Thomas Arendsen Hein <thomas@intevation.de> [Thu, 16 Jun 2005 06:22:14 +0100] rev 379
Updated TODO
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Updated TODO
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mpm@selenic.com [Wed, 15 Jun 2005 21:18:35 -0800] rev 378
hgweb: missed a long hash
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hgweb: missed a long hash
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mpm@selenic.com [Wed, 15 Jun 2005 21:13:49 -0800] rev 377
Merge with TAH
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Merge with TAH
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Thomas Arendsen Hein <thomas@intevation.de> [Thu, 16 Jun 2005 05:44:05 +0100] rev 376
hgweb: fix deleted file in filediff key error
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hgweb: fix deleted file in filediff key error
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mpm@selenic.com [Wed, 15 Jun 2005 21:13:08 -0800] rev 375
Show nice short hashes in hgweb
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Show nice short hashes in hgweb
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mpm@selenic.com [Wed, 15 Jun 2005 21:12:28 -0800] rev 374
update tests to reflect new short hash length
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update tests to reflect new short hash length
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mpm@selenic.com [Wed, 15 Jun 2005 21:11:40 -0800] rev 373
Change the size of the short hash representation
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Change the size of the short hash representation
First note that this number doesn't really matter, as we always check
for ambiguous short hash ids.
Here's the math on collision probability:
>>> import math
>>> def p(f, n): return 1 - (1 / math.exp(n**2/(2*f)))
...
>>> p(2**32, 30000.0)
0.09947179164613551 # with 30000 changesets (BKCVS), we have a 9% chance
>>> p(2**32, 65000.0)
0.38850881217977273 # and with a full import from BK, we'd have a 39% chance
>>> p(2**40, 1e6)
0.36539171908447321 # we'd like to be "safe" for 1M csets, so 40 isn't enough
>>> p(2**48, 1e6)
0.001774780051374103 # But 48 looks good
>>> p(2**48, 1e7)
0.16275260939624481
>>> p(2**48, 5e6)
0.043437281083569146
>>> p(2**48, 2e6)
0.0070802434913129764
>>> p(2**48, 3e6)
0.01586009440574343
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