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OMPI_CRCP - Open MPI MCA Checkpoint/Restart Coordination Protocol
(CRCP) Framework: Overview of Open MPI’s CRCP framework, and selected modules.
Open MPI 4.1.7
The CRCP Framework is used by Open MPI for
the encapsulation of various Checkpoint/Restart Coordination Protocols
(e.g., Coordinated, Uncoordinated, Message/Communication Induced, ...).
In order for a process to use the Open MPI CRCP components
it must adhear to a few programmatic requirements.
First, the program must
call MPI_INIT early in its execution.
The program must call MPI_FINALIZE
before termination.
A user may initiate a checkpoint of a parallel application
by using the ompi-checkpoint(1) and ompi-restart(1) commands.
Open MPI currently ships with one CRCP component: coord.
The
following MCA parameters apply to all components:
- crcp_base_verbose
- Set
the verbosity level for all components. Default is 0, or silent except on
error.
The coord component implements a Coordinated
Checkpoint/Restart Coordination Protocol similar to the one implemented
in LAM/MPI.
The coord component has the following MCA parameters:
- crcp_coord_priority
- The component’s priority to use when selecting the most appropriate component
for a run.
- crcp_coord_verbose
- Set the verbosity level for this component.
Default is 0, or silent except on error.
The none
component simply selects no CRCP component. All of the CRCP function calls
return immediately with OMPI_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 Open MPI will attempt
to activate all of the available components before falling back to this
component.
ompi-checkpoint(1), ompi-restart(1), opal-checkpoint(1),
opal-restart(1),
orte_snapc(7), orte_filem(7), opal_crs(7)
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