Randomness enhancements.

[evanmcc]

Sometimes you want randomness more than reproducability.

Introduce the option to use now() to initialize your rng.

To use, add the following line to your bb config file:
{rng_seed, now}.

[seancribbs]

@evanmcc What if that config key is undefined? Shouldn't we just use now() or os:timestamp()?

[evanmcc]

that config key is always defined, see basho_bench.app.src:

  {env, [
         %%
         %% Mode of load generation:
         %% max - Generate as many requests as possible per worker
         %% {rate, Rate} - Exp. distributed Mean reqs/sec
         %%
         {mode, {rate, 5}},

        %% <snip>

         %%
         {rng_seed, {42, 23, 12}}
        ]}

[evanmcc]

What about if I moved the definition from the env to the get call?

[seancribbs]

Works for me. There seems to be no good reason to have that statically defined.

[evanmcc]

updated.

I think that since it's currently statically defined, I'd like to leave it as is to avoid breaking any currently existing code that relies on that functionality.

[slfritchie]

+1 to merge, thanks!