Provided by: openmpi-checkpoint_1.4.3-2.1ubuntu3_i386
ORTE_SNAPC - Open RTE MCA Snapshot Coordination (SnapC) Framework:
Overview of Open RTE's SnapC framework, and selected modules. Open MPI
Open RTE can coordinate the generation of a global snapshot of a
parallel 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.
GENERAL PROCESS REQUIREMENTS
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.
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.
orte-checkpoint(1), orte-restart(1), opal-checkpoint(1), opal-
restart(1), orte_filem(7), opal_crs(7)