debugcommands: introduce actions to perform deterministic reads
"readavailable" is useful as a debugging device to see what data is
available on a pipe. But the mechanism isn't deterministic because
what's available on a pipe is highly conditional on timing, system
load, OS behavior, etc. This makes it not suitable for tests.
We introduce "ereadline," "read," and "eread" for performing
deterministic I/O operations (at least on blocking file descriptors).
We stop short of converting existing consumers of "readavailable"
in tests because we're working out race conditions and deadlocks
on Windows. But the goal is to eventually move tests away from
"readavailable" to these new APIs.
Differential Revision: https://phab.mercurial-scm.org/D2720
#require test-repo
Set vars:
$ . "$TESTDIR/helpers-testrepo.sh"
$ CONTRIBDIR="$TESTDIR/../contrib"
Prepare repo:
$ hg init
$ echo this is file a > a
$ hg add a
$ hg commit -m first
$ echo adding to file a >> a
$ hg commit -m second
$ echo adding more to file a >> a
$ hg commit -m third
$ hg up -r 0
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo merge-this >> a
$ hg commit -m merge-able
created new head
$ hg up -r 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
perfstatus
$ cat >> $HGRCPATH << EOF
> [extensions]
> perfstatusext=$CONTRIBDIR/perf.py
> [perf]
> presleep=0
> stub=on
> parentscount=1
> EOF
$ hg help perfstatusext
perfstatusext extension - helper extension to measure performance
list of commands:
perfaddremove
(no help text available)
perfancestors
(no help text available)
perfancestorset
(no help text available)
perfannotate (no help text available)
perfbdiff benchmark a bdiff between revisions
perfbookmarks
benchmark parsing bookmarks from disk to memory
perfbranchmap
benchmark the update of a branchmap
perfbundleread
Benchmark reading of bundle files.
perfcca (no help text available)
perfchangegroupchangelog
Benchmark producing a changelog group for a changegroup.
perfchangeset
(no help text available)
perfctxfiles (no help text available)
perfdiffwd Profile diff of working directory changes
perfdirfoldmap
(no help text available)
perfdirs (no help text available)
perfdirstate (no help text available)
perfdirstatedirs
(no help text available)
perfdirstatefoldmap
(no help text available)
perfdirstatewrite
(no help text available)
perffncacheencode
(no help text available)
perffncacheload
(no help text available)
perffncachewrite
(no help text available)
perfheads (no help text available)
perfindex (no help text available)
perfloadmarkers
benchmark the time to parse the on-disk markers for a repo
perflog (no help text available)
perflookup (no help text available)
perflrucachedict
(no help text available)
perfmanifest (no help text available)
perfmergecalculate
(no help text available)
perfmoonwalk benchmark walking the changelog backwards
perfnodelookup
(no help text available)
perfparents (no help text available)
perfpathcopies
(no help text available)
perfphases benchmark phasesets computation
perfrawfiles (no help text available)
perfrevlogchunks
Benchmark operations on revlog chunks.
perfrevlogindex
Benchmark operations against a revlog index.
perfrevlogrevision
Benchmark obtaining a revlog revision.
perfrevlogrevisions
Benchmark reading a series of revisions from a revlog.
perfrevrange (no help text available)
perfrevset benchmark the execution time of a revset
perfstartup (no help text available)
perfstatus (no help text available)
perftags (no help text available)
perftemplating
(no help text available)
perfunidiff benchmark a unified diff between revisions
perfvolatilesets
benchmark the computation of various volatile set
perfwalk (no help text available)
perfwrite microbenchmark ui.write
(use 'hg help -v perfstatusext' to show built-in aliases and global options)
$ hg perfaddremove
$ hg perfancestors
$ hg perfancestorset 2
$ hg perfannotate a
$ hg perfbdiff -c 1
$ hg perfbdiff --alldata 1
$ hg perfunidiff -c 1
$ hg perfunidiff --alldata 1
$ hg perfbookmarks
$ hg perfbranchmap
$ hg perfcca
$ hg perfchangegroupchangelog
$ hg perfchangeset 2
$ hg perfctxfiles 2
$ hg perfdiffwd
$ hg perfdirfoldmap
$ hg perfdirs
$ hg perfdirstate
$ hg perfdirstatedirs
$ hg perfdirstatefoldmap
$ hg perfdirstatewrite
$ hg perffncacheencode
$ hg perffncacheload
$ hg perffncachewrite
$ hg perfheads
$ hg perfindex
$ hg perfloadmarkers
$ hg perflog
$ hg perflookup 2
$ hg perflrucache
$ hg perfmanifest 2
$ hg perfmergecalculate -r 3
$ hg perfmoonwalk
$ hg perfnodelookup 2
$ hg perfpathcopies 1 2
$ hg perfrawfiles 2
$ hg perfrevlogindex -c
$ hg perfrevlogrevisions .hg/store/data/a.i
$ hg perfrevlogrevision -m 0
$ hg perfrevlogchunks -c
$ hg perfrevrange
$ hg perfrevset 'all()'
$ hg perfstartup
$ hg perfstatus
$ hg perftags
$ hg perftemplating
$ hg perfvolatilesets
$ hg perfwalk
$ hg perfparents
Check perf.py for historical portability
$ cd "$TESTDIR/.."
$ (testrepohg files -r 1.2 glob:mercurial/*.c glob:mercurial/*.py;
> testrepohg files -r tip glob:mercurial/*.c glob:mercurial/*.py) |
> "$TESTDIR"/check-perf-code.py contrib/perf.py
contrib/perf.py:\d+: (re)
> from mercurial import (
import newer module separately in try clause for early Mercurial
[1]