/parallel_fibonacci.py Secret
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March 23, 2016 22:34
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import os | |
import sys | |
import time | |
if sys.version_info[:2] < (3, 4): | |
print('Python 3.4+ is required') | |
sys.exit(os.EX_SOFTWARE) | |
import ipyparallel as parallel | |
# Run `ipcluster3 start -n 4` or similar beforehand | |
client = parallel.Client() | |
print('Parallel tasks: {p}'.format(p=client.ids)) | |
lview = client.load_balanced_view() | |
def fibonacci(n): | |
a, b = 0, 1 | |
for i in range(n): | |
a, b = b, a + b | |
return n, a | |
tick = time.time() | |
MAX = 100 | |
amr = lview.map(fibonacci, range(MAX), chunksize=4, ordered=False) | |
pending = set(amr.msg_ids) | |
new_tasks = [] | |
while pending: | |
try: | |
client.wait(pending, 1e-3) | |
except parallel.TimeoutError: | |
pass | |
finished = pending.difference(client.outstanding) | |
pending = pending.difference(finished) | |
for msgid in finished: | |
ares = client.get_result(msgid) | |
print('== Engine ID: {eid} =='.format(eid=ares.engine_id)) | |
try: | |
for n, fib in ares.get(): | |
print(' fib({n}): {f}'.format( | |
n=n, | |
f=fib, | |
)) | |
if n % 10 == 0: | |
print('Injecting new job at n == {n}, ' | |
'computing fibonacci({m})'.format(n=n, m=MAX + n + 1)) | |
new_ares = lview.map(fibonacci, [MAX + n + 1]) | |
pending = pending.union(set(new_ares.msg_ids)) | |
new_tasks.extend(new_ares.msg_ids) | |
except Exception: | |
import traceback | |
traceback.print_exc() | |
import pdb | |
pdb.set_trace() | |
print(new_tasks) | |
print('Total time: {t}'.format(t=time.time() - tick)) |
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