Make patch.diff filelog cache LRU of 20 files. Fixes issue1738.
20 files is as fast as 200 for hg diff -r 28015:30103 of mozilla-central.
Ideally we'd use util.lrucachefunc, but the interface doesn't quite work.
--- a/mercurial/patch.py Tue Jul 14 17:12:12 2009 -0300
+++ b/mercurial/patch.py Tue Jul 14 16:50:37 2009 -0700
@@ -1246,12 +1246,21 @@
if not node1:
node1 = repo.dirstate.parents()[0]
- flcache = {}
- def getfilectx(f, ctx):
- flctx = ctx.filectx(f, filelog=flcache.get(f))
- if f not in flcache:
- flcache[f] = flctx._filelog
- return flctx
+ def lrugetfilectx():
+ cache = {}
+ order = []
+ def getfilectx(f, ctx):
+ fctx = ctx.filectx(f, filelog=cache.get(f))
+ if f not in cache:
+ if len(cache) > 20:
+ del cache[order.pop(0)]
+ cache[f] = fctx._filelog
+ else:
+ order.remove(f)
+ order.append(f)
+ return fctx
+ return getfilectx
+ getfilectx = lrugetfilectx()
ctx1 = repo[node1]
ctx2 = repo[node2]