Mercurial > hg
view tests/test-repo-compengines.t @ 42743:8c9a6adec67a
rust-discovery: using the children cache in add_missing
The DAG range computation often needs to get back to very old
revisions, and turns out to be disproportionately long, given
that the end goal is to remove the descendents of the given
missing revisons from the undecided set.
The fast iteration capabilities available in the Rust case make
it possible to avoid the DAG range entirely, at the cost of
precomputing the children cache, and to simply iterate on
children of the given missing revisions.
This is a case where staying on the same side of the interface
between the two languages has clear benefits.
On discoveries with initial undecided sets
small enough to bypass sampling entirely, the total cost of
computing the children cache and the subsequent iteration
becomes better than the Python + C counterpart, which relies on
reachableroots2.
For example, on a repo with more than one million revisions with
an initial undecided set of 11 elements, we get these figures:
Rust version with simple iteration
addcommons: 57.287us
first undecided computation: 184.278334ms
first children cache computation: 131.056us
addmissings iteration: 42.766us
first addinfo total: 185.24 ms
Python + C version
first addcommons: 0.29 ms
addcommons 0.21 ms
first undecided computation 191.35 ms
addmissings 45.75 ms
first addinfo total: 237.77 ms
On discoveries with large undecided sets, the initial price paid
makes the first addinfo slower than the Python + C version,
but that's more than compensated by the gain in sampling and
subsequent iterations.
Here's an extreme example with an undecided set of a million revisions:
Rust version:
first undecided computation: 293.842629ms
first children cache computation: 407.911297ms
addmissings iteration: 34.312869ms
first addinfo total: 776.02 ms
taking initial sample
query 2: sampling time: 1318.38 ms
query 2; still undecided: 1005013, sample size is: 200
addmissings: 143.062us
Python + C version:
first undecided computation 298.13 ms
addmissings 80.13 ms
first addinfo total: 399.62 ms
taking initial sample
query 2: sampling time: 3957.23 ms
query 2; still undecided: 1005013, sample size is: 200
addmissings 52.88 ms
Differential Revision: https://phab.mercurial-scm.org/D6428
author | Georges Racinet <georges.racinet@octobus.net> |
---|---|
date | Tue, 16 Apr 2019 01:16:39 +0200 |
parents | 624080e8bd9f |
children | da2c360899c9 |
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A new repository uses zlib storage, which doesn't need a requirement $ hg init default $ cd default $ cat .hg/requires dotencode fncache generaldelta revlogv1 sparserevlog store testonly-simplestore (reposimplestore !) $ touch foo $ hg -q commit -A -m 'initial commit with a lot of repeated repeated repeated text to trigger compression' $ hg debugrevlog -c | grep 0x78 0x78 (x) : 1 (100.00%) 0x78 (x) : 110 (100.00%) $ cd .. Unknown compression engine to format.compression aborts $ hg --config format.revlog-compression=unknown init unknown abort: compression engine unknown defined by format.revlog-compression not available (run "hg debuginstall" to list available compression engines) [255] A requirement specifying an unknown compression engine results in bail $ hg init unknownrequirement $ cd unknownrequirement $ echo exp-compression-unknown >> .hg/requires $ hg log abort: repository requires features unknown to this Mercurial: exp-compression-unknown! (see https://mercurial-scm.org/wiki/MissingRequirement for more information) [255] $ cd .. #if zstd $ hg --config format.revlog-compression=zstd