Mercurial > hg
view tests/test-newbranch.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 | 8197b395710e |
children | 8d72e29ad1e0 |
line wrap: on
line source
$ branchcache=.hg/cache/branch2 $ listbranchcaches() { > for f in .hg/cache/branch2*; > do echo === $f ===; > cat $f; > done; > } $ purgebranchcaches() { > rm .hg/cache/branch2* > } $ hg init t $ cd t $ hg branches $ echo foo > a $ hg add a $ hg ci -m "initial" $ hg branch foo marked working directory as branch foo (branches are permanent and global, did you want a bookmark?) $ hg branch foo $ hg ci -m "add branch name" $ hg branch bar marked working directory as branch bar $ hg ci -m "change branch name" Branch shadowing: $ hg branch default abort: a branch of the same name already exists (use 'hg update' to switch to it) [255] $ hg branch -f default marked working directory as branch default $ hg ci -m "clear branch name" created new head There should be only one default branch head $ hg heads . changeset: 3:1c28f494dae6 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: clear branch name Merging and branches $ hg co foo 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg branch foo set existing branch name fails unless force - setting existing parent branch works without force: $ hg branch bar abort: a branch of the same name already exists (use 'hg update' to switch to it) [255] $ hg branch -f bar marked working directory as branch bar $ hg branch foo marked working directory as branch foo $ echo bleah > a $ hg ci -m "modify a branch" $ hg merge default 0 files updated, 0 files merged, 0 files removed, 0 files unresolved (branch merge, don't forget to commit) $ hg branch foo set existing branch name where branch head is ancestor: $ hg branch bar abort: a branch of the same name already exists (use 'hg update' to switch to it) [255] set (other) parent branch as branch name $ hg branch default marked working directory as branch default set (first) parent branch as branch name $ hg branch foo marked working directory as branch foo $ hg ci -m "merge" $ hg log -G -T '{rev}:{node|short} {branch} {desc}\n' @ 5:530046499edf foo merge |\ | o 4:adf1a74a7f7b foo modify a branch | | o | 3:1c28f494dae6 default clear branch name | | o | 2:c21617b13b22 bar change branch name |/ o 1:6c0e42da283a foo add branch name | o 0:db01e8ea3388 default initial $ hg branches foo 5:530046499edf default 3:1c28f494dae6 (inactive) bar 2:c21617b13b22 (inactive) $ hg branches -q foo default bar Test for invalid branch cache: $ hg rollback repository tip rolled back to revision 4 (undo commit) working directory now based on revisions 4 and 3 $ cp ${branchcache}-served .hg/bc-invalid $ hg log -r foo changeset: 4:adf1a74a7f7b branch: foo tag: tip parent: 1:6c0e42da283a user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: modify a branch $ cp .hg/bc-invalid $branchcache $ hg --debug log -r foo changeset: 4:adf1a74a7f7b4cd193d12992f5d0d6a004ed21d6 branch: foo tag: tip phase: draft parent: 1:6c0e42da283a56b5edc5b4fadb491365ec7f5fa8 parent: -1:0000000000000000000000000000000000000000 manifest: 1:8c342a37dfba0b3d3ce073562a00d8a813c54ffe user: test date: Thu Jan 01 00:00:00 1970 +0000 files: a extra: branch=foo description: modify a branch $ purgebranchcaches $ echo corrupted > $branchcache $ hg log -qr foo 4:adf1a74a7f7b $ listbranchcaches === .hg/cache/branch2 === corrupted === .hg/cache/branch2-served === adf1a74a7f7b4cd193d12992f5d0d6a004ed21d6 4 c21617b13b220988e7a2e26290fbe4325ffa7139 o bar 1c28f494dae69a2f8fc815059d257eccf3fcfe75 o default adf1a74a7f7b4cd193d12992f5d0d6a004ed21d6 o foo Push should update the branch cache: $ hg init ../target Pushing just rev 0: $ hg push -qr 0 ../target $ (cd ../target/; listbranchcaches) === .hg/cache/branch2-base === db01e8ea3388fd3c7c94e1436ea2bd6a53d581c5 0 db01e8ea3388fd3c7c94e1436ea2bd6a53d581c5 o default Pushing everything: $ hg push -qf ../target $ (cd ../target/; listbranchcaches) === .hg/cache/branch2-base === adf1a74a7f7b4cd193d12992f5d0d6a004ed21d6 4 c21617b13b220988e7a2e26290fbe4325ffa7139 o bar 1c28f494dae69a2f8fc815059d257eccf3fcfe75 o default adf1a74a7f7b4cd193d12992f5d0d6a004ed21d6 o foo Update with no arguments: tipmost revision of the current branch: $ hg up -q -C 0 $ hg up -q $ hg id 1c28f494dae6 $ hg up -q 1 $ hg up -q $ hg id adf1a74a7f7b (foo) tip $ hg branch foobar marked working directory as branch foobar $ hg up 0 files updated, 0 files merged, 0 files removed, 0 files unresolved Fast-forward merge: $ hg branch ff marked working directory as branch ff $ echo ff > ff $ hg ci -Am'fast forward' adding ff $ hg up foo 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ hg merge ff 1 files updated, 0 files merged, 0 files removed, 0 files unresolved (branch merge, don't forget to commit) $ hg branch foo $ hg commit -m'Merge ff into foo' $ hg parents changeset: 6:185ffbfefa30 branch: foo tag: tip parent: 4:adf1a74a7f7b parent: 5:1a3c27dc5e11 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: Merge ff into foo $ hg manifest a ff Test merging, add 3 default heads and one test head: $ cd .. $ hg init merges $ cd merges $ echo a > a $ hg ci -Ama adding a $ echo b > b $ hg ci -Amb adding b $ hg up 0 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ echo c > c $ hg ci -Amc adding c created new head $ hg up 0 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ echo d > d $ hg ci -Amd adding d created new head $ hg up 0 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ hg branch test marked working directory as branch test (branches are permanent and global, did you want a bookmark?) $ echo e >> e $ hg ci -Ame adding e $ hg log changeset: 4:3a1e01ed1df4 branch: test tag: tip parent: 0:cb9a9f314b8b user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: e changeset: 3:980f7dc84c29 parent: 0:cb9a9f314b8b user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: d changeset: 2:d36c0562f908 parent: 0:cb9a9f314b8b user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: c changeset: 1:d2ae7f538514 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: b changeset: 0:cb9a9f314b8b user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: a Implicit merge with test branch as parent: $ hg merge abort: branch 'test' has one head - please merge with an explicit rev (run 'hg heads' to see all heads, specify rev with -r) [255] $ hg up -C default 1 files updated, 0 files merged, 1 files removed, 0 files unresolved Implicit merge with default branch as parent: $ hg merge abort: branch 'default' has 3 heads - please merge with an explicit rev (run 'hg heads .' to see heads, specify rev with -r) [255] 3 branch heads, explicit merge required: $ hg merge 2 1 files updated, 0 files merged, 0 files removed, 0 files unresolved (branch merge, don't forget to commit) $ hg ci -m merge 2 branch heads, implicit merge works: $ hg merge 1 files updated, 0 files merged, 0 files removed, 0 files unresolved (branch merge, don't forget to commit) $ cd .. We expect that bare update on new branch, updates to parent $ hg init bareupdateonnewbranch $ cd bareupdateonnewbranch $ hg update 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ touch a $ hg commit -A -m "a" adding a $ touch b $ hg commit -A -m "b" adding b $ touch c $ hg commit -A -m "c" adding c $ hg update -r 1 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ hg log -G o changeset: 2:991a3460af53 | tag: tip | user: test | date: Thu Jan 01 00:00:00 1970 +0000 | summary: c | @ changeset: 1:0e067c57feba | user: test | date: Thu Jan 01 00:00:00 1970 +0000 | summary: b | o changeset: 0:3903775176ed user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: a $ hg branch dev marked working directory as branch dev (branches are permanent and global, did you want a bookmark?) $ hg update 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg summary parent: 1:0e067c57feba b branch: dev commit: (new branch) update: (current) phases: 3 draft $ cd .. We need special handling for repositories with no "default" branch because "null" revision belongs to non-existent "default" branch. $ hg init nodefault $ cd nodefault $ hg branch -q foo $ touch 0 $ hg ci -Aqm0 $ touch 1 $ hg ci -Aqm1 $ hg update -qr0 $ hg branch -q bar $ touch 2 $ hg ci -Aqm2 $ hg update -qr0 $ hg branch -q baz $ touch 3 $ hg ci -Aqm3 $ hg ci --close-branch -m 'close baz' $ hg update -q null $ hg log -GT'{rev} {branch}\n' _ 4 baz | o 3 baz | | o 2 bar |/ | o 1 foo |/ o 0 foo a) updating from "null" should bring us to the tip-most branch head as there is no "default" branch: $ hg update -q null $ hg id -bn -1 default $ hg update 2 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg id -bn 2 bar b) but if we are at uncommitted "default" branch, we should stick to the current revision: $ hg update -q 0 $ hg branch default marked working directory as branch default $ hg id -bn 0 default $ hg update 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg id -bn 0 default c) also, if we have uncommitted branch at "null", we should stick to it: $ hg update -q null $ hg branch new marked working directory as branch new $ hg id -bn -1 new $ hg update 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg id -bn -1 new $ cd .. We expect that update --clean discard changes in working directory, and updates to the head of parent branch. $ hg init updatebareclean $ cd updatebareclean $ hg update --clean 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ touch a $ hg commit -A -m "a" adding a $ touch b $ hg commit -A -m "b" adding b $ touch c $ hg commit -A -m "c" adding c $ hg log changeset: 2:991a3460af53 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: c changeset: 1:0e067c57feba user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: b changeset: 0:3903775176ed user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: a $ hg update -r 1 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ hg branch new-branch marked working directory as branch new-branch (branches are permanent and global, did you want a bookmark?) $ echo "aa" >> a $ hg update --clean 2 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg status $ hg branch default $ hg parent changeset: 2:991a3460af53 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: c We expect that update --clean on non existing parent discards a new branch and updates to the tipmost non-closed branch head $ hg update null 0 files updated, 0 files merged, 3 files removed, 0 files unresolved $ hg branch newbranch marked working directory as branch newbranch (branches are permanent and global, did you want a bookmark?) $ hg update -C 3 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg summary parent: 2:991a3460af53 tip c branch: default commit: (clean) update: (current) phases: 3 draft