Mock module for mpi4py.MPI to be used when MPI is not available or usage not desired. Not importing MPI increases launch speed significantly, which is important for CLI applications.

Used as the default communicator when config.options.mpi is False. Used when MPI is not available or not needed (i.e. not running under an MPI launcher).

Attributes

SUM=lambda a, b: a + b
MAX=max
COMM_WORLD:SerialComm=SerialComm()
Global serial communicator instance.
COMM_SELF:SerialComm=SerialComm()
Per-process serial communicator instance (distinct from COMM_WORLD).
COMM_NULL:NullComm=NullComm()
Null communicator sentinel — raises on use.

Classes

SerialComm

Attributes:

rank:int=0
size:int=1

SerialComm.barrier(self) -> None

No-op in serial mode.

SerialComm.bcast(self, data, root=0)

Identity broadcast — returns data unchanged.

Arguments:

data
root:int=0

SerialComm.scatter(self, data, root=0)

Identity scatter — returns data unchanged.

Arguments:

data
root:int=0

SerialComm.gather(self, data, root=0)

Identity gather — returns data unchanged.

Arguments:

data
root:int=0

SerialComm.allgather(self, data)

Return a single-element list containing data (serial all-gather).

Arguments:

data

SerialComm.allreduce(self, data, op=None)

Identity all-reduce — returns data unchanged.

Arguments:

data
op=None

SerialComm.reduce(self, data, op=None, root=0)

Identity reduce — returns data unchanged.

Arguments:

data
op=None
root:int=0

NullComm

Sentinel for COMM_NULL — raises RuntimeError on any attribute access.

In real MPI, COMM_NULL is an invalid communicator handle; attempting to use it is a programming error. This class makes such errors visible immediately.

NullComm.__getattr__(self, name)

Arguments:

name:str

bamboost.mpi.serial

Attributes

Classes

SerialComm

Attributes:

Arguments:

Arguments:

Arguments:

Arguments:

Arguments:

Arguments:

NullComm

Arguments:

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