init zstd $ cd zstd $ cat .hg/requires dotencode fncache generaldelta revlog-compression-zstd revlogv1 sparserevlog store testonly-simplestore (reposimplestore !) $ touch foo $ hg -q commit -A -m 'initial commit with a lot of repeated repeated repeated text' $ hg debugrevlog -c | grep 0x28 0x28 : 1 (100.00%) 0x28 : 98 (100.00%) $ cd .. Specifying a new format.compression on an existing repo won't introduce data with that engine or a requirement $ cd default $ touch bar $ hg --config format.revlog-compression=zstd -q commit -A -m 'add bar with a lot of repeated repeated repeated text' $ cat .hg/requires dotencode fncache generaldelta revlogv1 sparserevlog store testonly-simplestore (reposimplestore !) $ hg debugrevlog -c | grep 0x78 0x78 (x) : 2 (100.00%) 0x78 (x) : 199 (100.00%) #endif checking zlib options ===================== $ hg init zlib-level-default $ hg init zlib-level-1 $ cat << EOF >> zlib-level-1/.hg/hgrc > [storage] > revlog.zlib.level=1 > EOF $ hg init zlib-level-9 $ cat << EOF >> zlib-level-9/.hg/hgrc > [storage] > revlog.zlib.level=9 > EOF $ commitone() { > repo=$1 > cp $RUNTESTDIR/bundles/issue4438-r1.hg $repo/a > hg -R $repo add $repo/a > hg -R $repo commit -m some-commit > } $ for repo in zlib-level-default zlib-level-1 zlib-level-9; do > commitone $repo > done $ $RUNTESTDIR/f -s */.hg/store/data/* default/.hg/store/data/foo.i: size=64 (pure !) zlib-level-1/.hg/store/data/a.i: size=4146 zlib-level-9/.hg/store/data/a.i: size=4138 zlib-level-default/.hg/store/data/a.i: size=4138 Test error cases $ hg init zlib-level-invalid $ cat << EOF >> zlib-level-invalid/.hg/hgrc > [storage] > revlog.zlib.level=foobar > EOF $ commitone zlib-level-invalid abort: storage.revlog.zlib.level is not a valid integer ('foobar') abort: storage.revlog.zlib.level is not a valid integer ('foobar') [255] $ hg init zlib-level-out-of-range $ cat << EOF >> zlib-level-out-of-range/.hg/hgrc > [storage] > revlog.zlib.level=42 > EOF $ commitone zlib-level-out-of-range abort: invalid value for `storage.revlog.zlib.level` config: 42 abort: invalid value for `storage.revlog.zlib.level` config: 42 [255] #if zstd checking zstd options ===================== $ hg init zstd-level-default --config format.revlog-compression=zstd $ hg init zstd-level-1 --config format.revlog-compression=zstd $ cat << EOF >> zstd-level-1/.hg/hgrc > [storage] > revlog.zstd.level=1 > EOF $ hg init zstd-level-22 --config format.revlog-compression=zstd $ cat << EOF >> zstd-level-22/.hg/hgrc > [storage] > revlog.zstd.level=22 > EOF $ commitone() { > repo=$1 > cp $RUNTESTDIR/bundles/issue4438-r1.hg $repo/a > hg -R $repo add $repo/a > hg -R $repo commit -m some-commit > } $ for repo in zstd-level-default zstd-level-1 zstd-level-22; do > commitone $repo > done $ $RUNTESTDIR/f -s zstd-*/.hg/store/data/* zstd-level-1/.hg/store/data/a.i: size=4097 zstd-level-22/.hg/store/data/a.i: size=4091 zstd-level-default/.hg/store/data/a.i: size=4094 Test error cases $ hg init zstd-level-invalid --config format.revlog-compression=zstd $ cat << EOF >> zstd-level-invalid/.hg/hgrc > [storage] > revlog.zstd.level=foobar > EOF $ commitone zstd-level-invalid abort: storage.revlog.zstd.level is not a valid integer ('foobar') abort: storage.revlog.zstd.level is not a valid integer ('foobar') [255] $ hg init zstd-level-out-of-range --config format.revlog-compression=zstd $ cat << EOF >> zstd-level-out-of-range/.hg/hgrc > [storage] > revlog.zstd.level=42 > EOF $ commitone zstd-level-out-of-range abort: invalid value for `storage.revlog.zstd.level` config: 42 abort: invalid value for `storage.revlog.zstd.level` config: 42 [255] #endif