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| julia> using BenchmarkTools | |
| julia> using Dictionaries | |
| julia> function f(d) | |
| for _ = 1:1000 | |
| set!(d, 1, 1) | |
| unset!(d, 1) | |
| end | |
| end | |
| f (generic function with 1 method) | |
| julia> @benchmark f(d) setup=(d=Dict{Int,Int}()) | |
| BenchmarkTools.Trial: 10000 samples with 1 evaluation. | |
| Range (min … max): 15.860 μs … 1.987 ms ┊ GC (min … max): 0.00% … 98.90% | |
| Time (median): 17.323 μs ┊ GC (median): 0.00% | |
| Time (mean ± σ): 19.957 μs ± 52.206 μs ┊ GC (mean ± σ): 7.36% ± 2.79% | |
| ▅▆▇███▇▇▅▅▄▃▂▁▁▁ ▁▁ ▁ ▁▁▁▁▁▂▂▃▂▂▂▃▂▂▂▂▁▁▁▁ ▃ | |
| ▇█████████████████████████████████████████████▇█▇▆▇▅▇▇▆▇▅▄▅ █ | |
| 15.9 μs Histogram: log(frequency) by time 29.2 μs < | |
| Memory estimate: 37.61 KiB, allocs estimate: 249. | |
| julia> @benchmark f(d) setup=(d=Dictionary{Int,Int}()) | |
| BenchmarkTools.Trial: 10000 samples with 1 evaluation. | |
| Range (min … max): 33.273 μs … 172.287 μs ┊ GC (min … max): 0.00% … 0.00% | |
| Time (median): 34.897 μs ┊ GC (median): 0.00% | |
| Time (mean ± σ): 35.955 μs ± 4.889 μs ┊ GC (mean ± σ): 0.00% ± 0.00% | |
| ▁▃▆▆█▆▄▂▁ ▁ ▁ ▁ | |
| ██████████▆▆▆▆▆▆▆▇▆▆▆▆▅▆▅▇▆██▇▆▅▅▄▅▄▄▄▅▃▄▄▄▃▄▃▄▃▃▃▃▃▄▃▆██▆▆▅ █ | |
| 33.3 μs Histogram: log(frequency) by time 55.5 μs < | |
| Memory estimate: 0 bytes, allocs estimate: 0. | |
| julia> @benchmark f(d) setup=(d=UnorderedDictionary{Int,Int}()) | |
| BenchmarkTools.Trial: 10000 samples with 1 evaluation. | |
| Range (min … max): 10.149 μs … 76.165 μs ┊ GC (min … max): 0.00% … 0.00% | |
| Time (median): 10.359 μs ┊ GC (median): 0.00% | |
| Time (mean ± σ): 10.647 μs ± 1.665 μs ┊ GC (mean ± σ): 0.00% ± 0.00% | |
| ▇█▇▃▂▃▁▁▁▁ ▁▁ ▂ | |
| ███████████████▆▅▆▆▆▅▄▅█▇▆████▆▆▅▅▅▅▅▅▆▅▆▅▄▅▅▆▅▅▃▅▅▅▁▄▃▅▄▆▅ █ | |
| 10.1 μs Histogram: log(frequency) by time 16.5 μs < | |
| Memory estimate: 0 bytes, allocs estimate: 0. |
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Probably caused by this rehash triggered by the number of deletes https://github.com/JuliaLang/julia/blob/580f51d26fe2cff97e6ee7a8af12c42ff9ed272b/base/dict.jl#L366