1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
from mpi4py import MPI
from mpi4py.futures import MPIPoolExecutor, get_comm_workers, wait
def helloworld():
comm = get_comm_workers()
comm.Barrier()
size = comm.Get_size()
rank = comm.Get_rank()
name = MPI.Get_processor_name()
greet = f"Hello, World! I am worker {rank} of {size} on {name}."
sbuf = bytearray(128)
rbuf = bytearray(128)
dest = (rank + 1) % size
source = (rank - 1) % size
rbuf[: len(greet)] = greet.encode()
for _ in range(size):
sbuf, rbuf = rbuf, sbuf
comm.Sendrecv(sbuf, dest, 42, rbuf, source, 42)
return bytes(rbuf).decode()
if __name__ == "__main__":
executor = MPIPoolExecutor(5)
futures = []
for _ in range(executor.num_workers):
f = executor.submit(helloworld)
futures.append(f)
wait(futures)
for f in futures:
print(f.result())
executor.shutdown()
|
