[Users] PETSc in Cactus

[Wong Sum Thai]

Hi Erik,

Thanks for the clarification. I get the idea now.

 
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-----Original Message-----
From: users-bounces at cactuscode.org [mailto:users-bounces at cactuscode.org] On
Behalf Of Erik Schnetter
Sent: Wednesday, March 05, 2008 11:02 PM
To: Cactus users mailing list
Subject: Re: [Users] PETSc in Cactus

On Mar 5, 2008, at 04:06:16, Wong Sum Thai wrote:

> Hi,
>
> I have just started working with Cactus with the intention of using  
> PETSc as
> the underlying solver. Although I have yet to set up PETSc with  
> Cactus, I
> would like to know if I configure Cactus to use MPI, should I still  
> compile
> PETSc to use MPI as well? In this case, since Cactus is already  
> distributed
> among multiple processors, then PETSc will follow even if it is not  
> compile
> to use MPI.


Hi,

Cactus requires that PETSc is already installed independently of  
Cactus.  It can use only those features of PETSc which are already  
built in -- while PETSc solves a system, it has complete control for a  
short time to achieve maximum efficiency.  If you want to solve a  
system in parallel, both Cactus and PETSc need to be built with MPI.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>   http://www.cct.lsu.edu/~eschnett/

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