Re: Schedulers

[John Heidemann <johnh@isi.edu>]

On Fri, 26 Nov 1999 19:09:37 +0100, Guillermo Rodriguez Garcia wrote: 
>Hi all,
>
>I am doing several simulations for moderately large
>topologies (about 1000 nodes). Each of these nodes
>holds a client which produces about 10 requests per
>second. These requests travel to the server where
>they are serviced, and a 'response' packet is
>sent back for each request. The simulation runs
>for about one minute (simulation time). This means
>that a lot of packets are generated. Currently,
>each simulation lasts for about 6-7 hours (real
>time). I would like to reduce this time.
>
>I am using hierarchical routing but I cannot use
>SessionSim due to subtle details.
>
>Should I use a scheduler different than the
>'standard' one? Which are the differences between
>the list, heap and calendar schedulers?

The default scheduler (calendar) is quite fast.
(List is quite slow.)

Are your requests and responses going through Tcl?  You don't give
many details, but if each req/resp is just a couple of packets over
TCP, all driven from Tcl, that's a lot of language switching overhead.

   -John Heidemann