Interlaced vectors.

[billy at dem.uminho.pt]

Right now, they are 3 separate VecCreateGhost that are updated at the same time 
using 3 calls to VecGhostUpdateBegin and VecGhostUpdateEnd. I read that putting 
them into a single call might accelerate communication. The question what is 
the best way to do this? 

Billy.


Citando Lisandro Dalcin <dalcinl at gmail.com>:

> On 7/4/07, billy at dem.uminho.pt <billy at dem.uminho.pt> wrote:
> > Hi,
> >
> > I have a velocity vector (u,v,w) with 3 updates. Is there an efficient way
> to
> > interlace the 3 vectors into 1 update without creating a new data
> structure?
> 
> Look at VecStrideScatter, but not sure exactly what you need. Can
> elaborate a bit more? What are x,u,v? Sepparate PETSc Vec's, or just a
> Vec with consecutive entries?
> 
> -- 
> Lisandro Dalcín
> ---------------
> Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
> Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
> Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
> PTLC - Güemes 3450, (3000) Santa Fe, Argentina
> Tel/Fax: +54-(0)342-451.1594
> 
>