hwo to Running Formality Using Multiple CPUs on one server

I want to run fm_shell using multi cpus in one servel (not multi sevel) but it seems not work.

Hostname: RHEL37 (amd64)
Current time: Thu Sep 17 11:32:11 2009

Loading db file '/tool/synopsys/fm_2007.06_SP3/libraries/syn/gtech.db'
fm_shell (setup)> add_distributed_processors rhel37*4
Status: Forking successful
Stdout: **<<EMPTY>>**
Stderr: RHEL37: Connection refused

Warning: Failure while adding server <rhel37>. (FM-383)
Status: Forking successful
Stdout: **<<EMPTY>>**
Stderr: RHEL37: Connection refused

Warning: Failure while adding server <rhel37>. (FM-383)
Status: Forking successful
Stdout: **<<EMPTY>>**
Stderr: RHEL37: Connection refused

Warning: Failure while adding server <rhel37>. (FM-383)
Status: Forking successful
Stdout: **<<EMPTY>>**
Stderr: RHEL37: Connection refused

Warning: Failure while adding server <rhel37>. (FM-383)
0

what's the right way for this? thanks for your reply

This is a old question, but for reference of others
use the following option

set_host_options -max_cores <no of cpus>