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orte_snapc(7) man page (version 1.3.4)

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       Open RTE MCA Snapshot Coordination (SnapC) Framework - Overview of Open
       RTE's SnapC framework, and selected modules.  Open MPI 1.3.4


       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
       application,  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.


       In  order  for  a  process to use the Open RTE SnapC components it must
       adhear 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.


       Open RTE ships with one SnapC component: full.

       The following MCA parameters apply to all components:

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

           The directory to store the checkpoint snapshots. Default is /tmp.

   full SnapC Component
       The full component gathers together the local  snapshots  to  the  disk
       local  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 hierarchy of coordinators.

       The full component has the following MCA parameters:

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

           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.

1.3.4                            Nov 11, 2009                    ORTE_SNAPC(7)

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