Is the input format for ParMETIS different from that for Metis?

Hi,

Is the input format for ParMETIS different from that for Metis? If so, what is the right input format for ParMETIS? The example graph in the Graphs directory of the ParMetis distribution seems to have the same format as that accepted by (serial) Metis. However, when I try to run ParMetis on my own graphs, I get errors. (Serial Metis runs just fine on these graphs and graphchk (provided in Metis) says these graphs are ok too.) Specifically, the BSearch function invocation on line 432 in Mc_Global_CreateCoarseGraph raises "key not found" errors.

Much appreciate any help!

Thanks,
Venu Satuluri