61 lines
1.8 KiB
Python
61 lines
1.8 KiB
Python
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from math import ceil
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from os import stat, getenv, path
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from pybloom import BloomFilter as BloomFilter1
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from pybloomfilter import BloomFilter as BloomFilter2
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import sqlite3
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from time import time
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# Ubuntu: apt-get install python-pybloomfiltermmap
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conn = sqlite3.connect(path.join(getenv("HOME"), '.config/PyBitmessage/messages.dat'))
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conn.text_factory = str
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cur = conn.cursor()
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rawlen = 0
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itemcount = 0
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cur.execute('''SELECT COUNT(hash) FROM inventory''')
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for row in cur.fetchall():
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itemcount = row[0]
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filtersize = 1000 * (int(itemcount / 1000) + 1)
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errorrate = 1.0 / 1000.0
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bf1 = BloomFilter1(capacity=filtersize, error_rate=errorrate)
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bf2 = BloomFilter2(capacity=filtersize, error_rate=errorrate)
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item = '''SELECT hash FROM inventory'''
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cur.execute(item, '')
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bf1time = 0
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bf2time = 0
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for row in cur.fetchall():
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rawlen += len(row[0])
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try:
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times = [time()]
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bf1.add(row[0])
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times.append(time())
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bf2.add(row[0])
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times.append(time())
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bf1time += times[1] - times[0]
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bf2time += times[2] - times[1]
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except IndexError:
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pass
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#f = open("/home/shurdeek/tmp/bloom.dat", "wb")
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#sb1.tofile(f)
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#f.close()
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print "Item count: %i" % (itemcount)
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print "Raw length: %i" % (rawlen)
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print "Bloom filter 1 length: %i, reduction to: %.2f%%" % \
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(bf1.bitarray.buffer_info()[1],
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100.0 * bf1.bitarray.buffer_info()[1] / rawlen)
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print "Bloom filter 1 capacity: %i and error rate: %.3f%%" % (bf1.capacity, 100.0 * bf1.error_rate)
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print "Bloom filter 1 took %.2fs" % (bf1time)
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print "Bloom filter 2 length: %i, reduction to: %.3f%%" % \
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(bf2.num_bits / 8,
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100.0 * bf2.num_bits / 8 / rawlen)
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print "Bloom filter 2 capacity: %i and error rate: %.3f%%" % (bf2.capacity, 100.0 * bf2.error_rate)
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print "Bloom filter 2 took %.2fs" % (bf2time)
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