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ADVISE(3PVM) PVM Version 3.4 ADVISE(3PVM) NAME pvm_advise() - Controls use of direct task-to-task routing. [In Version 3.2: Replaced by pvm_setopt] SYNOPSIS C int info = pvm_advise( int route ) Fortran call pvmfadvise( route, info ) PARAMETERS route Integer advising PVM to set up direct task-to-task links. route options PvmDontRoute 1 Don't allow direct links to this task PvmAllowDirect 2 Allow but don't request direct links PvmRouteDirect 3 Request direct links info Integer returning error status. DESCRIPTION The routine pvm_advise advises PVM on whether or not to set up direct task-to-task links (using TCP) for all subsequent communication. Once a link is established it remains until the application finishes. If a direct link can not be established because one of the two tasks has re- quested PvmDontRoute or because no resources are available, then the default route through the PVM daemons is used. pvm_advise can be called multiple times to selectively establish direct links, but is typically set only once near the beginning of each task. PvmAllowDi- rect is the default advise setting. This setting on task A allows other tasks to set up direct links to A. Once a direct link is estab- lished between tasks both tasks will use it for sending messages. pvm_advise returns the error status in info. The performance of direct task-to-task links can be up to a factor of two better than the default route. The draw back is a lack of scalability of the direct links. Some versions of UNIX limit the number of links to no more than 30. EXAMPLES C: info = pvm_advise( PvmRouteDirect ); Fortran: CALL PVMFADVISE( PVMROUTEDIRECT, INFO ) ERRORS This error condition can be returned by pvm_advise PvmBadParam giving an invalid route value. SEE ALSO pvm_setopt(3PVM) 30 August, 1993 ADVISE(3PVM)
NAME | SYNOPSIS | PARAMETERS | DESCRIPTION | EXAMPLES | ERRORS | SEE ALSO
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