perf: add perfmoonwalk command to walk the changelog backwards
This lets us test the effectiveness (or ineffectiveness) of the revlog chunk
cache when walking revlogs backwards.
--- a/contrib/perf.py Tue Dec 03 13:28:04 2013 -0500
+++ b/contrib/perf.py Sun Nov 17 18:04:28 2013 -0500
@@ -243,6 +243,18 @@
copies=opts.get('rename')))
ui.popbuffer()
+@command('perfmoonwalk')
+def perfmoonwalk(ui, repo):
+ """benchmark walking the changelog backwards
+
+ This also loads the changelog data for each revision in the changelog.
+ """
+ def moonwalk():
+ for i in xrange(len(repo), -1, -1):
+ ctx = repo[i]
+ ctx.branch() # read changelog data (in addition to the index)
+ timer(moonwalk)
+
@command('perftemplating')
def perftemplating(ui, repo):
ui.pushbuffer()