perf: add --reverse to perfrevlog
It can be useful to know how fast we can read revisions from a revlog
in reverse. This operation tends to occur in `hg log` commands,
for example.
--- a/contrib/perf.py Sat Sep 24 19:58:23 2016 +0900
+++ b/contrib/perf.py Sat Sep 24 10:44:37 2016 -0700
@@ -580,9 +580,10 @@
@command('perfrevlog', revlogopts + formatteropts +
[('d', 'dist', 100, 'distance between the revisions'),
- ('s', 'startrev', 0, 'revision to start reading at')],
+ ('s', 'startrev', 0, 'revision to start reading at'),
+ ('', 'reverse', False, 'read in reverse')],
'-c|-m|FILE')
-def perfrevlog(ui, repo, file_=None, startrev=0, **opts):
+def perfrevlog(ui, repo, file_=None, startrev=0, reverse=False, **opts):
"""Benchmark reading a series of revisions from a revlog.
By default, we read every ``-d/--dist`` revision from 0 to tip of
@@ -591,11 +592,20 @@
The start revision can be defined via ``-s/--startrev``.
"""
timer, fm = gettimer(ui, opts)
- dist = opts['dist']
_len = getlen(ui)
+
def d():
r = cmdutil.openrevlog(repo, 'perfrevlog', file_, opts)
- for x in xrange(startrev, _len(r), dist):
+
+ startrev = 0
+ endrev = _len(r)
+ dist = opts['dist']
+
+ if reverse:
+ startrev, endrev = endrev, startrev
+ dist = -1 * dist
+
+ for x in xrange(startrev, endrev, dist):
r.revision(r.node(x))
timer(d)