[all-commits] [llvm/llvm-project] 890a5c: [libc++][format][3/7] Improves std::format perform...
Mark de Wever via All-commits
all-commits at lists.llvm.org
Sat Aug 3 04:30:59 PDT 2024
Branch: refs/heads/users/mordante/format_performance__format
Home: https://github.com/llvm/llvm-project
Commit: 890a5c8c4de141c1463e20feea35dad24bbcdcf5
https://github.com/llvm/llvm-project/commit/890a5c8c4de141c1463e20feea35dad24bbcdcf5
Author: Mark de Wever <koraq at xs4all.nl>
Date: 2024-08-03 (Sat, 03 Aug 2024)
Changed paths:
M libcxx/include/__format/buffer.h
M libcxx/include/__format/format_functions.h
Log Message:
-----------
[libc++][format][3/7] Improves std::format performance.
This changes the __output_buffer to a new structure. Since the other
formatting fucntions std::format_to, std::format_to_n, and
std::formatted_size still use the old codepaths the class is in a
transition state. At the end of the series the class should be in its
final state.
write_double_comparison:
Before
----------------------------------------------------------------------------------------
Benchmark Time CPU Iterations
----------------------------------------------------------------------------------------
BM_sprintf 197 ns 196 ns 3550000
BM_to_string 218 ns 218 ns 3214000
BM_to_chars 42.4 ns 42.3 ns 16575000
BM_to_chars_as_string 48.2 ns 48.1 ns 14542000
BM_format 175 ns 175 ns 4000000
BM_format_to_back_inserter<std::string> 175 ns 175 ns 3995000
BM_format_to_back_inserter<std::vector<char>> 207 ns 206 ns 3393000
BM_format_to_back_inserter<std::list<char>> 752 ns 750 ns 931000
BM_format_to_iterator/<std::array> 161 ns 161 ns 4345000
BM_format_to_iterator/<std::string> 161 ns 161 ns 4344000
BM_format_to_iterator/<std::vector> 162 ns 161 ns 4344000
After
----------------------------------------------------------------------------------------
Benchmark Time CPU Iterations
----------------------------------------------------------------------------------------
BM_sprintf 197 ns 197 ns 3550000
BM_to_string 219 ns 219 ns 3199000
BM_to_chars 42.4 ns 42.4 ns 16554000
BM_to_chars_as_string 48.1 ns 48.1 ns 14569000
BM_format 167 ns 167 ns 4203000
BM_format_to_back_inserter<std::string> 179 ns 179 ns 3920000
BM_format_to_back_inserter<std::vector<char>> 214 ns 214 ns 3274000
BM_format_to_back_inserter<std::list<char>> 751 ns 751 ns 930000
BM_format_to_iterator/<std::array> 164 ns 164 ns 4258000
BM_format_to_iterator/<std::string> 165 ns 164 ns 4247000
BM_format_to_iterator/<std::vector> 165 ns 165 ns 4248000
Comparison
Benchmark Time CPU Time Old Time New CPU Old CPU New
--------------------------------------------------------------------------------------------------------------------------------------------
BM_sprintf +0.0013 +0.0028 197 197 196 197
BM_to_string +0.0023 +0.0038 218 219 218 219
BM_to_chars +0.0014 +0.0030 42 42 42 42
BM_to_chars_as_string -0.0025 -0.0010 48 48 48 48
BM_format -0.0476 -0.0462 175 167 175 167
BM_format_to_back_inserter<std::string> +0.0190 +0.0205 175 179 175 179
BM_format_to_back_inserter<std::vector<char>> +0.0348 +0.0363 207 214 206 214
BM_format_to_back_inserter<std::list<char>> -0.0013 +0.0005 752 751 750 751
BM_format_to_iterator/<std::array> +0.0188 +0.0203 161 164 161 164
BM_format_to_iterator/<std::string> +0.0207 +0.0226 161 165 161 164
BM_format_to_iterator/<std::vector> +0.0197 +0.0212 162 165 161 165
OVERALL_GEOMEAN +0.0058 +0.0074 0 0 0 0
write_int_comparison:
Before
----------------------------------------------------------------------------------------
Benchmark Time CPU Iterations
----------------------------------------------------------------------------------------
BM_sprintf 79.6 ns 79.5 ns 8739000
BM_to_string 14.9 ns 14.9 ns 46713000
BM_to_chars 5.68 ns 5.67 ns 120614000
BM_to_chars_as_string 14.2 ns 14.1 ns 49513000
BM_format 69.3 ns 69.2 ns 10105000
