Mercurial > hg
view tests/test-single-head.t @ 44363:f7459da77f23
nodemap: introduce an option to use mmap to read the nodemap mapping
The performance and memory benefit is much greater if we don't have to copy all
the data in memory for each information. So we introduce an option (on by
default) to read the data using mmap.
This changeset is the last one definition the API for index support nodemap
data. (they have to be able to use the mmaping).
Below are some benchmark comparing the best we currently have in 5.3 with the
final step of this series (using the persistent nodemap implementation in
Rust). The benchmark run `hg perfindex` with various revset and the following
variants:
Before:
* do not use the persistent nodemap
* use the CPython implementation of the index for nodemap
* use mmapping of the changelog index
After:
* use the MixedIndex Rust code, with the NodeTree object for nodemap access
(still in review)
* use the persistent nodemap data from disk
* access the persistent nodemap data through mmap
* use mmapping of the changelog index
The persistent nodemap greatly speed up most operation on very large
repositories. Some of the previously very fast lookup end up a bit slower because
the persistent nodemap has to be setup. However the absolute slowdown is very
small and won't matters in the big picture.
Here are some numbers (in seconds) for the reference copy of mozilla-try:
Revset Before After abs-change speedup
-10000: 0.004622 0.005532 0.000910 × 0.83
-10: 0.000050 0.000132 0.000082 × 0.37
tip 0.000052 0.000085 0.000033 × 0.61
0 + (-10000:) 0.028222 0.005337 -0.022885 × 5.29
0 0.023521 0.000084 -0.023437 × 280.01
(-10000:) + 0 0.235539 0.005308 -0.230231 × 44.37
(-10:) + :9 0.232883 0.000180 -0.232703 ×1293.79
(-10000:) + (:99) 0.238735 0.005358 -0.233377 × 44.55
:99 + (-10000:) 0.317942 0.005593 -0.312349 × 56.84
:9 + (-10:) 0.313372 0.000179 -0.313193 ×1750.68
:9 0.316450 0.000143 -0.316307 ×2212.93
On smaller repositories, the cost of nodemap related operation is not as big, so
the win is much more modest. Yet it helps shaving a handful of millisecond here
and there.
Here are some numbers (in seconds) for the reference copy of mercurial:
Revset Before After abs-change speedup
-10: 0.000065 0.000097 0.000032 × 0.67
tip 0.000063 0.000078 0.000015 × 0.80
0 0.000561 0.000079 -0.000482 × 7.10
-10000: 0.004609 0.003648 -0.000961 × 1.26
0 + (-10000:) 0.005023 0.003715 -0.001307 × 1.35
(-10:) + :9 0.002187 0.000108 -0.002079 ×20.25
(-10000:) + 0 0.006252 0.003716 -0.002536 × 1.68
(-10000:) + (:99) 0.006367 0.003707 -0.002660 × 1.71
:9 + (-10:) 0.003846 0.000110 -0.003736 ×34.96
:9 0.003854 0.000099 -0.003755 ×38.92
:99 + (-10000:) 0.007644 0.003778 -0.003866 × 2.02
Differential Revision: https://phab.mercurial-scm.org/D7894
| author | Pierre-Yves David <pierre-yves.david@octobus.net> |
|---|---|
| date | Tue, 11 Feb 2020 11:18:52 +0100 |
| parents | 88a306478556 |
| children | 4d5e2fd53707 |
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===================== Test workflow options ===================== $ . "$TESTDIR/testlib/obsmarker-common.sh" Test single head enforcing - Setup ============================================= $ cat << EOF >> $HGRCPATH > [experimental] > evolution = all > EOF $ hg init single-head-server $ cd single-head-server $ cat <<EOF >> .hg/hgrc > [phases] > publish = no > [experimental] > single-head-per-branch = yes > EOF $ mkcommit ROOT $ mkcommit c_dA0 $ cd .. $ hg clone single-head-server client updating to branch default 2 files updated, 0 files merged, 0 files removed, 0 files unresolved Test single head enforcing - with branch only --------------------------------------------- $ cd client continuing the current defaultbranch $ mkcommit c_dB0 $ hg push pushing to $TESTTMP/single-head-server searching for changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files creating a new branch $ hg up 'desc("ROOT")' 0 files updated, 0 files merged, 2 files removed, 0 files unresolved $ hg branch branch_A marked working directory as branch branch_A (branches are permanent and global, did you want a bookmark?) $ mkcommit c_aC0 $ hg push --new-branch pushing to $TESTTMP/single-head-server searching for changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files (+1 heads) Create a new head on the default branch $ hg up 'desc("c_dA0")' 1 files updated, 0 files merged, 1 files removed, 0 files unresolved $ mkcommit c_dD0 created new head $ hg push -f pushing to $TESTTMP/single-head-server searching for changes adding changesets adding manifests adding file changes transaction abort! rollback completed abort: rejecting multiple heads on branch "default" (2 heads: 286d02a6e2a2 9bf953aa81f6) [255] remerge them $ hg merge 1 files updated, 0 files merged, 0 files removed, 0 files unresolved (branch merge, don't forget to commit) $ mkcommit c_dE0 $ hg push pushing to $TESTTMP/single-head-server searching for