Created
August 10, 2024 11:15
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Compare performance of solutions that is based on `case` and uses a Map to get values
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| Mix.install([:benchee]) | |
| defmodule ResistorColor do | |
| @color_map %{ | |
| black: 0, | |
| brown: 1, | |
| red: 2, | |
| orange: 3, | |
| yellow: 4, | |
| green: 5, | |
| blue: 6, | |
| violet: 7, | |
| grey: 8, | |
| white: 9 | |
| } | |
| def code_via_map(color) do | |
| @color_map[color] | |
| end | |
| def code_via_case(color) do | |
| case color do | |
| :black -> 0 | |
| :brown -> 1 | |
| :red -> 2 | |
| :orange -> 3 | |
| :yellow -> 4 | |
| :green -> 5 | |
| :blue -> 6 | |
| :violet -> 7 | |
| :grey -> 8 | |
| :white -> 9 | |
| _ -> nil | |
| end | |
| end | |
| end | |
| input = ~w[black brown red orange yellow green blue violet grey white noneexistent]a | |
| case_res = Enum.map(input, &ResistorColor.code_via_case/1) | |
| map_res = Enum.map(input, &ResistorColor.code_via_map/1) | |
| IO.inspect(case_res == map_res, label: "Both approaches give the same results") | |
| Benchee.run( | |
| %{ | |
| "case" => fn -> Enum.map(input, &ResistorColor.code_via_case/1) end, | |
| "map" => fn -> Enum.map(input, &ResistorColor.code_via_map/1) end | |
| }, | |
| time: 2, | |
| memory_time: 2, | |
| reduction_time: 2, | |
| print: [fast_warning: false] | |
| ) |
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| Both approaches give the same results: true | |
| Operating System: macOS | |
| CPU Information: Apple M3 Pro | |
| Number of Available Cores: 11 | |
| Available memory: 18 GB | |
| Elixir 1.17.2 | |
| Erlang 27.0.1 | |
| JIT enabled: true | |
| Benchmark suite executing with the following configuration: | |
| warmup: 2 s | |
| time: 2 s | |
| memory time: 2 s | |
| reduction time: 2 s | |
| parallel: 1 | |
| inputs: none specified | |
| Estimated total run time: 16 s | |
| Benchmarking case ... | |
| Benchmarking map ... | |
| Calculating statistics... | |
| Formatting results... | |
| Name ips average deviation median 99th % | |
| case 12.31 M 81.27 ns ±6986.70% 45.80 ns 141.70 ns | |
| map 4.53 M 220.91 ns ±23389.70% 125 ns 791 ns | |
| Comparison: | |
| case 12.31 M | |
| map 4.53 M - 2.72x slower +139.65 ns | |
| Memory usage statistics: | |
| Name Memory usage | |
| case 176 B | |
| map 176 B - 1.00x memory usage +0 B | |
| **All measurements for memory usage were the same** | |
| Reduction count statistics: | |
| Name Reduction count | |
| case 46 | |
| map 68 - 1.48x reduction count +22 | |
| **All measurements for reduction count were the same** |
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