BM_format_to_back_inserter<std::string> 69.2 ns 69.1 ns 10138000
BM_format_to_back_inserter<std::vector<char>> 90.6 ns 90.5 ns 7728000
BM_format_to_back_inserter<std::list<char>> 234 ns 234 ns 2986000
BM_format_to_iterator/<std::array> 59.3 ns 59.3 ns 11805000
BM_format_to_iterator/<std::string> 58.7 ns 58.6 ns 11943000
BM_format_to_iterator/<std::vector> 60.1 ns 60.1 ns 11670000
After
----------------------------------------------------------------------------------------
Benchmark Time CPU Iterations
----------------------------------------------------------------------------------------
BM_sprintf 80.2 ns 80.2 ns 8670000
BM_to_string 15.0 ns 15.0 ns 46559000
BM_to_chars 4.93 ns 4.93 ns 138016000
BM_to_chars_as_string 15.4 ns 15.4 ns 45415000
BM_format 62.1 ns 62.0 ns 11316000
BM_format_to_back_inserter<std::string> 70.2 ns 70.2 ns 9962000
BM_format_to_back_inserter<std::vector<char>> 92.8 ns 92.8 ns 7544000
BM_format_to_back_inserter<std::list<char>> 240 ns 240 ns 2917000
BM_format_to_iterator/<std::array> 60.5 ns 60.5 ns 11572000
BM_format_to_iterator/<std::string> 60.2 ns 60.2 ns 11653000
BM_format_to_iterator/<std::vector> 60.1 ns 60.1 ns 11659000
Comparison
Benchmark Time CPU Time Old Time New CPU Old CPU New
--------------------------------------------------------------------------------------------------------------------------------------------
BM_sprintf +0.0072 +0.0081 80 80 80 80
BM_to_string +0.0043 +0.0053 15 15 15 15
BM_to_chars -0.1324 -0.1316 6 5 6 5
BM_to_chars_as_string +0.0895 +0.0906 14 15 14 15
BM_format -0.1047 -0.1040 69 62 69 62
BM_format_to_back_inserter<std::string> +0.0148 +0.0157 69 70 69 70
BM_format_to_back_inserter<std::vector<char>> +0.0241 +0.0251 91 93 90 93
BM_format_to_back_inserter<std::list<char>> +0.0222 +0.0232 234 240 234 240
BM_format_to_iterator/<std::array> +0.0196 +0.0205 59 60 59 60
BM_format_to_iterator/<std::string> +0.0266 +0.0275 59 60 59 60
BM_format_to_iterator/<std::vector> -0.0004 +0.0005 60 60 60 60
OVERALL_GEOMEAN -0.0045 -0.0036 0 0 0 0
write_string_comparison:
Before
---------------------------------------------------------------------------------------------------------------
Benchmark Time CPU Iterations
---------------------------------------------------------------------------------------------------------------
BM_sprintf/C string len = 6 4.82 ns 4.82 ns 145548481
BM_format/C string len = 6 55.1 ns 55.1 ns 12713693
BM_format_to_back_inserter<std::string>/C string len = 6 55.1 ns 55.1 ns 12690821
BM_format_to_back_inserter<std::vector<char>>/C string len = 6 71.5 ns 71.5 ns 9805550
BM_format_to_back_inserter<std::deque<char>>/C string len = 6 154 ns 154 ns 4536256
BM_format_to_back_inserter<std::list<char>>/C string len = 6 130 ns 130 ns 5348845
BM_format_to_iterator/<std::array> C string len = 6 44.9 ns 44.9 ns 15556175
BM_format_to_iterator/<std::string> C string len = 6 45.8 ns 45.8 ns 15290662
BM_format_to_iterator/<std::vector> C string len = 6 44.4 ns 44.4 ns 15807704
BM_format_to_iterator/<std::deque> C string len = 6 50.0 ns 50.0 ns 13973893
BM_format/string len = 6 54.7 ns 54.7 ns 12793406
BM_format_to_back_inserter<std::string>/string len = 6 55.5 ns 55.5 ns 12620370
BM_format_to_back_inserter<std::vector<char>>/string len = 6 70.4 ns 70.4 ns 9936490
BM_format_to_back_inserter<std::deque<char>>/string len = 6 155 ns 155 ns 4521357
BM_format_to_back_inserter<std::list<char>>/string len = 6 135 ns 135 ns 5201519
BM_format_to_iterator/<std::array> string len = 6 44.6 ns 44.6 ns 15703872
BM_format_to_iterator/<std::string> string len = 6 45.0 ns 45.0 ns 15545182
BM_format_to_iterator/<std::vector> string len = 6 45.0 ns 45.0 ns 15539130
BM_format_to_iterator/<std::deque> string len = 6 50.5 ns 50.5 ns 13846916
BM_format/string_view len = 6 54.6 ns 54.6 ns 12821301
BM_format_to_back_inserter<std::string>/string_view len = 6 54.6 ns 54.6 ns 12827673
