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pvm_reg_rm.3PVM

NAME

pvm_reg_rm - Register task as PVM resource manager.

SYNOPSIS

 C       #include <pvmsdpro.h>
 
         int cc = pvm_reg_rm( struct pvmhostinfo **hip )
 
         struct pvmhostinfo {
 
                 int  hi_tid;
 
                 char *hi_name;
 
                 char *hi_arch;
 
                 int  hi_speed;
 
         };
 
 
 Fortran Not Available
 

PARAMETERS

hostp

Returns pointer to a pvmhostinfo structure which contains information about the master host.

DESCRIPTION

Registers the calling task as a PVM task and slave host manager. This means it intercepts certain libpvm calls from other tasks in order to have a say in scheduling policy. The resource manager will asynchronously receive messages from tasks containing requests for service, as well as messages from pvmds notifying it of system failures.

Before you start using this function, be warned that it's not a trivial thing, i.e. you can't just call it to turn off the default round-robin task assignment. Rather, it allows you to write your own resource manager and hook it to PVM.

To understand what the following messages mean, you should refer to the PVM source code and/or user guide section on implementation; There's just too much to say about them.

When one of the following libpvm functions is called in a task with resource manager set, the given message tag is sent to to resource manager.

     Libpvm call           RM message        Normal message
     pvm_addhosts()        SM_ADDHOST        TM_ADDHOST
     pvm_config()          SM_CONFIG         TM_CONFIG
     pvm_delhosts()        SM_DELHOST        TM_DELHOST
     pvm_notify()          SM_NOTIFY         TM_NOTIFY
     pvm_spawn()           SM_SPAWN          TM_SPAWN
     pvm_tasks()           SM_TASK           TM_TASK
     pvm_reg_rm()          SM_SCHED          TM_SCHED
 

The resource manager must in turn compose the following messages and send them to the pvmds:

     RM message        Normal message
     SM_EXEC           DM_EXEC
     SM_EXECACK        DM_EXECACK
     SM_ADD            DM_ADD
     SM_ADDACK         DM_ADDACK
     SM_HANDOFF        (none - change of resource manager)
 

The following messages are sent asynchronously to the resource manager by the system:

     RM message        Meaning
     SM_TASKX          notify of task exit/fail
     SM_HOSTX          notify of host delete/fail
 

The resource manager task must use pvm_setopt(PvmResvTids, 1) to allow sending reserved messages. Messages should be packed using encoding PvmDataDefault to ensure they can be unpacked anywhere in the system.

pvm_reg_rm() returns PvmOk when successful.

SEE ALSO

pvm_addhosts(3PVM), pvm_config(3PVM), pvm_delhosts(3PVM), pvm_notify(3PVM), pvm_spawn(3PVM), pvm_tasks(3PVM)