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Aide Scilab >> Calculs Parallèles avec PVM > pvm_bcast

pvm_bcast

broacasts a message to all members of a group

Calling Sequence

[info] = pvm_bcast(group, buff, msgtag)

Arguments

group

string, string group name of an existing group.

buff

data to be send (any Scilab object).

msgtag

integer, message tag supplied by the user.

info

integer,

Description

pvm_bcast broadcasts a message to all the members of the group named group.

In PVM 3.2 and later the broadcast message is not sent back to the sender. Any PVM task can call pvm_bcast(), it need not be a member of the group. The content of the message can be distinguished by its tag msgtag

The returned value infowill be zero if pvm_bcast is successful and will be will be < 0 if some error occurs.

pvm_bcast is asynchronous. Computation on the sending processor resumes as soon as the message is safely on its way to the receiving processors. This is in contrast to synchronous communication, during which computation on the sending processor halts until a matching receive is executed by all the receiving processors.

pvm_bcast first determines the tids of the group members by checking a group data base. A multicast is performed to these tids. If the group is changed during a broadcast the change will not be reflected in the broadcast. Multicasting is not supported by most multiprocessor vendors. Typically their native calls only support broadcasting to all the user's processes on a multiprocessor. Because of this omission, pvm_bcast may not be an efficient communication method on some multiprocessors.

See Also

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Last updated:
Wed Oct 05 12:11:04 CEST 2011