<div dir="ltr"><div>The other day I was wondering the same and I randomly changed the defaults to this: {20000, 50} and it hurt performance badly, at least for the very simple test I was running of "push as many small messages as possible". </div>
<div><br></div><div>-Alvaro</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Sep 16, 2013 at 9:56 AM, Simon MacMullen <span dir="ltr"><<a href="mailto:simon@rabbitmq.com" target="_blank">simon@rabbitmq.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On 15/09/13 11:05, Bruce Dou wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Any one changes -define(DEFAULT_CREDIT, {200, 50}). ?<br>
It seems the throughput changes when I modify these 2 param.<br>
</blockquote>
<br></div>
Does it change for the better or the worse? What change did you make?<br>
<br>
When we developed the flow control feature we considered making this tunable, but there seemed to be a fairly broad plateau for the initial credit values with broadly similar performance, so we just picked values in the middle of that range and stuck with it. If you have a scenario where tuning this value does something useful I'd like to hear about it...<br>
<br>
Cheers, Simon<span class="HOEnZb"><font color="#888888"><br>
<br>
-- <br>
Simon MacMullen<br>
RabbitMQ, Pivotal<br>
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