2023-01-21 02:00:17 +02:00
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# bench
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2023-01-21 02:39:08 +02:00
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2023-01-21 02:04:58 +02:00
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Various C++ benchmarks:
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- transform.cpp - benchmark std::transform vs loop and custom lowercase and tolower
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2026-02-07 15:41:27 +02:00
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---
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```shell
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$ make releasec # clang++ 21.1.8
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$ ./build/releasec/transform
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```
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2026-02-07T15:43:00+02:00
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Running ./build/releasec/transform
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Run on (32 X 5187.5 MHz CPU s)
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CPU Caches:
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L1 Data 48 KiB (x16)
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L1 Instruction 32 KiB (x16)
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L2 Unified 1024 KiB (x16)
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L3 Unified 32768 KiB (x2)
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Load Average: 0.58, 0.53, 0.60
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***WARNING*** CPU scaling is enabled, the benchmark real time measurements may be noisy and will incur extra overhead.
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***WARNING*** ASLR is enabled, the results may have unreproducible noise in them.
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----------------------------------------------------------------------
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Benchmark Time CPU Iterations
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----------------------------------------------------------------------
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algorithm_lowercase_my 17.8 ns 17.7 ns 39664595
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loop_lowercase_my 31.9 ns 31.9 ns 22028280
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algorithm_lowercase_toupper 79.3 ns 79.2 ns 8838048
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loop_lowercase_toupper 69.7 ns 69.5 ns 9977740
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---
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```shell
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$ make release # g++ 15.2.1
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$ ./build/release/transform
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```
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2026-02-07T15:43:03+02:00
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Running ./build/release/transform
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Run on (32 X 5187.5 MHz CPU s)
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CPU Caches:
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L1 Data 48 KiB (x16)
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L1 Instruction 32 KiB (x16)
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L2 Unified 1024 KiB (x16)
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L3 Unified 32768 KiB (x2)
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Load Average: 0.61, 0.54, 0.60
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***WARNING*** CPU scaling is enabled, the benchmark real time measurements may be noisy and will incur extra overhead.
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***WARNING*** ASLR is enabled, the results may have unreproducible noise in them.
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----------------------------------------------------------------------
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Benchmark Time CPU Iterations
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----------------------------------------------------------------------
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algorithm_lowercase_my 17.7 ns 17.7 ns 33607332
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loop_lowercase_my 28.2 ns 28.2 ns 24781013
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algorithm_lowercase_toupper 77.1 ns 77.0 ns 9116098
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loop_lowercase_toupper 65.5 ns 65.4 ns 10687636
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---
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<img src="bench_lowercase_gcc13_cpp23.png" alt="gcc13" style="width:98%;"/>
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<img src="bench_lowercase_clang17_cpp23.png" alt="clang17" style="width:98%;"/>
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---
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