3.4   Dynamic configuration

• C interface
  int info = pvm_addhosts (char **hosts, int nhost,
   int *infos) int info = pvm_delhosts (char **hosts, int nhost,
   int *infos)
  • Add or delete a set of nhost hosts in the virtual machine
  • hosts is an array of pointers to character strings containing the names of the machine to be added or deleted
  • The argument infos is an array of length nhost that contains the status code for each host being added or deleted It allows the user to check if only one of a set of hosts caused a problem rather than trying to add or delete the entire set of hosts again 
    
    
  • Expensive operation that require the synchronization of the entire virtual machine

• Fortran interface
  call pvmfaddhost (host, info)
call pvmfdelhost (host, info)
  • Add or delete a the specified host in the virtual machine
  • host is character string containing the name of the machine to be added or deleted
  • The argument info contains the status code for the host being added or deleted
  • Expensive operation that require the synchronization of the entire virtual machine
    
    

• Example in C

  static char * hosts [] = {
     "mpp.lifl.fr",
     "alpha.lifl.fr",
  } ;
  int status [2], info, i ; 
  
  info = pvm_addhosts (hosts, 2, status) ; 
  if (info < 0)
    for (i=0; i<2; i++) 
      if (status [i] < 0)
        printf ("error (%d) in adding %s\n", 
                status [i], hosts [i]) ;
          

• Example in Fortran

  CALL PVMFADDHOST ('mpp.lifl.fr', INFO)
  IF (INFO .LT. 0) THEN
    WRITE (*,*) 'Error in adding mpp.lifl.fr', INFO
  ENDIF
  CALL PVMFADDHOST ('alpha.lifl.fr', INFO)
  IF (INFO .LT. 0) THEN 
    WRITE (*,*) 'Error in adding alpha.lifl.fr', INFO
  ENDIF