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Add an optional max_processes parameter to setMultiProcessing() #58

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Merged
perone merged 1 commit into from
Aug 19, 2014
Merged

Add an optional max_processes parameter to setMultiProcessing() #58

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9 changes: 5 additions & 4 deletions pyevolve/GPopulation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -152,13 +152,13 @@ def __init__(self, genome):
self.allSlots = [self.scaleMethod]

self.internalParams = {}
self.multiProcessing = (False, False)
self.multiProcessing = (False, False, None)

# Statistics
self.statted = False
self.stats = Statistics()

def setMultiProcessing(self, flag=True, full_copy=False):
def setMultiProcessing(self, flag=True, full_copy=False, max_processes=None):
""" Sets the flag to enable/disable the use of python multiprocessing module.
Use this option when you have more than one core on your CPU and when your
evaluation function is very slow.
Expand All @@ -168,6 +168,7 @@ def setMultiProcessing(self, flag=True, full_copy=False):

:param flag: True (default) or False
:param full_copy: True or False (default)
:param max_processes: None (default) or an integer value

.. warning:: Use this option only when your evaluation function is slow, se you
will get a good tradeoff between the process communication speed and the
Expand All @@ -177,7 +178,7 @@ def setMultiProcessing(self, flag=True, full_copy=False):
The `setMultiProcessing` method.

"""
self.multiProcessing = (flag, full_copy)
self.multiProcessing = (flag, full_copy, max_processes)

def setMinimax(self, minimax):
""" Sets the population minimax
Expand Down Expand Up @@ -385,7 +386,7 @@ def evaluate(self, **args):
# We have multiprocessing
if self.multiProcessing[0] and MULTI_PROCESSING:
logging.debug("Evaluating the population using the multiprocessing method")
proc_pool = Pool()
proc_pool = Pool(processes=self.multiProcessing[2])

# Multiprocessing full_copy parameter
if self.multiProcessing[1]:
Expand Down
5 changes: 3 additions & 2 deletions pyevolve/GSimpleGA.py
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Original file line number Diff line number Diff line change
Expand Up @@ -383,7 +383,7 @@ def __repr__(self):
ret += "\n"
return ret

def setMultiProcessing(self, flag=True, full_copy=False):
def setMultiProcessing(self, flag=True, full_copy=False, max_processes=None):
""" Sets the flag to enable/disable the use of python multiprocessing module.
Use this option when you have more than one core on your CPU and when your
evaluation function is very slow.
Expand All @@ -403,6 +403,7 @@ def setMultiProcessing(self, flag=True, full_copy=False):

:param flag: True (default) or False
:param full_copy: True or False (default)
:param max_processes: None (default) or an integer value

.. warning:: Use this option only when your evaluation function is slow, so you'll
get a good tradeoff between the process communication speed and the
Expand All @@ -424,7 +425,7 @@ def setMultiProcessing(self, flag=True, full_copy=False):
if type(full_copy) != BooleanType:
Util.raiseException("Multiprocessing 'full_copy' option must be True or False", TypeError)

self.internalPop.setMultiProcessing(flag, full_copy)
self.internalPop.setMultiProcessing(flag, full_copy, max_processes)

def setMigrationAdapter(self, migration_adapter=None):
""" Sets the Migration Adapter
Expand Down