[Tsung] Generating over 32k clients from a single machine

[Jason Tucker]

I've been able to generate close to 200K concurrent connections from a
single Solaris 10 box (using multiple IP addresses to get around TCP port
limitations). In addition to ports, make sure your system has enough
available filehandles as well.

Actually, the multiple IP solution might be something to try, if you haven't
already. You should be able to configure multiple "secondary" IP addresses
to your box and then spread your client processes across them. If for some
reason you are hitting a hard limit of ~32K per IP, using multiple IPs might
get you around it.

You are using SMP erlang, yes?

__Jason

On Feb 19, 2008 7:34 AM, Vinod Panicker <vinod.p at gmail.com> wrote:

> Hi,
>
> I'm trying to generate lots of xmpp clients from a single powerful
> machine and tsung is having problems when the load reaches to around
> 32k. In the log file, I see -
>
> =INFO REPORT==== 19-Feb-2008::17:58:34 ===
>         ts_launcher:(4:<0.47.0>) Phase duration exceeded, more than
> 20% (33.4%) of users were not launched in time (16708 users), tsung
> may be overloaded !
>
> The machine config is quite good and the cpu utilization is around
> 25%, no wait times etc.  It seems like the client machine is not able
> to use more than 32k ports, but I've already changed sysctl options to
> use a port range from 1024 through 65000
>
> Any clues as to what can be done?
>
> Regards,
> Vinod.
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