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import math
import os
import time
from cogent3.util import parallel
def is_prime(n):
r = parallel.get_rank()
print(f"Rank: {r}")
if n % 2 == 0:
return False
sqrt_n = int(math.floor(math.sqrt(n)))
for i in range(3, sqrt_n + 1, 2):
if n % i == 0:
return False
return True
PRIMES = [
112272535095293,
112582705942171,
112272535095293,
115280095190773,
115797848077099,
117450548693743,
993960000099397,
] * 4 # multiplying just to increase the amount of data to calculate
print(f"World size: {parallel.size}\n")
start = time.time()
result = parallel.map(is_prime, PRIMES, max_workers=4)
print(f"{time.time() - start:.2f} seconds\n")
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