[Trilinos-Users] Parallel Performance and non-continuous block layout

[Williams, Alan B]

Scot,

Yes you can call GlobalAssemble, then do calculations for interior data, then call FillComplete.
GlobalAssemble has a bool argument which allows you to specify whether it should internally call FillComplete. If you want to wait and call FillComplete later, specify that argument as false when you call GlobalAssemble.

Alan

> -----Original Message-----
> From: trilinos-users-bounces at software.sandia.gov [mailto:trilinos-
> users-bounces at software.sandia.gov] On Behalf Of M. Scot Breitenfeld
> Sent: Monday, October 04, 2010 10:30 AM
> To: trilinos-users at software.sandia.gov
> Subject: [Trilinos-Users] Parallel Performance and non-continuous block
> layout
> 
>   Does it effect the parallel performance to have non-continuous nodal
> global ordering? For example, in 1D if I have (2 procs),
> 
> 1    2    3   4    5   6   7   8
> o    o   o   o  | o   o   o  o
> 
> then the processors will have continuous blocks of rows (proc 0, 0-3:
> proc 1: 4-7) or the other case:
> 
> 1    4    5   8    3   6   7   2
> o    o   o   o  | o   o   o  o
> 
> where proc 0 has rows 0,3,4,7 and proc 1 has rows 2, 5, 7, 1.
> Also, my method requires nodes in the region past partition boundary
> (for example nodes 3,6,7 contribute to proc 0), not just the nodes
> directly adjacent to the partition boundary.
> 
> And another question, can I do my calculations for partition boundary
> nodes (nodes involved with communication) and then: call
> GlobalAssemble,  do the calculations for my interior nodes, and call
> FillComplete ?
> 
> Thanks,
> Scot
> 
> 
> 
> 
> 
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