Add Redis resource utilization benchmarks

[skeggse]

We updated the benchmarks to show throughput for job processing across different job queues, but didn't instrument or compare their Redis utilization. We should do that.

[manast]

I recommend you do that after this PR is merged: OptimalBits/bull#641

[skeggse]

Some related results: #69. Unfortunately not a complete Redis util benchmark.

See also: results-2017-08-12.json

[bradvogel]

Thanks for adding. So it looks like based on the raw results, Bee Queue is still roughly 2x faster than Bull 3.0rc5. Cc @manast

[manast]

@bradvogel hmm, more like 1.5x I would say. I am quite happy with the results so far. The concurrency issue is gone which was the most important issue in 3.0.

[manast]

Btw. something to consider. Bull has many more .lua files than bq to read and compile when it starts. This time is also computed in the test, could add 0.5 to 1 second to the total benchmark time.

[bradvogel]

Youre right - about 1.5x. Not sure about the startup time, but that could have also influenced the tests. Looks like Bull 3rc5 is getting close, and has just fine performance for 99% of queue use cases.