Performance testing RabbitMQ LDAP plugin

gistfile1.txt

I applied this patch to the server:

diff --git a/src/rabbit_access_control.erl b/src/rabbit_access_control.erl
index 41c54b0..a0feb33 100644
--- a/src/rabbit_access_control.erl
+++ b/src/rabbit_access_control.erl
@@ -136,9 +136,16 @@ check_vhost_access(User = #user{username       = Username,
       fun({Mod, Impl}, ok) ->
               check_access(
                 fun() ->
-                        rabbit_vhost:exists(VHostPath) andalso
-                            Mod:check_vhost_access(
-                              auth_user(User, Impl), VHostPath, Sock)
+                        Count = 100,
+                        {T, [R|_]} =
+                            timer:tc(fun() ->
+                                             [Mod:check_vhost_access(
+                                                auth_user(User, Impl),
+                                                VHostPath, Sock) ||
+                                                 _ <- lists:seq(1, Count)]
+                                     end),
+                        io:format("Vhost check took ~pus~n", [T / Count]),
+                        rabbit_vhost:exists(VHostPath) andalso R
                 end,
                 Mod, "access to vhost '~s' refused for user '~s'",

which runs each vhost access query 100 times, and prints the average time taken in microseconds.

I then did:

$ sudo tc qdisc add dev lo root handle 1:0 netem delay 10msec

to impose a 10ms latency on localhost (where my LDAP server is), then just ran PerfTest to see the timings.

To remove the localhost latency, do:

$ sudo tc qdisc del dev lo root