# HG changeset patch
# User Boris Feld <boris.f...@octobus.net>
# Date 1541687398 -3600
# Thu Nov 08 15:29:58 2018 +0100
# Node ID 3bdd984df153304a956d31d2f3fbc3cd7f0e41c2
# Parent c8eba56f115019badd26223e504ca4899210075a
# EXP-Topic sparse-perf
# Available At https://bitbucket.org/octobus/mercurial-devel/
# hg pull https://bitbucket.org/octobus/mercurial-devel/ -r
3bdd984df153
sparse-revlog: fast-path before computing payload size
In this fast-path case, we do not need to compute the full delta chain
payload. Since it comes with a significant cost, we avoid doing so if
possible.
diff --git a/mercurial/revlogutils/deltas.py b/mercurial/revlogutils/deltas.py
--- a/mercurial/revlogutils/deltas.py
+++ b/mercurial/revlogutils/deltas.py
@@ -257,13 +257,13 @@ def _slicechunktodensity(revlog, revs, t
return
deltachainspan = segmentspan(revlog, revs)
- chainpayload = sum(length(r) for r in revs)
if deltachainspan < mingapsize:
yield revs
return
readdata = deltachainspan
+ chainpayload = sum(length(r) for r in revs)
if deltachainspan:
density = chainpayload / float(deltachainspan)
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