perf: clear vfs audit_cache before each run
When generating a stream clone, we spend a large amount of time auditing path.
Before this changes, the first run was warming the vfs cache for the other
runs, leading to a large runtime difference and a "faulty" reported timing for
the operation.
We now clear this important cache between run to get a more realistic timing.
Below are some example of median time change when clearing these cases. The
maximum time for a run did not changed significantly.
### data-env-vars.name = mozilla-central-2018-08-01-zstd-sparse-revlog
# benchmark.name = hg.perf.exchange.stream.generate
# bin-env-vars.hg.flavor = default
# bin-env-vars.hg.py-re2-module = default
# benchmark.variants.version = latest
no-clearing: 17.289905
cache-clearing: 21.587965 (+24.86%, +4.30)
## data-env-vars.name = mozilla-central-2024-03-22-zstd-sparse-revlog
no-clearing: 32.670748
cache-clearing: 40.467095 (+23.86%, +7.80)
## data-env-vars.name = mozilla-try-2019-02-18-zstd-sparse-revlog
no-clearing: 37.838858
cache-clearing: 46.072749 (+21.76%, +8.23)
## data-env-vars.name = mozilla-unified-2024-03-22-zstd-sparse-revlog
no-clearing: 32.969395
cache-clearing: 39.646209 (+20.25%, +6.68)
In addition, this significantly reduce the timing difference between the
performance command, from the perf extensions and a `real `hg bundle` call
producing a stream bundle. Some significant differences remain especially on
the "mozilla-try" repositories, but they are now smaller.
Note that some of that difference will actually not be
attributable to the stream generation (like maybe phases or branch map
computation).
Below are some benchmarks done on a currently draft changeset fixing some
unrelated slowness in `hg bundle` (34a78972af409d1ff37c29e60f6ca811ad1a457d)
### data-env-vars.name = mozilla-central-2018-08-01-zstd-sparse-revlog
# bin-env-vars.hg.flavor = default
# bin-env-vars.hg.py-re2-module = default
hg.perf.exchange.stream.generate: 21.587965
hg.command.bundle: 24.301799 (+12.57%, +2.71)
## data-env-vars.name = mozilla-central-2024-03-22-zstd-sparse-revlog
hg.perf.exchange.stream.generate: 40.467095
hg.command.bundle: 44.831317 (+10.78%, +4.36)
## data-env-vars.name = mozilla-unified-2024-03-22-zstd-sparse-revlog
hg.perf.exchange.stream.generate: 39.646209
hg.command.bundle: 45.395258 (+14.50%, +5.75)
## data-env-vars.name = mozilla-try-2019-02-18-zstd-sparse-revlog
hg.perf.exchange.stream.generate: 46.072749
hg.command.bundle: 55.882608 (+21.29%, +9.81)
## data-env-vars.name = mozilla-try-2023-03-22-zlib-general-delta
hg.perf.exchange.stream.generate: 334.716708
hg.command.bundle: 377.856767 (+12.89%, +43.14)
## data-env-vars.name = mozilla-try-2023-03-22-zstd-sparse-revlog
hg.perf.exchange.stream.generate: 302.972301
hg.command.bundle: 326.098755 (+7.63%, +23.13)
test merging things outside of the sparse checkout
$ hg init myrepo
$ cd myrepo
$ cat > .hg/hgrc <<EOF
> [extensions]
> sparse=
> EOF
$ echo foo > foo
$ echo bar > bar
$ hg add foo bar
$ hg commit -m initial
$ hg branch feature
marked working directory as branch feature
(branches are permanent and global, did you want a bookmark?)
$ echo bar2 >> bar
$ hg commit -m 'feature - bar2'
$ hg update -q default
$ hg debugsparse --exclude 'bar**'
$ hg merge feature
temporarily included 1 file(s) in the sparse checkout for merging
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
Verify bar was merged temporarily
$ ls -A
.hg
bar
foo
$ hg status
M bar
Verify bar disappears automatically when the working copy becomes clean
$ hg commit -m "merged"
cleaned up 1 temporarily added file(s) from the sparse checkout
$ hg status
$ ls -A
.hg
foo
$ hg cat -r . bar
bar
bar2
Test merging things outside of the sparse checkout that are not in the working
copy
$ hg strip -q -r . --config extensions.strip=
$ hg up -q feature
$ touch branchonly
$ hg ci -Aqm 'add branchonly'
$ hg up -q default
$ hg debugsparse -X branchonly
$ hg merge feature
temporarily included 2 file(s) in the sparse checkout for merging
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ cd ..
Tests merging a file which is modified in one branch and deleted in another and
file is excluded from sparse checkout
$ hg init ytest
$ cd ytest
$ echo "syntax: glob" >> .hgignore
$ echo "*.orig" >> .hgignore
$ hg ci -Aqm "added .hgignore"
$ for ch in a d; do echo foo > $ch; hg ci -Aqm "added "$ch; done;
$ cat >> .hg/hgrc <<EOF
> [alias]
> glog = log -GT "{rev}:{node|short} {desc}"
> [extensions]
> sparse =
> EOF
$ hg glog
@ 2:f29feff37cfc added d
|
o 1:617125d27d6b added a
|
o 0:53f3774ed939 added .hgignore
$ hg rm d
$ hg ci -m "removed d"
$ hg up '.^'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg debugsparse --reset
$ echo bar >> d
$ hg ci -Am "added bar to d"
created new head
$ hg glog
@ 4:6527874a90e4 added bar to d
|
| o 3:372c8558de45 removed d
|/
o 2:f29feff37cfc added d
|
o 1:617125d27d6b added a
|
o 0:53f3774ed939 added .hgignore
$ hg debugsparse --exclude "d"
$ ls -A
.hg
.hgignore
a
$ hg merge
temporarily included 1 file(s) in the sparse checkout for merging
file 'd' was deleted in other [merge rev] but was modified in local [working copy].
You can use (c)hanged version, (d)elete, or leave (u)nresolved.
What do you want to do? u
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
[1]
$ cd ..
Testing merging of a file which is renamed+modified on one side and modified on
another
$ hg init mvtest
$ cd mvtest
$ echo "syntax: glob" >> .hgignore
$ echo "*.orig" >> .hgignore
$ hg ci -Aqm "added .hgignore"
$ for ch in a d; do echo foo > $ch; hg ci -Aqm "added "$ch; done;
$ cat >> .hg/hgrc <<EOF
> [alias]
> glog = log -GT "{rev}:{node|short} {desc}"
> [extensions]
> sparse =
> EOF
$ hg glog
@ 2:f29feff37cfc added d
|
o 1:617125d27d6b added a
|
o 0:53f3774ed939 added .hgignore
$ echo babar >> a
$ hg ci -m "added babar to a"
$ hg up '.^'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg mv a amove
$ hg ci -m "moved a to amove"
created new head
$ hg up 3
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ hg glog
o 4:5d1e85955f6d moved a to amove
|
| @ 3:a06e41a6c16c added babar to a
|/
o 2:f29feff37cfc added d
|
o 1:617125d27d6b added a
|
o 0:53f3774ed939 added .hgignore
$ hg debugsparse --exclude "a"
$ ls -A
.hg
.hgignore
d
$ hg merge
temporarily included 1 file(s) in the sparse checkout for merging
merging a and amove to amove
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg status --copies
M amove
a
R a
$ hg up -C 4
cleaned up 1 temporarily added file(s) from the sparse checkout
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg merge
merging amove and a to amove
abort: cannot add 'a' - it is outside the sparse checkout
(include file with `hg debugsparse --include <pattern>` or use `hg add -s <file>` to include file directory while adding)
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