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Created April 2, 2012 21:34
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fprof PB search/mapred
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gistfile1.md

Get conn

{ok, Pid} = riakc_pb_socket:start_link("127.0.0.1", 8081).

Set variables

Bucket = <<"spam">>.
Query = <<"Scott">>.
Phases = [ {reduce,{modfun, riak_kv_mapreduce, reduce_identity},[{reduce_phase_only_1, true}],true} ].

Get the pid of the PB Server.

ServerPid = element(2,hd(supervisor:which_children(riak_kv_pb_socket_sup))).

Jot down the value of Pid and ServerPid on a piece of paper. Invoke frpof and send results to pb.analysis

fprof:apply(riakc_pb_socket, mapred, [Pid, Input, Phases], [{procs, [Pid, ServerPid]}]).
fprof:profile().
fprof:analyse([{dest, "pb.analysis"}]).

Open pb.analysis with favorite editor. Refer to your Pid & ServerPid values to determine where time is being spent.

http://www.erlang.org/doc/man/fprof.html

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