[erlang-questions] Why reductions of supervisor is heigh?

[Solomon]

I test web server build with OTP, and I found reductions of supervisor was much heigher then gen_server, what was supervisor doing?

[Roberto Aloi]

Hi,

> I test web server build with OTP, and I found reductions of supervisor was
> much heigher then gen_server, what was supervisor doing?

What kind of supervisor are we talking about? Does it have dynamic children?

In OTP you can have different kinds of "supervisor". Assume you use a
"simple_one_for_one" supervisor and you add children dynamically. In
such a case, you would perform a call (or even more than one) to the
supervisor process every time you append a child. That would affect
the reductions counter.

Roberto Aloi
@robertoaloi
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[Solomon]

Hi,
I generate the process like this code:

init([])->
  Children={my_server, {my_server, start_link, []}, permanent, 5000, worker, [my_server]},
  Processes=lists:flatten([Children]),
  Strategy={one_for_one, 100000, 1},
  {ok, {Strategy, lists:flatten(Processes)}}.

The supervisor should append the children at the beginning.

2012/9/17 Roberto Aloi <pro...@gmail.com>