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# -*- encoding=utf-8 -*-
# Possible executions of this script
# ./yadempi script.py #interactive will spawn 3 additional workers
# mpiexec -n 4 ./yadempi script.py #non interactive
NSTEPS = 1000 #turn it >0 to see time iterations, else only initilization TODO!HACK
#NSTEPS=50 #turn it >0 to see time iterations, else only initilization
N = 50
M = 50
#(columns, rows) per thread
import os
from yade import mpy as mp
numThreads = 4
# sequential grain colors
import colorsys
colorScale = (Vector3(colorsys.hsv_to_rgb(value * 1.0 / numThreads, 1, 1)) for value in range(0, numThreads))
#add spheres
for sd in range(0, numThreads - 1):
col = next(colorScale)
ids = []
for i in range(N): #(numThreads-1) x N x M spheres, one thread is for master and will keep only the wall, others handle spheres
for j in range(M):
id = O.bodies.append(
sphere((sd * N + i + j / 30., j, 0), 0.500, color=col)
) #a small shift in x-positions of the rows to break symmetry
ids.append(id)
for id in ids:
O.bodies[id].subdomain = sd + 1
WALL_ID = O.bodies.append(box(center=(numThreads * N * 0.5, -0.5, 0), extents=(2 * numThreads * N, 0, 2), fixed=True))
collider.verletDist = 0.5
collider.targetInterv = 0
newton.gravity = (0, -10, 0) #else nothing would move
tsIdx = O.engines.index(timeStepper) #remove the automatic timestepper. Very important: we don't want subdomains to use many different timesteps...
O.engines = O.engines[0:tsIdx] + O.engines[tsIdx + 1:]
O.dt = 0.001 #this very small timestep will make it possible to run 2000 iter without merging
#O.dt=0.1*PWaveTimeStep() #very important, we don't want subdomains to use many different timesteps...
######### RUN ##########
def collectTiming():
created = os.path.isfile("collect.dat")
f = open('collect.dat', 'a')
if not created:
f.write("numThreads mpi omp Nspheres N M runtime \n")
from yade import timing
f.write(
str(numThreads) + " " + str(os.getenv('OMPI_COMM_WORLD_SIZE')) + " " + os.getenv('OMP_NUM_THREADS') + " " + str(N * M * (numThreads - 1)) +
" " + str(N) + " " + str(M) + " " + str(timing.runtime()) + "\n"
)
f.close()
# customize mpy
mp.MERGE_W_INTERACTIONS = False
mp.ERASE_REMOTE_MASTER = False
mp.mpirun(NSTEPS + 1, 4, True) #+1 in order to be consistent with other example scripts
mp.mprint("num. bodies:", len([b for b in O.bodies]), len(O.bodies))
mp.mprint("Partial force on floor=" + str(O.forces.f(WALL_ID)[1]))
#demonstrate getting stuff from workers
if mp.rank == 0:
print("kinetic energy from workers: " + str(mp.sendCommand([1, 2], "kineticEnergy()", True)))
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