(Sorry for breaking the thread, I just subscribed.)
I am experiencing very low performance as well. I'm attaching a small
benchmark script. Writing 32 KB chunks yields a much higher rate first,
then disk activity starts after about 4 seconds and throughput is
trashed to about 30-50 put/s. This is on a standard 60 MB/s 12ms
drive.
I've tested both innostore_riak and riak_kv_bitcask_backend. The
latter shows /slightly/ improved performance. What's odd is that there's
always a lot of data read, despite the script not reading data.
Are there any special Linux knobs or secret backend parameters?
Stephan
-module(riak_bench).
-export([run/1]).
-define(BUCKET, <<"benchmark">>).
-record(state, {last_print = make_timestamp(),
i = 0,
pending = 0,
threshold = 1,
done = 0, last_done = 0,
client,
doc = gen_doc(32 * 1024)}).
run(Threshold) ->
{ok, Client} = riak:client_connect('r...@127.0.0.1'),
loop(#state{client = Client,
threshold = Threshold}).
gen_doc(Size) ->
list_to_binary([<<(I rem 256)>>
|| I <- lists:seq(1, Size)]).
loop(#state{i = I,
pending = Pending,
threshold = Threshold,
client = Client,
doc = Doc} = State)
when Pending < Threshold ->
J = I + 1,
Caller = self(),
spawn_link(fun() ->
K = list_to_binary(io_lib:format("test-~B", [J])),
RObj = riak_object:new(?BUCKET, K, Doc),
ok = Client:put(RObj, 1, 1),
Caller ! done
end),
loop(State#state{i = J,
pending = Pending + 1});
loop(#state{pending = Pending, last_print = LastPrint,
done = Done, last_done = LastDone} = State) ->
receive
done ->
Now = make_timestamp(),
NewDone = Done + 1,
if
Now >= LastPrint + 1.0 ->
io:format("~B done, ~.1f put/s~n", [NewDone, (NewDone -
LastDone) / (Now - LastPrint)]),
loop(State#state{pending = Pending - 1,
done = NewDone,
last_print = Now,
last_done = NewDone});
true ->
loop(State#state{pending = Pending - 1,
done = NewDone})
end
end.
make_timestamp() ->
{MS, S, SS} = now(),
MS * 1000000 + S + SS / 1000000.
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