FEAP User Forum

FEAP => Parallel FEAP => Topic started by: aleximos on September 06, 2012, 05:08:51 AM

Title: Metis partitioning
Post by: aleximos on September 06, 2012, 05:08:51 AM

I'm trying to figure which partitioning method Metis is using in Parfeap , node or element cut partitioning?  I was searching in the Metis manual but could't find  :-\

Title: Re: Metis partitioning
Post by: Prof. S. Govindjee on September 06, 2012, 09:14:45 AM

It is a partition of the node graph.  See parfeap/pmacr7.F.

Title: Re: Metis partitioning
Post by: aleximos on September 14, 2012, 05:53:52 PM

Thanks!
I would like to ask also something about ghost nodes. What's the difference in 2 domains between the ghost nodes and the shared nodes?

Title: Re: Metis partitioning
Post by: FEAP_Admin on September 16, 2012, 09:27:11 AM

In parFEAP the equations are owned by the different processes.  Thus if a procssor needs to assemble the equations for a node on the boundary between two domains it will need information from some of the nodes on the other processor -- these are the ghost nodes.  There is no sharing of nodes.  Nodes are either owned by one process or another.  The 'ghost' information is transmitted when needed between processes for the purpose of computing the RHS and the matrix elements.

Title: Re: Metis partitioning
Post by: aleximos on September 16, 2012, 09:32:26 AM

thanks again