[erlang-questions] Terminate process if it is slow at receiving messages

Michael Loftis mloftis@REDACTED
Fri Sep 20 18:31:11 CEST 2013

Pretty simple actually...send them a message, perhaps with a timestamp
(os:timestamp()) - the expectation is that the process responds back.
If it does not at all within your window, kill it.  If it does, but is
unacceptably slow, kill it.

Not at all difficult.

On Fri, Sep 20, 2013 at 8:08 AM, akonsu <akonsu@REDACTED> wrote:
> Hello,
> I have posted this question to stackoverflow
> (http://stackoverflow.com/questions/18895614/terminate-process-if-it-is-slow-at-receiving-messages)
> and received one helpful response, but I am still not clear about the right
> way to do it.
>  I also have seen this thread:
> http://erlang.org/pipermail/erlang-questions/2011-June/059335.html, which is
> somewhat similar but it still did not hep me.
> I would appreciate more help. Here is the question:
> I have a data source process that sends messages to worker processes. To
> keep memory consumption under control, I need to terminate the workers that
> are slow retrieving their messages from their mailboxes.
> I am new to Erlang, I would appreciate any pointers. If this is difficult to
> accomplish with Erlang messages, maybe I can use sockets? If so, are there
> examples?
> I have a registered process that reads from the web and generates a lot of
> data. It sends these data to all the "subscribed" processes using Erlang
> messages. For each particular piece of data, it sends the same message to
> all subscribers.
> I also have a web server that streams the data that the registered process
> reads. So, when a http client connects, the web server creates a process and
> this process subscribes to the registered process and starts receiving its
> messages.
> The registered process uses monitors to monitor subscribers. The subscribers
> are controlled by the web server, and when a connection is closed, the
> process that were serving this connection, dies.
> There is no acknowledgement, that is, subscribers do not respond when a
> message is sent to them. Although I can program them this way, but I think
> it is too much traffic.
> Basically I want to close the connection if a http client is too slow.
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