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Update bf.ex #178

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@poland-can-into-space poland-can-into-space commented Sep 5, 2019 •
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I made it faster and memory efficient by using ets tables.
Below is a statistical report generated by Benchee

Name ips average deviation median 99th %
ets 0.00689 2.42 min ±0.00% 2.42 min 2.42 min
original 0.00624 2.67 min ±0.00% 2.67 min 2.67 min

Comparison:
ets 0.00689
original 0.00624 - 1.10x slower +0.25 min

Memory usage statistics:

Name Memory usage
ets 13.12 GB
original 100.76 GB - 7.68x memory usage +87.65 GB

system

available_memory: "3.85 GB",
cpu_speed: "Intel(R) Xeon(R) Platinum 8168 CPU @ 2.70GHz",
elixir: "1.9.1",
erlang: "22.0.7",
num_cores: 2,
os: :Linux

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