2 Commits

Author	SHA1	Message	Date
JCrawfy	7ba36b5e73	fix dumb bug in input randomiser, add basic double->string benchmarks ... * input randomiser was feeding a constant value previously, now actually randomising * start to_string with the current method (sstream), an faster more correct version (sstream_cached), snprintf, and std::to_chars ** NOTE: only std::to_chars and sstream_cached are correct in the face of locales Run on (4 X 3500 MHz CPU s) CPU Caches: L1 Data 32K (x4) L1 Instruction 32K (x4) L2 Unified 262K (x4) L3 Unified 6291K (x1) ------------------------------------------------------------------------------------------------------------- Benchmark Time CPU Iterations ------------------------------------------------------------------------------------------------------------- RandFloatStrs/double_from_string_sstream 1012 ns 1001 ns 640000 RandFloatStrs/double_from_string_strtod 276 ns 276 ns 2488889 RandFloatStrs/double_from_string_strtod_fixed 312 ns 308 ns 2133333 RandFloatStrs/double_from_string_strtod_fixed_const_ref 307 ns 300 ns 2240000 RandFloatStrs/double_from_string_std_from_chars 194 ns 188 ns 3733333 RandFloatCommaStrs/double_from_string_strtod_fixed_comma_ref 315 ns 314 ns 2240000 RandFloatCommaStrs/double_from_string_strtod_fixed_comma_const_ref 306 ns 305 ns 2357895 RandFloats/string_from_double_sstream 1372 ns 1381 ns 497778 RandFloats/string_from_double_sstream_cached 1136 ns 1123 ns 640000 RandFloats/string_from_double_snprintf 536 ns 516 ns 1000000 RandFloats/string_from_double_std_to_chars 116 ns 115 ns 6400000	2020-02-29 22:59:25 +13:00
JCrawfy	0adb8a69b1	add micro benchmarking project, setup number parsing benchmark ... relating to previous work https://github.com/tfussell/xlnt/issues/422 Results are matching what was observed at the time ^^ was being worked on std::from_chars is included as the target to beat, but since only MSVC has it for floating point it's not hugely useful yet uniform real distribution is probably a horrible choice, and it might be good to randomise the number of sf in each string also (currently the y all end up at max length) Run on (4 X 3500 MHz CPU s) CPU Caches: L1 Data 32K (x4) L1 Instruction 32K (x4) L2 Unified 262K (x4) L3 Unified 6291K (x1) ---------------------------------------------------------------------------------------------------------- Benchmark Time CPU Iterations ---------------------------------------------------------------------------------------------------------- RandFloats/double_from_string_sstream 804 ns 820 ns 896000 RandFloats/double_from_string_strtod 163 ns 162 ns 5973333 RandFloats/double_from_string_strtod_fixed 175 ns 172 ns 5352107 RandFloats/double_from_string_strtod_fixed_const_ref 150 ns 152 ns 5352107 RandFloats/double_from_string_std_from_chars 87.1 ns 88.3 ns 9557333 RandFloatsComma/double_from_string_strtod_fixed_comma_ref 172 ns 173 ns 5146257 RandFloatsComma/double_from_string_strtod_fixed_comma_const_ref 180 ns 175 ns 5352107	2020-02-29 22:11:31 +13:00