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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 requested PvmDon- tRoute 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. PvmAllowDirect 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 established between tasks both tasks will use it for sending messages. pvm_advise returns the error status in info. The per- formance 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 di- rect 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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