[JDEV] Max number of users....revisted!

[Jeremey Zela]

The first limiting factor is the one you've tried to compensate for, which is that "select" is limited to FD_SETSIZE.  Have you recompiled the jabberd source since the kernel tweaking? Also, another problem you might face is with the maximum number of open file descriptors any process can have at a given time (defaulted to 1024, varies by the OS). You can look into using ulimit to raise this threshold (ulimit -n 65536).

That being said, instead of tweaking jabberd, you should take a look at the dpsm and jpolld daemons.  They both offer ways to distribute the socket connection bottleneck.  Basically, their only purpose is to manage client connections and funnel information to and from the main jabberd (via a single master connection to the server).  The other advantage of these is that they both use "poll" to manage the I/O notifications instead of "select".  Poll does not suffer from the FD_SETSIZE limitation, so the kernel tweaking isn't necessary (although, the ulimit tweak is still needed).

Anyway, I hope that helps.  Your results may vary.

Jeremey Zela
Northridge Systems, Inc.


-----Original Message-----
From: Riyaad Miller [mailto:RMiller at mweb.com] 
Sent: Friday, March 15, 2002 9:46 AM
To: Jabber Administration (E-mail); Jabber Developers (E-mail)
Subject: [JDEV] Max number of users....revisted!

Hi all

Small question ... 
What is the limiting factor on the number of simultaneous connections to jabberd?
I'm currently using jabber 1.4.1 open source. It cries at 1000 (about) despite tweaking mgy kernel to get beyond 60000 fd's.
Are there any thread number issues involved? Could I run multiple jabberd processes on different ports to get a higher total number of connections to my server?

Thanks ....
Regards RM

 
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