topooverview.tex

刚才是说明 现在是安装程序在 LINUX环境下进行编程的MPICH安装文件

 The MPI collective and topology routines can benefit from information 
 about the topology of the underlying interconnect.  Unfortunately, there
 is no best form for the representation (the MPI-1 Forum tried to define
 such a representation, but was unable to).  One useful decomposition
 that has been used in cluster enviroments is a hierarchical decomposition.

 The other obviously useful topology information would match the needs of 
 \texttt{MPI_Cart_create}.  However, it may be simpler to for the device to 
 implement this routine directly.

 Other useful information could be the topology information that matches
 the needs of the collective operation, such as spanning trees and rings.
 These may be added to ADI3 later.

 Question: Should we define a cart create function?  Dims create?

\subsection{Usage}
 This routine has nothing to do with the choice of communication method
 that a implementation of the ADI may make.  It is intended only to
 communicate information on the heirarchy of processes, if any, to 
 the implementation of the collective communication routines.  This routine
 may also be useful for the MPI Graph topology functions.