BM_format_to_back_inserter<std::vector<char>>/string_view len = 6 69.9 ns 69.9 ns 9958365
BM_format_to_back_inserter<std::deque<char>>/string_view len = 6 157 ns 157 ns 4462445
BM_format_to_back_inserter<std::list<char>>/string_view len = 6 134 ns 134 ns 5232155
BM_format_to_iterator/<std::array> string_view len = 6 44.2 ns 44.2 ns 15871362
BM_format_to_iterator/<std::string> string_view len = 6 45.0 ns 45.0 ns 15582582
BM_format_to_iterator/<std::vector> string_view len = 6 45.1 ns 45.1 ns 15539906
BM_format_to_iterator/<std::deque> string_view len = 6 50.5 ns 50.5 ns 13896524
BM_sprintf/C string len = 60 4.15 ns 4.15 ns 168165776
BM_format/C string len = 60 73.8 ns 73.8 ns 9498291
BM_format_to_back_inserter<std::string>/C string len = 60 73.6 ns 73.6 ns 9535890
BM_format_to_back_inserter<std::vector<char>>/C string len = 60 83.1 ns 83.1 ns 8428154
BM_format_to_back_inserter<std::deque<char>>/C string len = 60 281 ns 281 ns 2490093
BM_format_to_back_inserter<std::list<char>>/C string len = 60 1157 ns 1157 ns 605227
BM_format_to_iterator/<std::array> C string len = 60 44.9 ns 44.9 ns 15604442
BM_format_to_iterator/<std::string> C string len = 60 45.8 ns 45.8 ns 15272196
BM_format_to_iterator/<std::vector> C string len = 60 44.6 ns 44.7 ns 15683193
BM_format_to_iterator/<std::deque> C string len = 60 50.6 ns 50.6 ns 13698382
BM_format/string len = 60 72.3 ns 72.3 ns 9648955
BM_format_to_back_inserter<std::string>/string len = 60 72.0 ns 72.0 ns 9738373
BM_format_to_back_inserter<std::vector<char>>/string len = 60 82.3 ns 82.3 ns 8517896
BM_format_to_back_inserter<std::deque<char>>/string len = 60 280 ns 280 ns 2496054
BM_format_to_back_inserter<std::list<char>>/string len = 60 1162 ns 1162 ns 602383
BM_format_to_iterator/<std::array> string len = 60 44.5 ns 44.5 ns 15727799
BM_format_to_iterator/<std::string> string len = 60 49.6 ns 49.6 ns 14096012
BM_format_to_iterator/<std::vector> string len = 60 49.8 ns 49.8 ns 14053734
BM_format_to_iterator/<std::deque> string len = 60 50.8 ns 50.8 ns 13801448
BM_format/string_view len = 60 72.5 ns 72.5 ns 9653638
BM_format_to_back_inserter<std::string>/string_view len = 60 72.7 ns 72.7 ns 9598203
BM_format_to_back_inserter<std::vector<char>>/string_view len = 60 81.9 ns 81.9 ns 8522306
BM_format_to_back_inserter<std::deque<char>>/string_view len = 60 283 ns 283 ns 2475014
BM_format_to_back_inserter<std::list<char>>/string_view len = 60 1162 ns 1162 ns 600924
BM_format_to_iterator/<std::array> string_view len = 60 44.1 ns 44.1 ns 15858951
BM_format_to_iterator/<std::string> string_view len = 60 44.9 ns 44.9 ns 15579340
BM_format_to_iterator/<std::vector> string_view len = 60 44.9 ns 44.9 ns 15586711
BM_format_to_iterator/<std::deque> string_view len = 60 50.0 ns 50.0 ns 13980804
BM_sprintf/C string len = 6000 116 ns 116 ns 6051541
BM_format/C string len = 6000 1000 ns 1000 ns 698647
BM_format_to_back_inserter<std::string>/C string len = 6000 1002 ns 1002 ns 701440
BM_format_to_back_inserter<std::vector<char>>/C string len = 6000 956 ns 956 ns 727585
BM_format_to_back_inserter<std::deque<char>>/C string len = 6000 14898 ns 14898 ns 46994
BM_format_to_back_inserter<std::list<char>>/C string len = 6000 114860 ns 114859 ns 6106
BM_format_to_iterator/<std::array> C string len = 6000 158 ns 158 ns 4425133
BM_format_to_iterator/<std::string> C string len = 6000 161 ns 161 ns 4335471
BM_format_to_iterator/<std::vector> C string len = 6000 157 ns 157 ns 4444174
BM_format_to_iterator/<std::deque> C string len = 6000 445 ns 445 ns 1574120
BM_format/string len = 6000 929 ns 929 ns 753630
BM_format_to_back_inserter<std::string>/string len = 6000 930 ns 930 ns 752888
BM_format_to_back_inserter<std::vector<char>>/string len = 6000 910 ns 910 ns 771111
BM_format_to_back_inserter<std::deque<char>>/string len = 6000 14875 ns 14876 ns 47221
