pvm_reg_rm(3)
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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.

DISCUSSION

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 must be packed using data format PvmDataFoo.

pvm_reg_rm() returns PvmOk when successful. pvm_spawn(3PVM), pvm_tasks(3PVM)


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