Simultaneous invocations of nmap

[Rick Rineholt <cr22rc () gmail com>]

Hi
Has anyone done any performance studies on invoking simultaneous 
instances of nmap on the same machine each covering separate subnets 
versus executing a single instance specifying all the subnets?  One 
reason I ask is I thought I read some info that nmap has some built in 
mechanism to throttle back sending out explanatory packets if it starts 
losing too many and surely having more than one instance at a time 
running I would think would interfere with that mechanism. 
Are there any guide lines available to help performance of discoveries 
on very large networks?
Thanks

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