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start.py
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start.py
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from multiprocessing import Process
import os
import sys
import entry
def rendering_process(filename, count):
temp_filename = filename + str(count)
print("pid {} running process, name {}".format(os.getpid(), temp_filename ))
entry.entry(temp_filename, count)
def combine_images(name, instancecount):
with open(name + ".ppm", "w") as target_file:
inputs = []
for i in range(instancecount):
fp = open(name + str(i), "r")
inputs.append(fp)
# just copy 3 first lines as is
for j in range(3):
line = fp.readline()
if i == 0:
target_file.write(line)
finished = False
while not finished:
r = 0
g = 0
b = 0
for i in range(instancecount):
fp = inputs[i]
line = fp.readline()
if not line:
finished = True
break
rt, gt, bt = line.split(" ")
r += int(rt)
g += int(gt)
b += int(bt)
if finished:
break
target_file.write("{} {} {}\n".format(int(r/instancecount),int(g/instancecount),int(b/instancecount)))
for i in range(instancecount):
inputs[i].close()
os.remove(name + str(i))
def main():
arglen = len(sys.argv)
instancevar = -1
count = 1
if arglen <= 1:
print("usage: python start.py <output filename> <process_count>")
sys.exit()
arg1 = sys.argv[1]
filename = arg1
if arglen > 2:
arg0 = sys.argv[0]
arg1 = sys.argv[1]
arg2 = sys.argv[2]
instancevar = arg2
filename = arg1
count = int(arg2)
process_list = []
print("starting")
for i in range(count):
p = Process(target=rendering_process, args=(filename, i))
process_list.append(p)
p.start()
print("started all")
# wait for all processes to finish
for i in range(count):
p = process_list[i]
p.join()
# combine_images
combine_images(filename, count)
print("finished all")
if __name__ == "__main__":
# execute only if run as a script
main()