changeset 49014:5a24bb7f4ed7

subsetmaker: use SortedSet for the scratch variant This provides a massive speedup on wide repository with many heads. For example on mozilla-try, this move from un-usable slow to fairly instant. Differential Revision: https://phab.mercurial-scm.org/D12395
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Sun, 13 Mar 2022 16:24:01 +0100
parents 186223795e4a
children 3f6ddb1c193b
files contrib/perf-utils/subsetmaker.py
diffstat 1 files changed, 6 insertions(+), 4 deletions(-) [+]
line wrap: on
line diff
--- a/contrib/perf-utils/subsetmaker.py	Sun Mar 13 15:53:29 2022 +0100
+++ b/contrib/perf-utils/subsetmaker.py	Sun Mar 13 16:24:01 2022 +0100
@@ -15,6 +15,10 @@
     smartset,
 )
 
+import sortedcontainers
+
+SortedSet = sortedcontainers.SortedSet
+
 revsetpredicate = registrar.revsetpredicate()
 
 
@@ -78,7 +82,7 @@
     n = revsetlang.getinteger(n, _(b"scratch expects a number"))
 
     selected = set()
-    heads = set()
+    heads = SortedSet()
     children_count = collections.defaultdict(lambda: 0)
     parents = repo.changelog._uncheckedparentrevs
 
@@ -102,9 +106,7 @@
     for x in range(n):
         if not heads:
             break
-        pickable = list(heads)
-        pickable.sort()
-        pick = rand.choice(pickable)
+        pick = rand.choice(heads)
         heads.remove(pick)
         assert pick not in selected
         selected.add(pick)