BM_format_to_back_inserter<std::list<char>>/string len = 6000 114937 ns 114936 ns 6092
BM_format_to_iterator/<std::array> string len = 6000 118 ns 118 ns 5963643
BM_format_to_iterator/<std::string> string len = 6000 106 ns 106 ns 6584711
BM_format_to_iterator/<std::vector> string len = 6000 106 ns 106 ns 6583118
BM_format_to_iterator/<std::deque> string len = 6000 391 ns 391 ns 1790538
BM_format/string_view len = 6000 935 ns 935 ns 744348
BM_format_to_back_inserter<std::string>/string_view len = 6000 934 ns 934 ns 742039
BM_format_to_back_inserter<std::vector<char>>/string_view len = 6000 895 ns 895 ns 783527
BM_format_to_back_inserter<std::deque<char>>/string_view len = 6000 14864 ns 14865 ns 47122
BM_format_to_back_inserter<std::list<char>>/string_view len = 6000 115042 ns 115044 ns 6091
BM_format_to_iterator/<std::array> string_view len = 6000 115 ns 115 ns 6070197
BM_format_to_iterator/<std::string> string_view len = 6000 116 ns 116 ns 6035109
BM_format_to_iterator/<std::vector> string_view len = 6000 115 ns 115 ns 6067683
BM_format_to_iterator/<std::deque> string_view len = 6000 387 ns 387 ns 1803466
After
---------------------------------------------------------------------------------------------------------------
Benchmark Time CPU Iterations
---------------------------------------------------------------------------------------------------------------
BM_sprintf/C string len = 6 3.56 ns 3.56 ns 196337806
BM_format/C string len = 6 49.1 ns 49.1 ns 14241174
BM_format_to_back_inserter<std::string>/C string len = 6 56.8 ns 56.8 ns 12341483
BM_format_to_back_inserter<std::vector<char>>/C string len = 6 72.9 ns 72.9 ns 9610864
BM_format_to_back_inserter<std::deque<char>>/C string len = 6 155 ns 155 ns 4528719
BM_format_to_back_inserter<std::list<char>>/C string len = 6 137 ns 137 ns 5103340
BM_format_to_iterator/<std::array> C string len = 6 46.4 ns 46.4 ns 15081626
BM_format_to_iterator/<std::string> C string len = 6 47.0 ns 47.0 ns 14893458
BM_format_to_iterator/<std::vector> C string len = 6 45.9 ns 45.9 ns 15243762
BM_format_to_iterator/<std::deque> C string len = 6 52.6 ns 52.6 ns 13323560
BM_format/string len = 6 49.3 ns 49.3 ns 14181485
BM_format_to_back_inserter<std::string>/string len = 6 55.4 ns 55.4 ns 12644078
BM_format_to_back_inserter<std::vector<char>>/string len = 6 72.7 ns 72.7 ns 9618696
BM_format_to_back_inserter<std::deque<char>>/string len = 6 154 ns 154 ns 4540873
BM_format_to_back_inserter<std::list<char>>/string len = 6 134 ns 134 ns 5220153
BM_format_to_iterator/<std::array> string len = 6 46.5 ns 46.5 ns 15064445
BM_format_to_iterator/<std::string> string len = 6 47.3 ns 47.3 ns 14786851
BM_format_to_iterator/<std::vector> string len = 6 46.5 ns 46.5 ns 15069381
BM_format_to_iterator/<std::deque> string len = 6 52.9 ns 52.9 ns 13207437
BM_format/string_view len = 6 47.6 ns 47.6 ns 14688449
BM_format_to_back_inserter<std::string>/string_view len = 6 56.1 ns 56.1 ns 12514239
BM_format_to_back_inserter<std::vector<char>>/string_view len = 6 72.0 ns 72.0 ns 9705591
BM_format_to_back_inserter<std::deque<char>>/string_view len = 6 152 ns 152 ns 4607470
BM_format_to_back_inserter<std::list<char>>/string_view len = 6 134 ns 134 ns 5233005
BM_format_to_iterator/<std::array> string_view len = 6 46.0 ns 46.0 ns 15205542
BM_format_to_iterator/<std::string> string_view len = 6 46.5 ns 46.5 ns 15067775
BM_format_to_iterator/<std::vector> string_view len = 6 46.5 ns 46.5 ns 15057288
BM_format_to_iterator/<std::deque> string_view len = 6 51.8 ns 51.8 ns 13564649
BM_sprintf/C string len = 60 4.83 ns 4.83 ns 145020116
BM_format/C string len = 60 72.3 ns 72.3 ns 9665555
BM_format_to_back_inserter<std::string>/C string len = 60 85.0 ns 85.0 ns 8249050
BM_format_to_back_inserter<std::vector<char>>/C string len = 60 94.7 ns 94.7 ns 7398143
BM_format_to_back_inserter<std::deque<char>>/C string len = 60 286 ns 286 ns 2452225
