Mercurial > hg
view contrib/fuzz/README.rst @ 40978:42f59d3f714d
delta: exclude base candidate much smaller than the target
If a revision's full text is that much bigger than a base candidate full text,
we no longer consider that candidate.
This solves a pathological case we encountered on a very specify repository.
It contains a long series of changesets with a very small manifest (one file)
co-existing with others changesets using a very large manifest.
Without this filtering, we ended up considering a large number of tiny full
snapshots as a potential base. It resulted in very large delta (the size of
the full text) and mercurial spending 99% of its time compressing these
deltas.
The timing of a commit moved from about 400s to about 10s (still slow, but not
ridiculously slow).
author | Boris Feld <boris.feld@octobus.net> |
---|---|
date | Mon, 17 Dec 2018 10:42:19 +0100 |
parents | e437de3881c1 |
children |
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How to add fuzzers (partially cribbed from oss-fuzz[0]): 1) git clone https://github.com/google/oss-fuzz 2) cd oss-fuzz 3) python infra/helper.py build_image mercurial 4) docker run --cap-add=SYS_PTRACE -it -v $HG_REPO_PATH:/hg-new \ gcr.io/oss-fuzz/mercurial bash 5) cd /src 6) rm -r mercurial 7) ln -s /hg-new mercurial 8) cd mercurial 9) compile 10) ls $OUT Step 9 is literally running the command "compile", which is part of the docker container. Once you have that working, you can build the fuzzers like this (in the oss-fuzz repo): python infra/helper.py build_fuzzers --sanitizer address mercurial $HG_REPO_PATH (you can also say "memory", "undefined" or "coverage" for sanitizer). Then run the built fuzzers like this: python infra/helper.py run_fuzzer mercurial -- $FUZZER 0: https://github.com/google/oss-fuzz/blob/master/docs/new_project_guide.md