NAME

OMPI_CRCP - Open MPI MCA Checkpoint/Restart Coordination Protocol (CRCP) Framework: Overview of Open MPI's CRCP framework, and selected modules. Open MPI 4.1.4

DESCRIPTION

The CRCP Framework is used by Open MPI for the encapsulation of various Checkpoint/Restart Coordination Protocols (e.g., Coordinated, Uncoordinated, Message/Communication Induced, ...).

GENERAL PROCESS REQUIREMENTS

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.

AVAILABLE COMPONENTS

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.

coord CRCP Component

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.

none CRCP Component

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.