BM_format_to_back_inserter<std::list<char>>/C string len = 60 1179 ns 1179 ns 595011
BM_format_to_iterator/<std::array> C string len = 60 46.1 ns 46.1 ns 15157525
BM_format_to_iterator/<std::string> C string len = 60 47.0 ns 47.0 ns 14899863
BM_format_to_iterator/<std::vector> C string len = 60 45.8 ns 45.8 ns 15272542
BM_format_to_iterator/<std::deque> C string len = 60 58.7 ns 58.7 ns 11958910
BM_format/string len = 60 61.7 ns 61.7 ns 11308865
BM_format_to_back_inserter<std::string>/string len = 60 74.2 ns 74.2 ns 9401855
BM_format_to_back_inserter<std::vector<char>>/string len = 60 86.6 ns 86.6 ns 8079197
BM_format_to_back_inserter<std::deque<char>>/string len = 60 278 ns 278 ns 2519254
BM_format_to_back_inserter<std::list<char>>/string len = 60 1169 ns 1170 ns 597703
BM_format_to_iterator/<std::array> string len = 60 46.4 ns 46.4 ns 15074759
BM_format_to_iterator/<std::string> string len = 60 47.3 ns 47.3 ns 14801107
BM_format_to_iterator/<std::vector> string len = 60 46.3 ns 46.4 ns 15085548
BM_format_to_iterator/<std::deque> string len = 60 52.2 ns 52.2 ns 13331015
BM_format/string_view len = 60 65.0 ns 65.0 ns 10756847
BM_format_to_back_inserter<std::string>/string_view len = 60 78.5 ns 78.5 ns 9051370
BM_format_to_back_inserter<std::vector<char>>/string_view len = 60 87.9 ns 87.9 ns 7946825
BM_format_to_back_inserter<std::deque<char>>/string_view len = 60 280 ns 280 ns 2505999
BM_format_to_back_inserter<std::list<char>>/string_view len = 60 1174 ns 1174 ns 594829
BM_format_to_iterator/<std::array> string_view len = 60 46.3 ns 46.3 ns 15149785
BM_format_to_iterator/<std::string> string_view len = 60 46.7 ns 46.7 ns 15002678
BM_format_to_iterator/<std::vector> string_view len = 60 46.7 ns 46.7 ns 14996445
BM_format_to_iterator/<std::deque> string_view len = 60 52.6 ns 52.6 ns 13255470
BM_sprintf/C string len = 6000 77.1 ns 77.1 ns 9099121
BM_format/C string len = 6000 350 ns 350 ns 2013049
BM_format_to_back_inserter<std::string>/C string len = 6000 992 ns 992 ns 709093
BM_format_to_back_inserter<std::vector<char>>/C string len = 6000 1016 ns 1016 ns 694784
BM_format_to_back_inserter<std::deque<char>>/C string len = 6000 15158 ns 15159 ns 46125
BM_format_to_back_inserter<std::list<char>>/C string len = 6000 115703 ns 115705 ns 6055
BM_format_to_iterator/<std::array> C string len = 6000 166 ns 166 ns 4224749
BM_format_to_iterator/<std::string> C string len = 6000 153 ns 153 ns 4573034
BM_format_to_iterator/<std::vector> C string len = 6000 150 ns 150 ns 4678898
BM_format_to_iterator/<std::deque> C string len = 6000 465 ns 465 ns 1506323
BM_format/string len = 6000 281 ns 281 ns 2462572
BM_format_to_back_inserter<std::string>/string len = 6000 935 ns 935 ns 745376
BM_format_to_back_inserter<std::vector<char>>/string len = 6000 939 ns 939 ns 747498
BM_format_to_back_inserter<std::deque<char>>/string len = 6000 15069 ns 15069 ns 46429
BM_format_to_back_inserter<std::list<char>>/string len = 6000 115537 ns 115539 ns 6063
BM_format_to_iterator/<std::array> string len = 6000 120 ns 120 ns 5849159
BM_format_to_iterator/<std::string> string len = 6000 108 ns 108 ns 6482306
BM_format_to_iterator/<std::vector> string len = 6000 107 ns 107 ns 6547915
BM_format_to_iterator/<std::deque> string len = 6000 397 ns 397 ns 1763729
BM_format/string_view len = 6000 282 ns 282 ns 2490133
BM_format_to_back_inserter<std::string>/string_view len = 6000 927 ns 927 ns 750931
BM_format_to_back_inserter<std::vector<char>>/string_view len = 6000 946 ns 946 ns 735544
BM_format_to_back_inserter<std::deque<char>>/string_view len = 6000 15028 ns 15029 ns 46612
BM_format_to_back_inserter<std::list<char>>/string_view len = 6000 115153 ns 115153 ns 6057
BM_format_to_iterator/<std::array> string_view len = 6000 122 ns 122 ns 5753940
BM_format_to_iterator/<std::string> string_view len = 6000 108 ns 108 ns 6507555
