Commit 73cc9da0 authored by Neil Gershenfeld's avatar Neil Gershenfeld
Browse files

wip

parent e95d406f
Pipeline #4918 passed with stage
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#
# mpipi.py
# mpipi2.py
# Neil Gershenfeld 2/6/20
# calculation of pi by an MPI Numba sum
# pi = 3.14159265358979323846
......@@ -9,6 +9,13 @@ import time
from numba import jit
from mpi4py import MPI
NPTS = 1000000000
NLOOP = 10
comm = MPI.COMM_WORLD
rank = comm.Get_rank()
nproc = comm.Get_size()
@jit(nopython=True)
def calc(istart,iend):
sum = 0.0
......@@ -16,22 +23,26 @@ def calc(istart,iend):
sum += 0.5/((i-0.75)*(i-0.25))
return sum
NPTS = 100000000000
comm = MPI.COMM_WORLD
rank = comm.Get_rank()
nproc = comm.Get_size()
if (rank == 0):
start_time = time.time()
istart = int(1 + NPTS*((rank+0)/nproc))
iend = int(NPTS*((rank+1)/nproc))
pi = calc(istart,iend)
comm.reduce(pi,op=MPI.SUM,root=0)
end_time = time.time()
mflops = NPTS*5.0/(1.0e6*(end_time-start_time))
print("NPTS = %d, pi = %f"%(NPTS,pi))
print("time = %f, estimated MFlops = %f"%(end_time-start_time,mflops))
istart = 1+rank*NPTS;
iend = (rank+1)*NPTS;
max = 0
for j in range(NLOOP):
comm.Barrier()
start_time = time.time()
sum = 0.0;
sum = calc(istart,iend)
pi = comm.reduce(sum,op=MPI.SUM,root=0)
end_time = time.time()
mflops = nproc*NPTS*5.0/(1.0e6*(end_time-start_time))
print("processes = %d, NPTS = %d, pi = %f"%(nproc,NPTS,pi))
if (mflops > max):
max = mflops
print("time = %f, estimated MFlops = %f, max = %f"%(end_time-start_time,mflops,max))
else:
istart = int(1 + NPTS*((rank+0)/nproc))
iend = int(NPTS*((rank+1)/nproc))
pi = calc(istart,iend)
comm.reduce(pi,op=MPI.SUM,root=0)
istart = 1+rank*NPTS
iend = (rank+1)*NPTS
for j in range(NLOOP):
comm.Barrier()
sum = calc(istart,iend)
comm.reduce(sum,op=MPI.SUM,root=0)
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