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improve random file generation performance

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Makes the random file generator not generate more data
than the size of the file.  Previously it would generate
1 MB of data even if the file was much smaller.
This commit is contained in:
Steven Berler 2011-12-22 23:21:58 +00:00
parent aaf4219d8d
commit a6227f8acc
1 changed files with 6 additions and 4 deletions
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10
s3tests/realistic.py
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@ -3,6 +3,7 @@ import random
import string import string
import struct import struct
import time import time
import math
NANOSECOND = int(1e9) NANOSECOND = int(1e9)
@ -45,10 +46,11 @@ class RandomContentFile(object):
def _generate(self): def _generate(self):
# generate and return a chunk of pseudorandom data # generate and return a chunk of pseudorandom data
# 256 bits = 32 bytes at a time size = min(self.size, 1*1024*1024) # generate at most 1 MB at a time
size = 1*1024*1024 chunks = int(math.ceil(size/8.0)) # number of 8-byte chunks to create
l = [self.random.getrandbits(64) for _ in xrange(size/8)]
s = struct.pack((size/8)*'Q', *l) l = [self.random.getrandbits(64) for _ in xrange(chunks)]
s = struct.pack(chunks*'Q', *l)
return s return s
def read(self, size=-1): def read(self, size=-1):