Commit 73cc9da0 by Neil Gershenfeld

### 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): istart = 1+rank*NPTS; iend = (rank+1)*NPTS; max = 0 for j in range(NLOOP): comm.Barrier() 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) sum = 0.0; sum = calc(istart,iend) pi = comm.reduce(sum,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)) 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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