Re: Need to simulate 1000 - 5000 clients using polygraph 2.5.4 using Solaris

On Mon, 27 Nov 2000, Monte Turner wrote:

> We are using polygraph 2.5.4 and running Solaris 2.7. We need
> to simulate 1000 clients and are having trouble figuring it
> out. We have polygraph running fine with one client and one server,
> but need to simulate more. How do we do this?

You have several options. The recommended way is to create IP aliases
for each simulated Robot. See PolyMix-3 instructions, for example:
	http://www.measurement-factory.com/docs/PolyMix-3/ 

Last time I checked, the aka tool for creating aliases was working on
Solaris. I no longer have access to a Solaris box, so I cannot double
check for you.

A possible alternative is to "clone" robots. 

See
 http://polygraph.ircache.net/cgi-bin/mail2html.cgi?fnames=20000601/707
 http://polygraph.ircache.net/cgi-bin/mail2html.cgi?fnames=19991101/388
 http://www.measurement-factory.com/docs/FAQ/FAQ-3.html#ss3.4
for more info.	


Adding robots without adding more hosts increases CPU and RAM
requirements for a host. Be careful not to create a bottleneck by
using too many robots on s single host. With PolyMix-2,3, we use 1000
robots per host. Using 5000 robots with default request rates will
require Gigabit NICs and powerful CPU/RAM configuration.

For servers, you can use IP aliases or different ports. The former is
recommended. For the latter, Polygraph 2.6 will support port ranges;
with 2.5 you have to list all IP addresses in your PGL file, varying
the port number. You cannot clone servers without adjusting the
addresses because a server needs a unique address to listen on.

HTH,

Alex.

P.S. Stock Solaris configuration may not be able to support many
robots efficiently. See what we have to do to tune FreeBSD and try to
mimic those changes on Solaris:	http://polygraph.ircache.net/Tips/
IIRC, mailing list archive has some Solaris-specific tips.