/usr/lib/python2.7/dist-packages/mpi4py/__main__.py is in python-mpi4py 2.0.0-3.
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# Contact: dalcinl@gmail.com
"""
Run some benchmarks and tests
"""
import sys as _sys
def helloworld(comm, args=None, verbose=True):
"""
Hello, World! using MPI
"""
from . import MPI
from optparse import OptionParser
parser = OptionParser(prog="mpi4py helloworld")
parser.add_option("-q", "--quiet", action="store_false",
dest="verbose", default=verbose)
(options, args) = parser.parse_args(args)
size = comm.Get_size()
rank = comm.Get_rank()
name = MPI.Get_processor_name()
message = ("Hello, World! I am process %*d of %d on %s.\n"
% (len(str(size - 1)), rank, size, name))
comm.Barrier()
if rank > 0:
comm.Recv([None, 'B'], rank - 1)
if options.verbose:
_sys.stdout.write(message)
_sys.stdout.flush()
if rank < size - 1:
comm.Send([None, 'B'], rank + 1)
comm.Barrier()
return message
def ringtest(comm, args=None, verbose=True):
"""
Time a message going around the ring of processes
"""
# pylint: disable=too-many-locals
# pylint: disable=too-many-branches
from . import MPI
from array import array
from optparse import OptionParser
parser = OptionParser(prog="mpi4py ringtest")
parser.add_option("-q", "--quiet", action="store_false",
dest="verbose", default=verbose)
parser.add_option("-n", "--size", type="int", default=1, dest="size",
help="message size")
parser.add_option("-s", "--skip", type="int", default=0, dest="skip",
help="number of warm-up iterations")
parser.add_option("-l", "--loop", type="int", default=1, dest="loop",
help="number of iterations")
(options, args) = parser.parse_args(args)
def ring(comm, n=1, loop=1, skip=0):
# pylint: disable=invalid-name
# pylint: disable=bad-whitespace
# pylint: disable=missing-docstring
iterations = list(range((loop + skip)))
size = comm.Get_size()
rank = comm.Get_rank()
source = (rank - 1) % size
dest = (rank + 1) % size
Sendrecv = comm.Sendrecv
Send = comm.Send
Recv = comm.Recv
Wtime = MPI.Wtime
sendmsg = array('B', [+42]) * n
recvmsg = array('B', [0x0]) * n
if size == 1:
for i in iterations:
if i == skip:
tic = Wtime()
Sendrecv(sendmsg, dest, 0,
recvmsg, source, 0)
else:
if rank == 0:
for i in iterations:
if i == skip:
tic = Wtime()
Send(sendmsg, dest, 0)
Recv(recvmsg, source, 0)
else:
sendmsg = recvmsg
for i in iterations:
if i == skip:
tic = Wtime()
Recv(recvmsg, source, 0)
Send(sendmsg, dest, 0)
toc = Wtime()
if comm.rank == 0 and sendmsg != recvmsg: # pragma: no cover
import warnings
import traceback
try:
warnings.warn("received message does not match!")
except UserWarning:
traceback.print_exc()
comm.Abort(2)
return toc - tic
size = getattr(options, 'size', 1)
loop = getattr(options, 'loop', 1)
skip = getattr(options, 'skip', 0)
comm.Barrier()
elapsed = ring(comm, size, loop, skip)
if options.verbose and comm.rank == 0:
message = ("time for %d loops = %g seconds (%d processes, %d bytes)\n"
% (loop, elapsed, comm.size, size))
_sys.stdout.write(message)
_sys.stdout.flush()
return elapsed
def main(args=None):
"Entry-point for ``python -m mpi4py``"
from optparse import OptionParser
from . import __name__ as prog
from . import __version__ as version
parser = OptionParser(prog=prog, version='%prog ' + version,
usage="%prog [options] <command> [args]")
parser.add_option("--no-threads",
action="store_false", dest="threads", default=True,
help="initialize MPI without thread support")
parser.add_option("--thread-level", type="choice", metavar="LEVEL",
choices=["single", "funneled", "serialized", "multiple"],
action="store", dest="thread_level", default="multiple",
help="initialize MPI with required thread support")
parser.add_option("--mpe",
action="store_true", dest="mpe", default=False,
help="use MPE for MPI profiling")
parser.add_option("--vt",
action="store_true", dest="vt", default=False,
help="use VampirTrace for MPI profiling")
parser.disable_interspersed_args()
(options, args) = parser.parse_args(args)
from . import rc, profile
rc.threads = options.threads
rc.thread_level = options.thread_level
if options.mpe:
profile('mpe', logfile='mpi4py')
if options.vt:
profile('vt', logfile='mpi4py')
from . import MPI
comm = MPI.COMM_WORLD
if not args:
if comm.rank == 0:
parser.print_usage()
parser.exit()
command = args.pop(0)
if command not in main.commands:
if comm.rank == 0:
parser.error("unknown command '%s'" % command)
parser.exit(2)
command = main.commands[command]
command(comm, args=args)
parser.exit()
main.commands = {
'helloworld': helloworld,
'ringtest': ringtest,
}
if __name__ == '__main__':
main()
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