mosquitto-users team mailing list archive

["Frisch, Michael" <Michael.Frisch@xxxxxxxxxx>]

My test involved 200k clients subscribed to 1 of 10 topics and publishing on the random interval of 0 to 1800 seconds to one of the 10 topics.  Everything was done at QoS 2, SSL off.

An easy workaround that we've taken is to encrypt the payload over the non-secure connection.  The burden is then placed on the message producing/consuming software but that's something that just has to be dealt with when maintaining so many open connections.

- Mike

-----Original Message-----
From: mosquitto-users-bounces+michael.frisch=nuance.com@xxxxxxxxxxxxxxxxxxx [mailto:mosquitto-users-bounces+michael.frisch=nuance.com@xxxxxxxxxxxxxxxxxxx] On Behalf Of Roger Light
Sent: Wednesday, November 14, 2012 12:36 PM
To: mosquitto-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Mosquitto-users] Build up a MQTT server with about 20, 000+ subscribers

Hi Mike,

> -        There’s not much special, EC2 mediums can do 200k+ (yes, two
> hundred) with QoS 2, SSL off, and a moderate number of messages 
> publishing constantly.

Can you offer any further details on what "moderate" means here? Just a rough order of magnitude would be nice to know.

> Sharon, the problem that I can already tell you that will arise with 
> SSL is memory usage.  I forget the exact numbers but calling the 
> consumption noticeable would be an understatement.  With SSL off 
> Mosquitto uses such a small amount of RAM which is why EC2 high CPU mediums are perfect.

Yes... It would be nice to try something less heavyweight than openssl, but the nice obvious alternatives like cyassl are gpl/commercial licensed.

Cheers,

Roger

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