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astrobokonon wants to merge 2 commits into from
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Limiting number of multiprocessing threads/cores #16

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d11fc9d
Begining of changes to add limit_cores option into the multiprocessin…
Nov 3, 2011
456e063
Fixed a few small tyops, seems to work as desired.
astrobokonon Nov 3, 2011
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17 changes: 13 additions & 4 deletions pyevolve/GPopulation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -151,13 +151,13 @@ def __init__(self, genome):
self.allSlots = [self.scaleMethod]

self.internalParams = {}
self.multiProcessing = (False, False)
self.multiProcessing = (False, False, False)

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

def setMultiProcessing(self, flag=True, full_copy=False):
def setMultiProcessing(self, flag=True, full_copy=False, limit_cores=False):
""" 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 @@ -167,6 +167,7 @@ def setMultiProcessing(self, flag=True, full_copy=False):

:param flag: True (default) or False
:param full_copy: True or False (default)
:param limit_cores: Number of cores to use or just all use them all (default)

.. 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 @@ -176,7 +177,7 @@ def setMultiProcessing(self, flag=True, full_copy=False):
The `setMultiProcessing` method.

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

def setMinimax(self, minimax):
""" Sets the population minimax
Expand Down Expand Up @@ -362,7 +363,15 @@ 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()

# Check for the numer of cores to use
if self.multiProcessing[2] is not False and (self.multiProcessing[2] <= CPU_COUNT and self.multiProcessing[2] > 0):
proc_pool = Pool(processes=self.multiProcessing[2])
logging.debug("You have limited the number of cores to be used to %d out of %d CPU cores available" % (self.multiProcessing[2], CPU_COUNT))
else:
proc_pool = Pool(processes=CPU_COUNT)
logging.debug("Warning: Too many cores requested! You asked for %d out of %d CPU cores available, so defaulting back to using all of them." % (self.multiprocessing[2], CPU_COUNT))


# Multiprocessing full_copy parameter
if self.multiProcessing[1]:
Expand Down
11 changes: 8 additions & 3 deletions pyevolve/GSimpleGA.py
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Original file line number Diff line number Diff line change
Expand Up @@ -72,7 +72,7 @@
import logging

from time import time
from types import BooleanType
from types import BooleanType, IntType
from sys import platform as sys_platform
from sys import stdout as sys_stdout

Expand Down Expand Up @@ -381,7 +381,7 @@ def __repr__(self):
ret+="\n"
return ret

def setMultiProcessing(self, flag=True, full_copy=False):
def setMultiProcessing(self, flag=True, full_copy=False, limit_cores=False):
""" 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 @@ -401,6 +401,7 @@ def setMultiProcessing(self, flag=True, full_copy=False):

:param flag: True (default) or False
:param full_copy: True or False (default)
:param limit_cores: Number of cores to use or just use them all (default)

.. 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 @@ -422,7 +423,11 @@ 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)
if type(limit_cores) != BooleanType:
if type(limit_cores) != IntType:
Util.raiseException("Multiprocessing 'limit_cores' option must be either False or an Integer number of processes to spawn", TypeError)

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

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