How to manage very large networks

[alespit]

I address my question to you that have a deeper knowledge and experience.
I have modeled a very large network 1,000,000 of nodes, however when I build the network it takes a lot of time to add all the nodes, how is it possible?
Do you have any suggestion to solve it (algorithm, target...)? In terms of time, how does it take? Is there any chance to parallelize (GPUs or OpenMPI) the computation?
Thanks in advance

[shooltz[BayesFusion]]

I have modeled a very large network 1,000,000 of nodes

One million nodes is probably not feasible with SMILE. Did you actually create the SMILE (or jSMILE) network containing that many nodes?