[erlang-questions] Inter-node communication bottleneck

Jihyun Yu <>
Wed Aug 20 13:08:45 CEST 2014


Hi, Thanks for reply!

I just tried, but it seems that there is no signigicant difference
on performance. Here's script which used on benchmarking.

https://gist.github.com/yjh0502/68d6ffce93bcbc425435



On Wed, Aug 20, 2014 at 02:11:07PM +0400, Alexander Petrovsky wrote:
> Hello!
> 
> Have you tried to use:
> 
> #  erl ... inet_default_connect_options '[{delay_send, true}]'
>  inet_default_listen_options '[{delay_send, true}]'
> 
> ?
> 
> 
> 2014-08-19 16:59 GMT+04:00 Jihyun Yu <>:
> 
> > Hi,
> >
> > There is a prior discusson[1] about inter-node communication bottleneck,
> > and I experienced same issue on inter-node messaging. I dig into the
> > issue and it found that there is a lock on inter-node messaging[2] which
> > causes bottleneck on sending messages to single node. With simple
> > experiment, I found that there is a limitation on number of messages per
> > second, not bandwidth. 1Gbps link could be easily satuated by messaging
> > betweeen two erlang nodes if message size is large enough, e.g. 4KB
> > binary message. However if message is small, e.g. single integer term,
> > number of messages per seconds is limited about 200~300k/sec.
> >
> > Is there any effort to solve the problem? In fact the problem could be
> > solved by using external channel like multiple TCP connection pool for
> > rpc, but I believe using erlang messaging keeps code much simpler.
> > Actually for me the problem is quite embrassing, because I thought
> > scalable messaging is a key feature and strength of Erlang.
> >
> >
> > [1] http://erlang.org/pipermail/erlang-questions/2013-December/076232.html
> > [2]
> > https://github.com/erlang/otp/blob/OTP-17.1/erts/emulator/beam/dist.c#L1768-L1826
> > _______________________________________________
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> > 
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> >
> 
> 
> 
> -- 
> Петровский Александр / Alexander Petrovsky,
> 
> Skype: askjuise
> Phone: +7 914 8 820 815



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