Mercurial > hg
view tests/test-merge-combination.t @ 44386:8f7c6656ac79
rust-nodemap: pure Rust example
To run, use `cargo run --release --example nodemap`
This demonstrates that simple scenarios entirely written
in Rust can content themselves with `NodeTree<T>`.
The example mmaps both the nodemap file and the changelog index.
We had of course to include an implementation of `RevlogIndex`
directly, which isn't much at this stage. It felt a bit
prematurate to include it in the lib.
Here are some first performance measurements, obtained with
this example, on a clone of mozilla-central with 440000
changesets:
(create) Nodemap constructed in RAM in 153.638305ms
(query CAE63161B68962) found in 22.362us: Ok(Some(269489))
(bench) Did 3 queries in 36.418µs (mean 12.139µs)
(bench) Did 50 queries in 184.318µs (mean 3.686µs)
(bench) Did 100000 queries in 31.053461ms (mean 310ns)
To be fair, even between bench runs, results tend to depend whether
the file is still in kernel caches, and it's not so easy to
get back to a real cold start. The worst we've seen was in the
50us ballpark.
In any busy server setting, the pages would always be in RAM.
We hope it's good enough not to be significantly slower on any
concrete Mercurial operation than the C nodetree when fully in RAM,
and of course this implementation has the serious headstart advantage
of persistence.
Differential Revision: https://phab.mercurial-scm.org/D7797
author | Georges Racinet <georges.racinet@octobus.net> |
---|---|
date | Tue, 18 Feb 2020 19:11:15 +0100 |
parents | 302dbc9d52be |
children | 8045e4aa366b |
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This file shows what hg says are "modified" files for a merge commit (hg log -T {files}), somewhat exhaustively. It shows merges that involves files contents changing, and merges that involve executable bit changing, but not merges with multiple or zero merge ancestors, nor copies/renames, and nor identical file contents with different filelog revisions. genmerges is the workhorse. Given: - a range function describing the possible values for file a - a isgood function to filter out uninteresting combination - a createfile function to actually write the values for file a on the filesystem it print a series of lines that look like: abcd C: output of -T {files} describing the file a at respectively the base, p2, p1, merge revision. "C" indicates that hg merge had conflicts. $ genmerges () { > for base in `range` -; do > for r1 in `range $base` -; do > for r2 in `range $base $r1` -; do > for m in `range $base $r1 $r2` -; do > line="$base$r1$r2$m" > isgood $line || continue > hg init repo > cd repo > make_commit () { > v=$1; msg=$2; file=$3; > if [ $v != - ]; then > createfile $v > else > if [ -f a ] > then rm a > else touch $file > fi > fi > hg commit -q -Am $msg || exit 123 > } > echo foo > foo > make_commit $base base b > make_commit $r1 r1 c > hg up -r 0 -q > make_commit $r2 r2 d > hg merge -q -r 1 > ../output 2>&1 > if [ $? -ne 0 ]; then rm -f *.orig; hg resolve -m --all -q; fi > if [ -s ../output ]; then conflicts=" C"; else conflicts=" "; fi > make_commit $m m e > if [ $m = $r1 ] && [ $m = $r2 ] > then expected= > elif [ $m = $r1 ] > then if [ $base = $r2 ] > then expected= > else expected=a > fi > elif [ $m = $r2 ] > then if [ $base = $r1 ] > then expected= > else expected=a > fi > else expected=a > fi > got=`hg log -r 3 --template '{files}\n' | tr -d 'e '` > if [ "$got" = "$expected" ] > then echo "$line$conflicts: agree on \"$got\"" > else echo "$line$conflicts: hg said \"$got\", expected \"$expected\"" > fi > cd ../ > rm -rf repo > done > done > done > done > } All the merges of various file contents. $ range () { > max=0 > for i in $@; do > if [ $i = - ]; then continue; fi > if [ $i -gt $max ]; then max=$i; fi > done > $TESTDIR/seq.py `expr $max + 1` > } $ isgood () { true; } $ createfile () { > if [ -f a ] && [ "`cat a`" = $1 ] > then touch $file > else echo $v > a > fi > } $ genmerges 1111 : agree on "" 1112 : agree on "a" 111- : agree on "a" 1121 : agree on "a" 1122 : agree on "" 1123 : agree on "a" 112- : agree on "a" 11-1 : hg said "", expected "a" 11-2 : agree on "a" 11-- : agree on "" 1211 : agree on "a" 1212 : agree on "" 1213 : agree on "a" 121- : agree on "a" 1221 : agree on "a" 1222 : agree on "" 1223 : agree on "a" 122- : agree on "a" 1231 C: agree on "a" 1232 C: agree on "a" 1233 C: agree on "a" 1234 C: agree on "a" 123- C: agree on "a" 12-1 C: agree on "a" 12-2 C: hg said "", expected "a" 12-3 C: agree on "a" 12-- C: agree on "a" 1-11 : hg said "", expected "a" 1-12 : agree on "a" 1-1- : agree on "" 1-21 C: agree on "a" 1-22 C: hg said "", expected "a" 1-23 C: agree on "a" 1-2- C: agree on "a" 1--1 : agree on "a" 1--2 : agree on "a" 1--- : agree on "" -111 : agree on "" -112 : agree on "a" -11- : agree on "a" -121 C: agree on "a" -122 C: agree on "a" -123 C: agree on "a" -12- C: agree on "a" -1-1 : agree on "" -1-2 : agree on "a" -1-- : agree on "a" --11 : agree on "" --12 : agree on "a" --1- : agree on "a" ---1 : agree on "a" ---- : agree on "" All the merges of executable bit. $ range () { > max=a > for i in $@; do > if [ $i = - ]; then continue; fi > if [ $i > $max ]; then max=$i; fi > done > if [ $max = a ]; then echo f; else echo f x; fi > } $ isgood () { case $line in *f*x*) true;; *) false;; esac; } $ createfile () { > if [ -f a ] && (([ -x a ] && [ $v = x ]) || (! [ -x a ] && [ $v != x ])) > then touch $file > else touch a; if [ $v = x ]; then chmod +x a; else chmod -x a; fi > fi > } #if execbit $ genmerges fffx : agree on "a" ffxf : agree on "a" ffxx : agree on "" ffx- : agree on "a" ff-x : hg said "", expected "a" fxff : hg said "", expected "a" fxfx : hg said "a", expected "" fxf- : agree on "a" fxxf : agree on "a" fxxx : agree on "" fxx- : agree on "a" fx-f : hg said "", expected "a" fx-x : hg said "", expected "a" fx-- : hg said "", expected "a" f-fx : agree on "a" f-xf : agree on "a" f-xx : hg said "", expected "a" f-x- : agree on "a" f--x : agree on "a" -ffx : agree on "a" -fxf C: agree on "a" -fxx C: hg said "", expected "a" -fx- C: agree on "a" -f-x : hg said "", expected "a" --fx : agree on "a" #endif Files modified or cleanly merged, with no greatest common ancestors: $ hg init repo; cd repo $ touch a0 b0; hg commit -qAm 0 $ hg up -qr null; touch a1 b1; hg commit -qAm 1 $ hg merge -qr 0; rm b*; hg commit -qAm 2 $ hg log -r . -T '{files}\n' b0 b1 $ cd ../ $ rm -rf repo A few cases of criss-cross merges involving deletions (listing all such merges is probably too much). Both gcas contain $files, so we expect the final merge to behave like a merge with a single gca containing $files. $ hg init repo; cd repo $ files="c1 u1 c2 u2" $ touch $files; hg commit -qAm '0 root' $ for f in $files; do echo f > $f; done; hg commit -qAm '1 gca1' $ hg up -qr0; hg revert -qr 1 --all; hg commit -qAm '2 gca2' $ hg up -qr 1; hg merge -qr 2; rm *1; hg commit -qAm '3 p1' $ hg up -qr 2; hg merge -qr 1; rm *2; hg commit -qAm '4 p2' $ hg merge -qr 3; echo f > u1; echo f > u2; rm -f c1 c2 $ hg commit -qAm '5 merge with two gcas' $ hg log -r . -T '{files}\n' # expecting u1 u2 $ cd ../ $ rm -rf repo