reduced scenario the receiving process is a gen_server which does nothing with the messages - just counts the received messages (internal state counter, not a DB).
> By checking this internal counter I can say that maximum rx rate of this process stands on ~150K messages per second and there is no messages waiting in its queue. 
> Increasing the transmitting node feed does not affect this number and finally the transmitting processes queues start to grow. 
> Just to clarify that these 150K messages are about 120Mbps (over 10G line). Actually I expected to see about 1M.
> When I'm running these both nodes on same machine - the maximum received messages rate grows to ~400K per second.
> I've tried to set port parallelism (+spp) flag, increase distribution buffer busy limit (+zdbbl), set kernel poll (+K) - no significant difference. 
> Currently my conclusion is that the bottleneck is somewhere on transmit between nodes.
> Is there any flags/parameters that may affect this area?
> Any ideas, comments, help are more than welcomed :-)
> Thanks,
> Eli
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