AW: [ejabberd] ejabberd vs Jabber XCP

Pieter Rautenbach Pieter.Rautenbach at
Fri May 5 16:44:41 MSD 2006

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Yes, under ideal conditions. I've done similar tests, but to simulate user
behaviour for a production system is a difficult task -- one simply doesn't
achieve the same performance as under testing. Not in our case, anyway...

-----Original Message-----
From: ejabberd-bounces at [mailto:ejabberd-bounces at] On Behalf
Of Staudinger, Ulrich
Sent: 05 May 2006 02:12 PM
To: ejabberd at
Subject: AW: AW: [ejabberd] ejabberd vs Jabber XCP

In my tests I came to a different memory consumption.

That's the memory chart, ramp up time of 20 minutes, staying there for another
20 minutes. 

Left is memory in MB, right number of conc. Users. 


-----Ursprüngliche Nachricht-----
Von: ejabberd-bounces at [mailto:ejabberd-bounces at] Im Auftrag
von Joel Reymont
Gesendet: Freitag, 5. Mai 2006 13:34
An: ejabberd at
Betreff: Re: AW: [ejabberd] ejabberd vs Jabber XCP

On May 5, 2006, at 12:21 PM, Pieter Rautenbach wrote:

> It's indeed a 64-bit server. I understand the reasoning, but I
> disagree: not all
> ejabberd data in memory could be strings! Thus, the memory usage 
> cannot be entirely attributed to the use of strings. Here are similar 
> figures for a single CPU server, having 14,065 users online:
> ejabberd 16   0 4778m 3.7g 1692 R 23.3 95.8 63:00.41  beam

I never meant to imply that all the memory is taken by user contexts, i.e. data
kept per user.  All I'm saying is that ejabberd, Mnesia, etc. use strings
internally and most everywhere it appears.

You should still see 1-2Gb of memory use on a 32-bit machine and a 64- bit
machine probably does not gain you much right now. As soon as string use within
ejabberd is optimized (Summer of Code project?) you should be able to fit twice
as many users on your 64-bit server. I don't think a factor of 16 (1 byte vs 16
right now) is likely, though.



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