Add an example for benching counters

Author: russelldb

examples/counters.config

@@ -0,0 +1,34 @@
+{mode, max}.
+
+{duration, 5}.
+
+{concurrent, 1}.
+
+{driver, basho_bench_driver_riakc_pb}.
+
+{key_generator, {int_to_bin, {uniform_int, 10000}}}.
+
+{value_generator, {random_int, 50}}.
+
+{riakc_pb_ips, [{127,0,0,1}]}.
+
+{riakc_pb_replies, 2}.
+
+{operations, [{counter_incr, 100}, {counter_val, 1}]}.
+
+%% Use {auto_reconnect, false} to get "old" behavior (prior to April 2013).
+%% See deps/riakc/src/riakc_pb_socket.erl for all valid socket options.
+{pb_connect_options, [{auto_reconnect, true}]}.
+
+%% Overrides for the PB client's default 60 second timeout, on a
+%% per-type-of-operation basis.  All timeout units are specified in
+%% milliseconds.  The pb_timeout_general config item provides a
+%% default timeout if the read/write/listkeys/mapreduce timeout is not
+%% specified.
+
+{pb_timeout_general, 30000}.
+{pb_timeout_read, 5000}.
+{pb_timeout_write, 5000}.
+{pb_timeout_listkeys, 50000}.
+%% The general timeout will be used because this specific item is commented:
+%% {pb_timeout_mapreduce, 50000}.