SYNC vs ASYNC calls

Gaspar Chilingarov <>
Tue Jul 19 16:24:15 CEST 2005


Ulf Wiger wrote:

> 
> I changed one line of code in tickplus.erl and added three
> to tickdb.erl, and now the program seems to be flying along:
> 
> What I did: changed the gen_server:cast(DB, {'ADD'...}) to
> a gen_server:call().
> 

I would like to suggest put this example somewhere into documentation or
efficiency guide -- i'd also hit the same problem in my program - i've
asked mailing list about poor performance of parses -- somthing like 400
comma separated lines/second. Later I've found that I hit erlang's
limits of message queue creation speed. changing call from async to
synchronous also bumped parse speed about 10 times.

I guess this is a standard error, which novices(and not so novices ;)))
  can do, thinking that passing confirmation message back to caller for
each parsed line it too much overhead -- thus writing programs which
flood worker process queue with messages.

-- 
Gaspar Chilingarov
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