[erlang-questions] gen_tcp:connect taking 3 seconds under load

[Bob Ippolito]

Are you testing on Mac OS X? I think this is a bug in the Mac OS X
kernel. I've seen behavior like this before only on Mac OS X and it's
reproducible with other environments, not just Erlang.

On Thu, Apr 15, 2010 at 5:56 PM, Jacob Vorreuter
<jacob.vorreuter@REDACTED> wrote:
> Hi,
>
> I'm load testing an Erlang proxy server that accepts incoming client connections and proxies data to backend server sockets.  Normally, the call to gen_tcp:connect to open the backend socket takes under 3 milliseconds.  However, under heavy load this call sometimes takes 3 seconds.  The strange thing is that it rarely takes any amount of time in the middle of that range.  It's either 3 milliseconds or 3000.  This is the call I'm making:
>
> gen_tcp:connect(Ip, Port, [binary, {packet, 0}]).
>
> Has anyone seen this behavior before?  I'm load testing with ab, making anywhere from 64 to 1000 concurrent requests.
>
> Thanks,
>
> Jake
> ________________________________________________________________
> erlang-questions (at) erlang.org mailing list.
> See http://www.erlang.org/faq.html
> To unsubscribe; mailto:erlang-questions-unsubscribe@REDACTED
>
>