BM_format_to_iterator/<std::vector> string_view len = 6000 107 ns 107 ns 6510450
BM_format_to_iterator/<std::deque> string_view len = 6000 398 ns 398 ns 1762517
Comparison
Benchmark Time CPU Time Old Time New CPU Old CPU New
-------------------------------------------------------------------------------------------------------------------------------------------------------------------
BM_sprintf/C string len = 6 -0.2599 -0.2599 5 4 5 4
BM_format/C string len = 6 -0.1094 -0.1095 55 49 55 49
BM_format_to_back_inserter<std::string>/C string len = 6 +0.0316 +0.0316 55 57 55 57
BM_format_to_back_inserter<std::vector<char>>/C string len = 6 +0.0204 +0.0204 71 73 71 73
BM_format_to_back_inserter<std::deque<char>>/C string len = 6 +0.0023 +0.0023 154 155 154 155
BM_format_to_back_inserter<std::list<char>>/C string len = 6 +0.0521 +0.0520 130 137 130 137
BM_format_to_iterator/<std::array> C string len = 6 +0.0317 +0.0317 45 46 45 46
BM_format_to_iterator/<std::string> C string len = 6 +0.0265 +0.0265 46 47 46 47
BM_format_to_iterator/<std::vector> C string len = 6 +0.0345 +0.0345 44 46 44 46
BM_format_to_iterator/<std::deque> C string len = 6 +0.0511 +0.0511 50 53 50 53
BM_format/string len = 6 -0.0981 -0.0981 55 49 55 49
BM_format_to_back_inserter<std::string>/string len = 6 -0.0028 -0.0028 56 55 56 55
BM_format_to_back_inserter<std::vector<char>>/string len = 6 +0.0331 +0.0331 70 73 70 73
BM_format_to_back_inserter<std::deque<char>>/string len = 6 -0.0040 -0.0040 155 154 155 154
BM_format_to_back_inserter<std::list<char>>/string len = 6 -0.0019 -0.0019 135 134 135 134
BM_format_to_iterator/<std::array> string len = 6 +0.0427 +0.0427 45 46 45 46
BM_format_to_iterator/<std::string> string len = 6 +0.0515 +0.0515 45 47 45 47
BM_format_to_iterator/<std::vector> string len = 6 +0.0316 +0.0316 45 46 45 46
BM_format_to_iterator/<std::deque> string len = 6 +0.0475 +0.0475 51 53 51 53
BM_format/string_view len = 6 -0.1267 -0.1267 55 48 55 48
BM_format_to_back_inserter<std::string>/string_view len = 6 +0.0283 +0.0283 55 56 55 56
BM_format_to_back_inserter<std::vector<char>>/string_view len = 6 +0.0291 +0.0291 70 72 70 72
BM_format_to_back_inserter<std::deque<char>>/string_view len = 6 -0.0305 -0.0306 157 152 157 152
BM_format_to_back_inserter<std::list<char>>/string_view len = 6 -0.0012 -0.0012 134 134 134 134
BM_format_to_iterator/<std::array> string_view len = 6 +0.0426 +0.0426 44 46 44 46
BM_format_to_iterator/<std::string> string_view len = 6 +0.0322 +0.0322 45 46 45 46
BM_format_to_iterator/<std::vector> string_view len = 6 +0.0309 +0.0309 45 46 45 46
BM_format_to_iterator/<std::deque> string_view len = 6 +0.0248 +0.0248 51 52 51 52
BM_sprintf/C string len = 60 +0.1633 +0.1633 4 5 4 5
BM_format/C string len = 60 -0.0203 -0.0203 74 72 74 72
BM_format_to_back_inserter<std::string>/C string len = 60 +0.1548 +0.1548 74 85 74 85
BM_format_to_back_inserter<std::vector<char>>/C string len = 60 +0.1395 +0.1395 83 95 83 95
BM_format_to_back_inserter<std::deque<char>>/C string len = 60 +0.0157 +0.0157 281 286 281 286
BM_format_to_back_inserter<std::list<char>>/C string len = 60 +0.0191 +0.0191 1157 1179 1157 1179
BM_format_to_iterator/<std::array> C string len = 60 +0.0283 +0.0283 45 46 45 46
BM_format_to_iterator/<std::string> C string len = 60 +0.0251 +0.0252 46 47 46 47
BM_format_to_iterator/<std::vector> C string len = 60 +0.0263 +0.0263 45 46 45 46
BM_format_to_iterator/<std::deque> C string len = 60 +0.1592 +0.1591 51 59 51 59
BM_format/string len = 60 -0.1466 -0.1466 72 62 72 62
BM_format_to_back_inserter<std::string>/string len = 60 +0.0299 +0.0299 72 74 72 74
BM_format_to_back_inserter<std::vector<char>>/string len = 60 +0.0522 +0.0522 82 87 82 87
BM_format_to_back_inserter<std::deque<char>>/string len = 60 -0.0099 -0.0099 280 278 280 278
BM_format_to_back_inserter<std::list<char>>/string len = 60 +0.0062 +0.0062 1162 1169 1162 1170