changes adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 2 files Test single head enforcing - after rewrite ------------------------------------------ $ mkcommit c_dF0 $ hg push pushing to $TESTTMP/single-head-server searching for changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files $ hg commit --amend -m c_dF1 $ hg push pushing to $TESTTMP/single-head-server searching for changes adding changesets adding manifests adding file changes added 1 changesets with 0 changes to 1 files (+1 heads) 1 new obsolescence markers obsoleted 1 changesets Check it does not interfer with strip ------------------------------------- setup $ hg branch branch_A --force marked working directory as branch branch_A $ mkcommit c_aG0 created new head $ hg update 'desc("c_dF1")' 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ mkcommit c_dH0 $ hg update 'desc("c_aG0")' 1 files updated, 0 files merged, 1 files removed, 0 files unresolved $ hg merge 1 files updated, 0 files merged, 0 files removed, 0 files unresolved (branch merge, don't forget to commit) $ mkcommit c_aI0 $ hg log -G @ changeset: 10:49003e504178 |\ branch: branch_A | | tag: tip | | parent: 8:a33fb808fb4b | | parent: 3:840af1c6bc88 | | user: test | | date: Thu Jan 01 00:00:00 1970 +0000 | | summary: c_aI0 | | | | o changeset: 9:fe47ea669cea | | | parent: 7:99a2dc242c5d | | | user: test | | | date: Thu Jan 01 00:00:00 1970 +0000 | | | summary: c_dH0 | | | | o | changeset: 8:a33fb808fb4b | |/ branch: branch_A | | user: test | | date: Thu Jan 01 00:00:00 1970 +0000 | | summary: c_aG0 | | | o changeset: 7:99a2dc242c5d | | parent: 5:6ed1df20edb1 | | user: test | | date: Thu Jan 01 00:00:00 1970 +0000 | | summary: c_dF1 | | | o changeset: 5:6ed1df20edb1 | |\ parent: 4:9bf953aa81f6 | | | parent: 2:286d02a6e2a2 | | | user: test | | | date: Thu Jan 01 00:00:00 1970 +0000 | | | summary: c_dE0 | | | | | o changeset: 4:9bf953aa81f6 | | | parent: 1:134bc3852ad2 | | | user: test | | | date: Thu Jan 01 00:00:00 1970 +0000 | | | summary: c_dD0 | | | o | | changeset: 3:840af1c6bc88 | | | branch: branch_A | | | parent: 0:ea207398892e | | | user: test | | | date: Thu Jan 01 00:00:00 1970 +0000 | | | summary: c_aC0 | | | | o | changeset: 2:286d02a6e2a2 | |/ user: test | | date: Thu Jan 01 00:00:00 1970 +0000 | | summary: c_dB0 | | | o changeset: 1:134bc3852ad2 |/ user: test | date: Thu Jan 01 00:00:00 1970 +0000 | summary: c_dA0 | o changeset: 0:ea207398892e user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: ROOT actual stripping $ hg strip --config extensions.strip= --rev 'desc("c_dH0")' saved backup bundle to $TESTTMP/client/.hg/strip-backup/fe47ea669cea-a41bf5a9-backup.hg Test that closing heads are ignored by default ----------------------------------------------- $ hg up 'desc("c_aG0")' 0 files updated, 0 files merged, 2 files removed, 0 files unresolved $ mkcommit c_aJ0 created new head pushing the new head should fails $ hg push -f pushing to $TESTTMP/single-head-server searching for changes adding changesets adding manifests adding file changes transaction abort! rollback completed abort: rejecting multiple heads on branch "branch_A" (2 heads: 49003e504178 468bd81ccc5d) [255] closing the head and pushing should succeed $ mkcommit c_aK0 --close-branch $ hg push -f pushing to $TESTTMP/single-head-server searching for changes adding changesets adding manifests adding file changes added 4 changesets with 4 changes to 4 files (-1 heads) Test that closing heads can be explicitly accounted for ------------------------------------------------------- $ cat <<EOF >> $TESTTMP/single-head-server/.hg/hgrc > [experimental] > single-head-per-branch:account-closed-heads = yes > EOF $ hg up 'desc("c_aG0")' 0 files updated, 0 files merged, 2 files removed, 0 files unresolved $ mkcommit c_aL0 created new head $ mkcommit c_aM0 --close-branch $ hg push -f pushing to $TESTTMP/single-head-server searching for changes adding changesets adding manifests adding file changes transaction abort! rollback completed abort: rejecting multiple heads on branch "branch_A" (3 heads: 49003e504178 5254bcccab93 42b9fe70a3c1) [255] Test that config can be overriden as the boolean it is ------------------------------------------------------ $ cat <<EOF >> $TESTTMP/single-head-server/.hg/hgrc > [experimental] > single-head-per-branch = no > EOF Because of previous test, we'll also push c_aL0 and c_aM0. $ hg out -T "{desc}\n" comparing with $TESTTMP/single-head-server searching for changes c_aL0 c_aM0 Let's make a new head and push everythin. The server feedback will mention exactly one new head because c_aM0 is closed. $ hg up 'desc("c_aG0")' 0 files updated, 0 files merged, 2 files removed, 0 files unresolved $ mkcommit c_aN0 created new head $ hg push -f pushing to $TESTTMP/single-head-server searching for changes adding changesets adding manifests adding file changes added 3 changesets with 3 changes to 3 files (+1 heads)