def ring(comm, count=1, loop=1, skip=0):
size_p = ffi.new("int*")
rank_p = ffi.new("int*")
lib.MPI_Comm_size(comm, size_p)
lib.MPI_Comm_rank(comm, rank_p)
size = size_p[0]
rank = rank_p[0]
source = (rank - 1) % size
dest = (rank + 1) % size
sbuf = ffi.new("unsigned char[]", [42] * count)
rbuf = ffi.new("unsigned char[]", [0] * count)
iterations = list(range((loop + skip)))
if size == 1:
for i in iterations:
if i == skip:
tic = lib.MPI_Wtime()
lib.MPI_Sendrecv(
sbuf, count, lib.MPI_BYTE, dest, 0, rbuf, count, lib.MPI_BYTE, source, 0, comm, lib.MPI_STATUS_IGNORE
)
else:
if rank == 0:
for i in iterations:
if i == skip:
tic = lib.MPI_Wtime()
lib.MPI_Send(sbuf, count, lib.MPI_BYTE, dest, 0, comm)
lib.MPI_Recv(rbuf, count, lib.MPI_BYTE, source, 0, comm, lib.MPI_STATUS_IGNORE)
else:
sbuf = rbuf
for i in iterations:
if i == skip:
tic = lib.MPI_Wtime()
lib.MPI_Recv(rbuf, count, lib.MPI_BYTE, source, 0, comm, lib.MPI_STATUS_IGNORE)
lib.MPI_Send(sbuf, count, lib.MPI_BYTE, dest, 0, comm)
toc = lib.MPI_Wtime()
if rank == 0 and ffi.string(sbuf) != ffi.string(rbuf):
import warnings, traceback
try:
warnings.warn("received message does not match!")
except UserWarning:
traceback.print_exc()
lib.MPI_Abort(comm, 2)
return toc - tic
def ring(comm, count=1, loop=1, skip=0):
size_p = ffi.new('int*')
rank_p = ffi.new('int*')
lib.MPI_Comm_size(comm, size_p)
lib.MPI_Comm_rank(comm, rank_p)
size = size_p[0]
rank = rank_p[0]
source = (rank - 1) % size
dest = (rank + 1) % size
sbuf = ffi.new('unsigned char[]', [42]*count)
rbuf = ffi.new('unsigned char[]', [ 0]*count)
iterations = list(range((loop+skip)))
if size == 1:
for i in iterations:
if i == skip:
tic = lib.MPI_Wtime()
lib.MPI_Sendrecv(sbuf, count, lib.MPI_BYTE, dest, 0,
rbuf, count, lib.MPI_BYTE, source, 0,
comm, lib.MPI_STATUS_IGNORE)
else:
if rank == 0:
for i in iterations:
if i == skip:
tic = lib.MPI_Wtime()
lib.MPI_Send(sbuf, count, lib.MPI_BYTE, dest, 0, comm)
lib.MPI_Recv(rbuf, count, lib.MPI_BYTE, source, 0, comm, lib.MPI_STATUS_IGNORE)
else:
sbuf = rbuf
for i in iterations:
if i == skip:
tic = lib.MPI_Wtime()
lib.MPI_Recv(rbuf, count, lib.MPI_BYTE, source, 0, comm, lib.MPI_STATUS_IGNORE)
lib.MPI_Send(sbuf, count, lib.MPI_BYTE, dest, 0, comm)
toc = lib.MPI_Wtime()
if rank == 0 and ffi.string(sbuf) != ffi.string(rbuf):
import warnings, traceback
try:
warnings.warn("received message does not match!")
except UserWarning:
traceback.print_exc()
lib.MPI_Abort(comm, 2)
return toc - tic
from libmpi import ffi, lib
NULL = ffi.NULL
size_p = ffi.new('int*')
rank_p = ffi.new('int*')
nlen_p = ffi.new('int*')
name_p = ffi.new('char[]', lib.MPI_MAX_PROCESSOR_NAME);
lib.MPI_Init(NULL, NULL);
lib.MPI_Comm_size(lib.MPI_COMM_WORLD, size_p)
lib.MPI_Comm_rank(lib.MPI_COMM_WORLD, rank_p)
lib.MPI_Get_processor_name(name_p, nlen_p)
size = size_p[0]
rank = rank_p[0]
nlen = nlen_p[0]
name = ffi.string(name_p[0:nlen])
print("Hello, World! I am process %d of %d on %s."
% (rank, size, name))
lib.MPI_Finalize()
from libmpi import ffi, lib
NULL = ffi.NULL
size_p = ffi.new('int*')
rank_p = ffi.new('int*')
nlen_p = ffi.new('int*')
name_p = ffi.new('char[]', lib.MPI_MAX_PROCESSOR_NAME)
lib.MPI_Init(NULL, NULL)
lib.MPI_Comm_size(lib.MPI_COMM_WORLD, size_p)
lib.MPI_Comm_rank(lib.MPI_COMM_WORLD, rank_p)
lib.MPI_Get_processor_name(name_p, nlen_p)
size = size_p[0]
rank = rank_p[0]
nlen = nlen_p[0]
name = ffi.string(name_p[0:nlen])
print("Hello, World! I am process %d of %d on %s." % (rank, size, name))
lib.MPI_Finalize()
