зеркало из https://github.com/microsoft/spark.git
38 строки
1.3 KiB
Python
Executable File
38 строки
1.3 KiB
Python
Executable File
#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership.
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# The ASF licenses this file to You under the Apache License, Version 2.0
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# (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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import sys
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from random import random
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from operator import add
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from pyspark import SparkContext
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if __name__ == "__main__":
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if len(sys.argv) == 1:
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print >> sys.stderr, "Usage: pi <master> [<slices>]"
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exit(-1)
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sc = SparkContext(sys.argv[1], "PythonPi")
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slices = int(sys.argv[2]) if len(sys.argv) > 2 else 2
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n = 100000 * slices
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def f(_):
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x = random() * 2 - 1
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y = random() * 2 - 1
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return 1 if x ** 2 + y ** 2 < 1 else 0
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count = sc.parallelize(xrange(1, n+1), slices).map(f).reduce(add)
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print "Pi is roughly %f" % (4.0 * count / n)
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