If you are just trying to plot the nodes, I'd look no further than Graphviz. It even has a Perl module. In that case you don't need all the nodes in memory. Parse your input files and transform them line by line into a large dot file. Of coure GraphViz also takes edge weights into account.

In reply to Re: Managing a graph with large number of nodes by NiJo
in thread Managing a graph with large number of nodes by nishant2984

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