cmoverview.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

 Communication operations are non-blocking, with a completion
 counter.  In some cases, the address of the counter may be specified as 
 \texttt{NULL}; where this is
 true, completion must be ensured by some other test.  Counters are used
 instead of boolean flags to provide a way to handle operations that 
 involve multiple (internal) steps.

 Flow control is the responsibility of the device; these routines are
 non-blocking, allowing the device to queue communication for
 later completion.
 
 Because the communication/data transfer routines (e.g., \texttt{MPID_Put_contig}, 
 \texttt{MPID_Get_contig}, and \texttt{MPID_Isend}) are nonblocking, the buffers 
 containing the data to 
 be transfered must not be modified until the operation has (locally) 
 completed (as marked by the appropriate counter).

 Because it may be necessary to update the reference count on the MPI 
 objects, there are few parameters that may be specified as \texttt{const}.