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
manifest hash:
24d9f928a463f46708b0e11fb781d5a241851424
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+ hg help
hg commands:
add add the specified files on the next commit
addremove add all new files, delete all missing files
annotate show changeset information per file line
cat output the latest or given revision of a file
commit commit the specified files or all outstanding changes
copy mark a file as copied or renamed for the next commit
diff diff working directory (or selected files)
export dump the changeset header and diffs for a revision
forget don't add the specified files on the next commit
heads show current repository heads
help show help for a given command or all commands
history show the changelog history
identify print information about the working copy
init create a new repository or copy an existing one
log show the revision history of a single file
manifest output the latest or given revision of the project manifest
parents show the parents of the current working dir
patch import an ordered set of patches
pull pull changes from the specified source
push push changes to the specified destination
rawcommit raw commit interface
recover roll back an interrupted transaction
remove remove the specified files on the next commit
serve export the repository via HTTP
status show changed files in the working directory
tags list repository tags
tip show the tip revision
undo undo the last transaction
update update or merge working directory
verify verify the integrity of the repository
+ hg add -h
hg add: option -h not recognized
hg add [files]
add the specified files on the next commit
+ hg help diff
hg diff [-r A] [-r B] [files]
-r --rev
revision
diff working directory (or selected files)
+ hg help foo
hg: unknown command foo
+ hg commands
hg: unknown command 'commands'
hg commands:
add add the specified files on the next commit
addremove add all new files, delete all missing files
annotate show changeset information per file line
cat output the latest or given revision of a file
commit commit the specified files or all outstanding changes
copy mark a file as copied or renamed for the next commit
diff diff working directory (or selected files)
export dump the changeset header and diffs for a revision
forget don't add the specified files on the next commit
heads show current repository heads
help show help for a given command or all commands
history show the changelog history
identify print information about the working copy
init create a new repository or copy an existing one
log show the revision history of a single file
manifest output the latest or given revision of the project manifest
parents show the parents of the current working dir
patch import an ordered set of patches
pull pull changes from the specified source
push push changes to the specified destination
rawcommit raw commit interface
recover roll back an interrupted transaction
remove remove the specified files on the next commit
serve export the repository via HTTP
status show changed files in the working directory
tags list repository tags
tip show the tip revision
undo undo the last transaction
update update or merge working directory
verify verify the integrity of the repository
+ exit 0