import time
import sys
from multiprocessing import Process


numOfLoops = 10000000

if (len(sys.argv) != 2):
    print "Correct Usage: python cpu.py 'no_of_processes'"
    sys.exit()

#function for each process
def fpOps():
    a = float(0.0)
    for i in xrange(0, numOfLoops):
        a += 0.5
        #print a #for debugging purpose

processes = []
numOfProcesses = int(sys.argv[1])
numOfOps = numOfLoops * numOfProcesses

for i in xrange(0, numOfProcesses):
    processes.append(Process(target=fpOps))

start = time.time()
for process in processes:
    process.start()
for process in processes:
    process.join()
end = time.time()

execTime = end - start
print "Exec Time " , execTime


FLOPS = (float(numOfOps/execTime))
print "FLOPS : " , FLOPS