BM_format_to_iterator/<std::array> string len = 60 +0.0430 +0.0430 45 46 45 46
BM_format_to_iterator/<std::string> string len = 60 -0.0466 -0.0466 50 47 50 47
BM_format_to_iterator/<std::vector> string len = 60 -0.0693 -0.0693 50 46 50 46
BM_format_to_iterator/<std::deque> string len = 60 +0.0275 +0.0275 51 52 51 52
BM_format/string_view len = 60 -0.1034 -0.1034 73 65 73 65
BM_format_to_back_inserter<std::string>/string_view len = 60 +0.0790 +0.0790 73 78 73 78
BM_format_to_back_inserter<std::vector<char>>/string_view len = 60 +0.0735 +0.0735 82 88 82 88
BM_format_to_back_inserter<std::deque<char>>/string_view len = 60 -0.0103 -0.0104 283 280 283 280
BM_format_to_back_inserter<std::list<char>>/string_view len = 60 +0.0101 +0.0101 1162 1174 1162 1174
BM_format_to_iterator/<std::array> string_view len = 60 +0.0484 +0.0484 44 46 44 46
BM_format_to_iterator/<std::string> string_view len = 60 +0.0387 +0.0387 45 47 45 47
BM_format_to_iterator/<std::vector> string_view len = 60 +0.0402 +0.0402 45 47 45 47
BM_format_to_iterator/<std::deque> string_view len = 60 +0.0508 +0.0508 50 53 50 53
BM_sprintf/C string len = 6000 -0.3337 -0.3337 116 77 116 77
BM_format/C string len = 6000 -0.6500 -0.6500 1000 350 1000 350
BM_format_to_back_inserter<std::string>/C string len = 6000 -0.0104 -0.0105 1002 992 1002 992
BM_format_to_back_inserter<std::vector<char>>/C string len = 6000 +0.0630 +0.0630 956 1016 956 1016
BM_format_to_back_inserter<std::deque<char>>/C string len = 6000 +0.0175 +0.0175 14898 15158 14898 15159
BM_format_to_back_inserter<std::list<char>>/C string len = 6000 +0.0073 +0.0074 114860 115703 114859 115705
BM_format_to_iterator/<std::array> C string len = 6000 +0.0504 +0.0504 158 166 158 166
BM_format_to_iterator/<std::string> C string len = 6000 -0.0486 -0.0486 161 153 161 153
BM_format_to_iterator/<std::vector> C string len = 6000 -0.0483 -0.0483 157 150 157 150
BM_format_to_iterator/<std::deque> C string len = 6000 +0.0459 +0.0459 445 465 445 465
BM_format/string len = 6000 -0.6975 -0.6975 929 281 929 281
BM_format_to_back_inserter<std::string>/string len = 6000 +0.0050 +0.0050 930 935 930 935
BM_format_to_back_inserter<std::vector<char>>/string len = 6000 +0.0321 +0.0322 910 939 910 939
BM_format_to_back_inserter<std::deque<char>>/string len = 6000 +0.0130 +0.0130 14875 15069 14876 15069
BM_format_to_back_inserter<std::list<char>>/string len = 6000 +0.0052 +0.0052 114937 115537 114936 115539
BM_format_to_iterator/<std::array> string len = 6000 +0.0211 +0.0211 118 120 118 120
BM_format_to_iterator/<std::string> string len = 6000 +0.0146 +0.0146 106 108 106 108
BM_format_to_iterator/<std::vector> string len = 6000 +0.0048 +0.0048 106 107 106 107
BM_format_to_iterator/<std::deque> string len = 6000 +0.0150 +0.0150 391 397 391 397
BM_format/string_view len = 6000 -0.6989 -0.6989 935 282 935 282
BM_format_to_back_inserter<std::string>/string_view len = 6000 -0.0083 -0.0083 934 927 934 927
BM_format_to_back_inserter<std::vector<char>>/string_view len = 6000 +0.0566 +0.0566 895 946 895 946
BM_format_to_back_inserter<std::deque<char>>/string_view len = 6000 +0.0111 +0.0110 14864 15028 14865 15029
BM_format_to_back_inserter<std::list<char>>/string_view len = 6000 +0.0010 +0.0009 115042 115153 115044 115153
BM_format_to_iterator/<std::array> string_view len = 6000 +0.0560 +0.0560 115 122 115 122
BM_format_to_iterator/<std::string> string_view len = 6000 -0.0693 -0.0693 116 108 116 108
BM_format_to_iterator/<std::vector> string_view len = 6000 -0.0703 -0.0703 115 107 115 107
BM_format_to_iterator/<std::deque> string_view len = 6000 +0.0271 +0.0271 387 398 387 398
OVERALL_GEOMEAN -0.0350 -0.0350 0 0 0 0
format:
Before
--------------------------------------------------------------------------------------------
Benchmark Time CPU Iterations UserCounters...
