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revlog: use radix tree also for matching keys shorter than 4 hex digits...

revlog: use radix tree also for matching keys shorter than 4 hex digits I don't know what the reason for the 4-digit limit was, and I can't think of any real disadvantages of using the radix tree also when the requested minimum length is short. This speeds up `hg log -T '{shortest(node,1)}\n'` from 2m16s to 4.5s by making that not fall back to pure code. Differential Revision: https://phab.mercurial-scm.org/D3453

Pulkit Goyal - - Load All Authors

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      #require no-pure

      A script to generate nasty diff worst-case scenarios:

        $ cat > s.py <<EOF

        > import random

        > for x in range(100000):

        >     print

        >     if random.randint(0, 100) >= 50:

        >         x += 1

        >     print(hex(x))

        > EOF

        $ hg init a

        $ cd a

      Check in a big file:

        $ $PYTHON ../s.py > a

        $ hg ci -qAm0

      Modify it:

        $ $PYTHON ../s.py > a

      Time a check-in, should never take more than 10 seconds user time:

        $ hg ci --time -m1

        time: real .* secs .user [0-9][.].* sys .* (re)

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				#require no-pure

				A script to generate nasty diff worst-case scenarios:

				$ cat > s.py <<EOF
				> import random
				> for x in range(100000):
				> print
				> if random.randint(0, 100) >= 50:
				> x += 1
				> print(hex(x))
				> EOF

				$ hg init a
				$ cd a

				Check in a big file:

				$ $PYTHON ../s.py > a
				$ hg ci -qAm0

				Modify it:

				$ $PYTHON ../s.py > a

				Time a check-in, should never take more than 10 seconds user time:

				$ hg ci --time -m1
				time: real .* secs .user [0-9][.].* sys .* (re)