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ORTE_SNAPC(7)			   Open	MPI			 ORTE_SNAPC(7)

NAME
       ORTE_SNAPC  -  Open  RTE	 MCA  Snapshot Coordination (SnapC) Framework:
       Overview	of Open	RTE's SnapC framework, and selected modules.  Open MPI
       1.10.6

DESCRIPTION
       Open RTE	can coordinate the generation of a global snapshot of a	paral-
       lel job from many distributed local snapshots. The components  in  this
       framework determine how to: Initiate the	checkpoint of the parallel ap-
       plication, gather together the many distributed	local  snapshots,  and
       provide	the  user  with	a global snapshot handle reference that	can be
       used to restart the parallel application.

GENERAL	PROCESS	REQUIREMENTS
       In order	for a process to use the Open RTE SnapC	components it must ad-
       hear to a few programmatic requirements.

       First,  the  program  must  call	ORTE_INIT early	in its execution. This
       should only be called once, and it is not possible  to  checkpoint  the
       process without it first	having called this function.

       The program must	call ORTE_FINALIZE before termination.

       A user may initiate a checkpoint	of a parallel application by using the
       orte-checkpoint(1) and orte-restart(1) commands.

AVAILABLE COMPONENTS
       Open RTE	ships with one SnapC component:	full.

       The following MCA parameters apply to all components:

       snapc_base_verbose
	   Set the verbosity level for all components. Default is 0, or	silent
	   except on error.

   full	SnapC Component
       The full	component gathers together the local snapshots to the disk lo-
       cal to the Head Node Process (HNP) before completing the	checkpoint  of
       the process. This component does	not currently support replicated HNPs,
       or timer	based gathering	of local snapshot data.	This is	a 3-tiered hi-
       erarchy of coordinators.

       The full	component has the following MCA	parameters:

       snapc_full_priority
	   The component's priority to use when	selecting the most appropriate
	   component for a run.

       snapc_full_verbose
	   Set the verbosity level for this component. Default is 0, or	silent
	   except on error.

   none	SnapC Component
       The  none component simply selects no SnapC component. All of the SnapC
       function	calls return immediately with ORTE_SUCCESS.

       This component is the last component to be selected  by	default.  This
       means  that  if	another	component is available,	and the	none component
       was not explicity requested then	ORTE will attempt to activate  all  of
       the available components	before falling back to this component.

SEE ALSO
	 orte-checkpoint(1),	orte-restart(1),   opal-checkpoint(1),	 opal-
       restart(1), orte_filem(7), opal_crs(7)

1.10.6				 Feb 17, 2017			 ORTE_SNAPC(7)

NAME | DESCRIPTION | GENERAL PROCESS REQUIREMENTS | AVAILABLE COMPONENTS | SEE ALSO

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