Multiple communicators

[irfan.khan at gatech.edu]

I use seperete communicators for fluid and solid ranks in a fluid-structure interaction code. I use PETSc tools (KSP) to solve for the solid phase (FEA) which is carried out under a different communicator (FEA_Comm). 

Unless I am doing something wrong, I have found that the command line options: -ksp_type; -mat_partitioning_type, don't work if there are 2 communicators. But for single communicator they work. Please see the attached files containing output of -log_summary for 2 different codes (scroll down to the end). One with single communicator and the other with two communicators. Both the output have been generated with the same PETSc compilation. 

Futher -log_summary results are not able to detect all the events that have been registered if they are not in the WORLD communicator. 


Thank you 
Irfan 
----- Original Message ----- 
From: "Matthew Knepley" <knepley at gmail.com> 
To: "PETSc users list" <petsc-users at mcs.anl.gov> 
Sent: Tuesday, November 24, 2009 8:03:00 PM GMT -05:00 US/Canada Eastern 
Subject: Re: Multiple communicators 

On Tue, Nov 24, 2009 at 6:59 PM, < irfan.khan at gatech.edu > wrote: 





Hello 

Does the procedure for providing command line options and to obtain profiling data through -log_summary change if there are multiple MPI communicators in a petsc code? 


There is always WORLD, so it should be fine unless I misunderstand your question. 

Matt 




If so, can somebody point me to information, references on how to provide command line options if there are multiple communicators? 

Thank you 
Irfan 

-- 
PhD Candidate 
G.W. Woodruff School of Mechanical Engineering 
Georgia Institute of Technology 
Atlanta, GA (30332) 



-- 
What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. 
-- Norbert Wiener 


-- 
PhD Candidate 
G.W. Woodruff School of Mechanical Engineering 
Georgia Institute of Technology 
Atlanta, GA (30332) 
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