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
def ringtest(comm):
size = 1
loop = 1
skip = 0
lib.MPI_Barrier(comm)
elapsed = ring(comm, size, loop, skip)
size_p = ffi.new("int*")
rank_p = ffi.new("int*")
lib.MPI_Comm_size(comm, size_p)
lib.MPI_Comm_rank(comm, rank_p)
comm_size = size_p[0]
comm_rank = rank_p[0]
if comm_rank == 0:
print("time for %d loops = %g seconds (%d processes, %d bytes)" % (loop, elapsed, comm_size, size))
def ringtest(comm):
size = ( 1 )
loop = ( 1 )
skip = ( 0 )
lib.MPI_Barrier(comm)
elapsed = ring(comm, size, loop, skip)
size_p = ffi.new('int*')
rank_p = ffi.new('int*')
lib.MPI_Comm_size(comm, size_p)
lib.MPI_Comm_rank(comm, rank_p)
comm_size = size_p[0]
comm_rank = rank_p[0]
if comm_rank == 0:
print ("time for %d loops = %g seconds (%d processes, %d bytes)"
% (loop, elapsed, comm_size, size))
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()
def osu_latency(
BENCHMARH = "MPI Latency Test",
skip = 1000,
loop = 10000,
skip_large = 10,
loop_large = 100,
large_message_size = 8192,
MAX_MSG_SIZE = 1<<22,
):
myid = ffi.new('int*')
numprocs = ffi.new('int*')
MPI_Comm_rank(MPI_COMM_WORLD, myid)
MPI_Comm_size(MPI_COMM_WORLD, numprocs)
myid = myid[0]
numprocs = numprocs[0]
if numprocs != 2:
if myid == 0:
errmsg = "This test requires exactly two processes"
else:
errmsg = None
raise SystemExit(errmsg)
sbuf = ffi.new('unsigned char[]', MAX_MSG_SIZE)
rbuf = ffi.new('unsigned char[]', MAX_MSG_SIZE)
dtype = MPI_BYTE
tag = 1
comm = MPI_COMM_WORLD
status = MPI_STATUS_IGNORE
if myid == 0:
print ('# %s' % (BENCHMARH,))
if myid == 0:
print ('# %-8s%20s' % ("Size [B]", "Latency [us]"))
message_sizes = [0] + [2**i for i in range(30)]
for size in message_sizes:
if size > MAX_MSG_SIZE:
break
if size > large_message_size:
skip = skip_large
loop = loop_large
iterations = list(range(loop+skip))
#
MPI_Barrier(comm)
if myid == 0:
for i in iterations:
if i == skip:
t_start = MPI_Wtime()
MPI_Send(sbuf, size, dtype, 1, tag, comm)
MPI_Recv(rbuf, size, dtype, 1, tag, comm, status)
t_end = MPI_Wtime()
elif myid == 1:
for i in iterations:
MPI_Recv(rbuf, size, dtype, 0, tag, comm, status)
MPI_Send(sbuf, size, dtype, 0, tag, comm)
#
if myid == 0:
latency = (t_end - t_start) * 1e6 / (2 * loop)
print ('%-10d%20.2f' % (size, latency))
def osu_latency(
BENCHMARH="MPI Latency Test",
skip=1000,
loop=10000,
skip_large=10,
loop_large=100,
large_message_size=8192,
MAX_MSG_SIZE=1 << 22,
):
myid = ffi.new('int*')
numprocs = ffi.new('int*')
lib.MPI_Comm_rank(lib.MPI_COMM_WORLD, myid)
lib.MPI_Comm_size(lib.MPI_COMM_WORLD, numprocs)
myid = myid[0]
numprocs = numprocs[0]
if numprocs != 2:
if myid == 0:
errmsg = "This test requires exactly two processes"
else:
errmsg = None
raise SystemExit(errmsg)
sbuf = ffi.new('unsigned char[]', MAX_MSG_SIZE)
rbuf = ffi.new('unsigned char[]', MAX_MSG_SIZE)
dtype = lib.MPI_BYTE
tag = 1
comm = lib.MPI_COMM_WORLD
status = lib.MPI_STATUS_IGNORE
if myid == 0:
print('# %s' % (BENCHMARH, ))
if myid == 0:
print('# %-8s%20s' % ("Size [B]", "Latency [us]"))
message_sizes = [0] + [2**i for i in range(30)]
for size in message_sizes:
if size > MAX_MSG_SIZE:
break
if size > large_message_size:
skip = skip_large
loop = loop_large
iterations = list(range(loop + skip))
#
lib.MPI_Barrier(comm)
if myid == 0:
for i in iterations:
if i == skip:
t_start = lib.MPI_Wtime()
lib.MPI_Send(sbuf, size, dtype, 1, tag, comm)
lib.MPI_Recv(rbuf, size, dtype, 1, tag, comm, status)
t_end = lib.MPI_Wtime()
elif myid == 1:
for i in iterations:
lib.MPI_Recv(rbuf, size, dtype, 0, tag, comm, status)
lib.MPI_Send(sbuf, size, dtype, 0, tag, comm)
#
if myid == 0:
latency = (t_end - t_start) * 1e6 / (2 * loop)
print('%-10d%20.2f' % (size, latency))
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()
