数百メガバイトの大きな辞書があり、それをディスク上の棚に作りたいとしましょう。pyparを使用してMPIを使用し、マスターリストのクリーンなビットを生成しています。これを達成するための最良の方法は何ですか?例:
# much earlier
masterDict = shelve.open( 'aShelveFile' )
# .. . . . .
# then we work out which parts of masterDict to keep
# and we put into aCleanDict
# then use mpi pypar to send the cleaned bits to the master rank
if pypar.rank() == 0:
tempdict = {}
for p in range(1,pypar.size()):
tempdict.append(pypar.receive(p))
for l1 in tempdict:
for l2 in l1:
realDict.append(l2)
for p in range(1,pypar.size()):
pypar.send(realDict,p)
# now realDict has all the cleaned bits
# which we send to the other hosts
else:
pypar.send(aCleanDict, 0 )
aCleanDict = pypar.receive( 0 )
# now to replace masterDict with aCleanDict
# note: cannot send shelve dictonaries using pypar
# insert stackover flow code here.