pvmfaddhost(3pvm) [debian man page]

ADDHOSTS(3PVM)							  PVM Version 3.4						    ADDHOSTS(3PVM)

NAME

       pvm_addhosts - Add hosts to the virtual machine.

SYNOPSIS

       C    int info = pvm_addhosts( char **hosts, int nhost, int *infos )

       Fortran	 call pvmfaddhost( host, info )

PARAMETERS

       hosts   An  array  of strings naming the hosts to be added.  Pvmd must already be installed and the user must have an account on the speci-
	       fied hosts.

       nhost   Integer specifying the length of array hosts.

       infos   Integer array of length nhost which returns the status for each host.  Values less than zero indicate an error, while positive val-
	       ues are TIDs of the new hosts.

       host    Character string naming the host to be added.

       info    Integer	status	code  returned	by  the routine.  Values less than nhost indicate partial failure, and values less than 1 indicate
	       total failure.

DESCRIPTION

       The routine pvm_addhosts adds the computers named in hosts to the configuration of computers making up  the  virtual  machine.	The  names
       should have the same syntax as lines of a pvmd hostfile (see man page for pvmd3): A hostname followed by options of the form xx=y.

       If  pvm_addhosts is successful, info will be equal to nhost.  Partial success is indicated by 0 < info < nhost, and total failure by info <
       1.  The array infos can be checked to determine which host caused the error.

       The Fortran routine pvmfaddhost adds a single host to the configuration with each call.	info will be 1 if successful or < 0 if error.

       The status of hosts can be requested by the application using pvm_mstat and pvm_config.	If a host fails it will be  automatically  deleted
       from  the  configuration.   Using  pvm_addhosts a replacement host can be added by the application, however it is the responsibility of the
       application developer to make his application tolerant of host failure.	Another use of this feature would be to add  more  hosts  as  they
       become available, for example on a weekend, or if the application dynamically determines it could use more computational power.

EXAMPLES

       C:
	    static char *hosts[] = {
		"sparky",
		"thud.cs.utk.edu",
	    };
	    info = pvm_addhosts( hosts, 2, infos );

       Fortran:
	    CALL PVMFADDHOST( 'azure', INFO )

ERRORS

       The following error conditions can be returned by pvm_addhosts:

       PvmBadParam
	      giving an invalid argument value.

       PvmAlready
	      another task is currently adding hosts.

       PvmSysErr
	      local pvmd is not responding.

       and in the infos vector:

       PvmBadParam
	      bad hostname syntax.

       PvmNoHost
	      no such host.

       PvmCantStart
	      failed to start pvmd on host.

       PvmDupHost
	      host already configured.

       PvmBadVersion
	      pvmd protocol versions don't match.

       PvmOutOfRes
	      PVM has run out of system resources.

SEE ALSO

       pvm_pvmd3(1PVM), pvm_delhosts(3PVM), pvm_start_pvmd(3PVM), pvm_config(3PVM), pvm_mstat(3PVM)

								 22 February, 1994						    ADDHOSTS(3PVM)

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DELHOSTS(3PVM)							  PVM Version 3.4						    DELHOSTS(3PVM)

NAME

       pvm_delhosts - Deletes hosts from the virtual machine.

SYNOPSIS

       C    int info = pvm_delhosts( char **hosts, int nhost, int *infos )

       Fortran	 call pvmfdelhost( host, info )

PARAMETERS

       hosts   An array of pointers to character strings containing the names of the machines to be deleted.

       nhost   Integer specifying the number of hosts to be deleted.

       infos   Integer	array  of  length nhost which contains the status code returned by the routine for the individual hosts.  Values less than
	       zero indicate an error.

       host    Character string containing the name of the machine to be deleted.

       info    Integer status code returned by the routine.  Values less than nhost indicate partial failure, values less than	1  indicate  total
	       failure.

DESCRIPTION

       The  routine  pvm_delhosts  deletes  the  computers  pointed to in hosts from the existing configuration of computers making up the virtual
       machine.  All PVM processes and the pvmd running on these computers are killed as the computer is deleted.  If pvm_delhosts is  successful,
       info  will  be  nhost.  Partial success is indicated by 1<= info < nhost, and total failure by info < 1.  The array infos can be checked to
       determine which host caused the error.

       The Fortran routine pvmfdelhost deletes a single host from the configuration with each call.

       If a host fails, the PVM system will continue to function and will automatically delete this host from the virtual machine.  An application
       can  be notified of a host failure by calling pvm_notify.  It is still the responsibility of the application developer to make his applica-
       tion tolerant of host failure.

EXAMPLES

       C:
	    static char *hosts[] = {
		 "sparky",
		 "thud.cs.utk.edu",
	    };
	    int status[2];
	    info = pvm_delhosts( hosts, 2, status );

       Fortran:
	    CALL PVMFDELHOST( 'azure', INFO )

ERRORS

       These error conditions can be returned by pvm_delhosts

       PvmBadParam
	      giving an invalid argument value.

       PvmSysErr
	      local pvmd not responding.

SEE ALSO

       pvm_addhosts(3PVM), pvm_notify(3PVM)

								  30 August, 1993						    DELHOSTS(3PVM)

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pvmfaddhost(3pvm) [debian man page]

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