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)

Check Out this Related Man Page

CONFIG(3PVM)							  PVM Version 3.4						      CONFIG(3PVM)

NAME

       pvm_config - Returns information about the present virtual machine configuration.

SYNOPSIS

       C    int info = pvm_config( int *nhost, int *narch, struct pvmhostinfo **hostp )
	    struct pvmhostinfo {
		 int  hi_tid;
		 char *hi_name;
		 char *hi_arch;
		 int  hi_speed;
	    };

       Fortran	 call pvmfconfig( nhost, narch, dtid, name, arch, speed, info )

PARAMETERS

       nhost   Integer returning the number of hosts (pvmds) in the virtual machine.

       narch   Integer returning the number of different data formats being used.

       hostp   Returns pointer to an array of structures which contain information about each host including its pvmd task ID, name, architecture,
	       and relative speed.

       dtid    Integer returning pvmd task ID for host

       name    Character string returning name of host

       arch    Character string returning architecture name of host

       speed   Integer returning relative speed of host. Default value is 1000.

       info    Integer status code returned by the routine.  Values less than zero indicate an error.

DESCRIPTION

       The routine pvm_config returns information about the present virtual machine. The information returned is similar to  that  available  from
       the console command conf.

       The  C  function  returns information about the entire virtual machine in one call. The Fortran function returns information about one host
       per call and cycles through all the hosts.  Thus, if pvmfconfig is called nhost times, the entire virtual machine will be represented.

       Note that in C the hostp array is allocated and owned by libpvm.  It is automatically freed or reused on the next call to pvm_config.

       Note that in Fortran the reported value of nhost and the  host configuration do not change until the function resets at the end of  a  com-
       plete cycle.  The user can reset pvmfconfig() at any time by calling it with nhost = -1.

       If pvm_config is successful, info will be 0.  If some error occurs then info will be < 0.

EXAMPLES

       C:
	    struct pvmhostinfo *hostp;
	    int i, nhost, narch;

	    info = pvm_config( &nhost, &narch, &hostp );
	    for (i = 0; i < nhost; i++)
		 printf("%s
", hostp[i].hi_name);

       Fortran:
	    Do i=1, NHOST
	      CALL PVMFCONFIG( NHOST,NARCH,DTID(i),HOST(i),ARCH(i),SPEED(i),INFO )
	    Enddo

ERRORS

       The following error condition can be returned by pvm_config

       PvmSysErr
	      pvmd not responding.

SEE ALSO

       pvm_tasks(3PVM)

								  31 August, 1994						      CONFIG(3PVM)

Linux and UNIX Man Pages

pvmfaddhost(3pvm) [debian man page]

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