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Re: Scalability of Netconf
On Mon, Jul 04, 2005 at 01:19:57PM -0400, Sharon Chisholm wrote:
> These would be interesting numbers to get. I've heard related (but
> opposite?) concerns around being able to get the most out of each
> netconf connection to ensure that more complex deployments don't max out
> on connections. This might eventually require us to continue the
> channelization discussions which was mainly deferred, but I think that
> can wait a bit. First step would be to determine if this is really an
> issue in practice.
I am not yet done with my experiments. So far, I have writen a script
which connects to ssh subsystems I called cat:
Subsystem cat /bin/cat
The script kicks off a standard ssh client to connect to a remote cat
subsystem and then starts a loop where it periodically sends a message
and checks whether that is echoed back correctly. Nothing fancy. (Note
that this script is rather heavy weight since it requires a new ssh
process for each connection - a more serious implementation would
require some C code so that you can keep multiple connections in one
process.)
I am running this script on a 3GHz Pentium with 512 MB Ram (so really
nothing high end for a management system) running Linux 2.6.10. I
keep 300 connections open and the funny thing is that this box does
not at really get stressed by this. The load never went above 0.1%
and was most of the time significantly below. The memory used excluding
buffers was ~235 MB.
Given that the script is really a crude resource hog, the box performed
much better than expected. The next step is probably to shoot for
1000 ssh connections with this crude script. I just have to setup
more cat subsystems to talk to...
/js
P.S. I admit that my Mac OS X notebook does not behave that friendly
since I was simply running out of slots in the process table. ;-)
P.S. Attached is the ugly quick and dirty script - I am sorry for
using Tcl and not Perl - I am sure Perl will make this faster. :-)
--
Juergen Schoenwaelder International University Bremen
<http://www.eecs.iu-bremen.de/> P.O. Box 750 561, 28725 Bremen, Germany
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