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[WIP] Warn mp start method #215

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[WIP] Warn mp start method #215

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c0dca6a
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keisukefukuda Mar 1, 2018
3087640
minor fix
keisukefukuda Mar 1, 2018
798bf75
Works only comm.size > 1
keisukefukuda Mar 1, 2018
9fd4386
fix pep8
keisukefukuda Mar 1, 2018
c5c6405
bugfix
keisukefukuda Mar 1, 2018
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14 changes: 14 additions & 0 deletions chainermn/optimizers.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,18 @@
import chainer
import copy
import multiprocessing.pool
import warnings


def _check_mp_start_method(comm):
"""Show a warning if multiprocessing's start_method is not 'forkserver'."""
method = multiprocessing.get_start_method()

if comm.size > 1 and comm.rank == 0:
if method is not 'forkserver':
warnings.warn("multiprocessing's `start_method` must be "
"'forkserver' (now it's '{}')".format(method),
stacklevel=2)


class _MultiNodeOptimizer(object):
Expand Down Expand Up @@ -164,6 +176,8 @@ def create_multi_node_optimizer(actual_optimizer, communicator,
Returns:
The multi node optimizer based on ``actual_optimizer``.
"""
_check_mp_start_method(communicator)

if double_buffering:
from chainermn.communicators.pure_nccl_communicator \
import PureNcclCommunicator
Expand Down