Mercurial > hg
view tests/test-issue4074.t @ 33799:05264fc9d8d6
util: make nogc effective for CPython
279cd80059d4 made `util.nogc` a no-op. It was to optimize PyPy. But it slows
down CPython if many objects (like 300k+) are created.
For example, running `hg log -r .` without extensions in `hg-committed` with
14k+ obsmarkers have the following times:
before | after
hg | chg | hg | chg
-----------------------------
1.262 | 0.860 | 1.077 | 0.619 (seconds, best of 20 runs)
Therefore let's re-enable nogc for CPython.
Differential Revision: https://phab.mercurial-scm.org/D402
author | Jun Wu <quark@fb.com> |
---|---|
date | Mon, 14 Aug 2017 22:28:59 -0700 |
parents | 24849d53697d |
children | 57c671cf7a69 |
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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 xrange(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)