From eb538fe4426b87938f3150cd6421a91b96887b6f Mon Sep 17 00:00:00 2001
From: Matthew Sackman <matthew@rabbitmq.com>
Date: Wed, 30 Jun 2010 11:46:59 +0100
Subject: As predicted, changing this from sets:from_list/sets:fold to
 lists:usort/lists:foldl has a decent performance improvement, moving from
 being able to sustain 8kHz on a topic exchang to 8.5kHz on a topic exchange

---
 src/rabbit_router.erl | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/rabbit_router.erl b/src/rabbit_router.erl
index 5cd15a94..75196bc0 100644
--- a/src/rabbit_router.erl
+++ b/src/rabbit_router.erl
@@ -90,13 +90,13 @@ match_routing_key(Name, RoutingKey) ->
     lookup_qpids(mnesia:dirty_select(rabbit_route, [{MatchHead, [], ['$1']}])).
 
 lookup_qpids(Queues) ->
-    sets:fold(
+    lists:foldl(
       fun (Key, Acc) ->
               case mnesia:dirty_read({rabbit_queue, Key}) of
                   [#amqqueue{pid = QPid}] -> [QPid | Acc];
                   []                      -> Acc
               end
-      end, [], sets:from_list(Queues)).
+      end, [], lists:usort(Queues)).
 
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