Routine issnddhs

Description

This is one of the four multi-block routines that provide the connection between domain decomposition at the host and at the level of the nodes, see Fig. 1.

The purpose of this routine is to copy the arrays of virtual unknowns for all blocks to the local copies at the nodes. Based on itopol and iadmin, it decides wether or not to do a local copy or a PVM send. Since the virt arrays are shared between the host and the node residing on the host, the local copy is not needed. If an issend call is used, then the entire virt arrays for the subdomains are sent using PVM, see multi-block messages. See Fig. 3 for a schematical overview of issnddhs and isrcddnd.

  
Figure 3: Communication from host to node

Heading

subroutine issnddhs(nblocks, itrans, ilev, ind,  
                    isiinput, isvirt,  iadmin)

Parameters

integer

nblocks, itrans, ilev, ind, isiinput(*), isvirt(*), iadmin(*)

-

nblocks

number of blocks

itrans

indicates the quantities to be transported

ilev

the time level at which multi-block transport occurs

ind

sequence number of the node to send the message to

isiinput

array of pointers to the subdomain iinput arrays

isvirt

array of pointers to the subdomain virt arrays.

iadmin

reserved

Input

The virt arrays for the subdomains are filled. A message to node ind has already been started.

Output

None of the parameters are effected by this subroutine. The message to node ind has not been terminated and can still be appended to.

See also

isrcddhs, issnddnd, isrcddnd, issend