--------------------------------------------------------------------------------------------
BM_format_string<char>/1 55.5 ns 55.5 ns 12463288 bytes_per_second=17.187Mi/s
BM_format_string<char>/2 27.6 ns 27.6 ns 25421994 bytes_per_second=69.1874Mi/s
BM_format_string<char>/4 14.0 ns 14.0 ns 49785656 bytes_per_second=271.524Mi/s
BM_format_string<char>/8 7.07 ns 7.07 ns 99247048 bytes_per_second=1.05444Gi/s
BM_format_string<char>/16 3.53 ns 3.53 ns 198072224 bytes_per_second=4.21726Gi/s
BM_format_string<char>/32 2.31 ns 2.31 ns 302771136 bytes_per_second=12.9138Gi/s
BM_format_string<char>/64 1.15 ns 1.15 ns 606646976 bytes_per_second=51.7527Gi/s
BM_format_string<char>/128 0.597 ns 0.597 ns 1172263936 bytes_per_second=199.688Gi/s
BM_format_string<char>/256 0.327 ns 0.327 ns 2148927744 bytes_per_second=728.678Gi/s
BM_format_string<char>/512 0.248 ns 0.248 ns 2821635584 bytes_per_second=1.8779Ti/s
BM_format_string<char>/1024 0.203 ns 0.203 ns 3433579520 bytes_per_second=4.57798Ti/s
BM_format_string<char>/2048 0.164 ns 0.164 ns 4277524480 bytes_per_second=11.3793Ti/s
BM_format_string<char>/4096 0.137 ns 0.137 ns 5122269184 bytes_per_second=27.2589Ti/s
BM_format_string<char>/8192 0.126 ns 0.126 ns 5564243968 bytes_per_second=59.2812Ti/s
BM_format_string<char>/16384 0.136 ns 0.136 ns 5153013760 bytes_per_second=109.492Ti/s
BM_format_string<char>/32768 0.135 ns 0.135 ns 5165088768 bytes_per_second=219.985Ti/s
BM_format_string<char>/65536 0.243 ns 0.242 ns 2930180096 bytes_per_second=246.57Ti/s
BM_format_string<char>/131072 0.490 ns 0.489 ns 1437990912 bytes_per_second=243.75Ti/s
BM_format_string<char>/262144 0.593 ns 0.592 ns 1183055872 bytes_per_second=402.931Ti/s
BM_format_string<char>/524288 0.643 ns 0.641 ns 1092616192 bytes_per_second=743.445Ti/s
BM_format_string<char>/1048576 0.669 ns 0.668 ns 1045430272 bytes_per_second=1.39478Pi/s
BM_format_string<wchar_t>/1 56.0 ns 55.9 ns 12511543 bytes_per_second=68.2628Mi/s
BM_format_string<wchar_t>/2 28.0 ns 27.9 ns 25062366 bytes_per_second=273.519Mi/s
BM_format_string<wchar_t>/4 14.0 ns 14.0 ns 50257068 bytes_per_second=1.06742Gi/s
BM_format_string<wchar_t>/8 9.24 ns 9.21 ns 76118616 bytes_per_second=3.23473Gi/s
BM_format_string<wchar_t>/16 4.66 ns 4.65 ns 151420352 bytes_per_second=12.8261Gi/s
BM_format_string<wchar_t>/32 2.35 ns 2.35 ns 298417600 bytes_per_second=50.7972Gi/s
BM_format_string<wchar_t>/64 1.35 ns 1.34 ns 521608704 bytes_per_second=177.502Gi/s
BM_format_string<wchar_t>/128 1.03 ns 1.03 ns 680946304 bytes_per_second=463.91Gi/s
BM_format_string<wchar_t>/256 0.849 ns 0.847 ns 825871104 bytes_per_second=1.09901Ti/s
BM_format_string<wchar_t>/512 0.681 ns 0.679 ns 1033245696 bytes_per_second=2.74383Ti/s
BM_format_string<wchar_t>/1024 0.576 ns 0.575 ns 1219777536 bytes_per_second=6.48343Ti/s
BM_format_string<wchar_t>/2048 0.515 ns 0.514 ns 1361629184 bytes_per_second=14.4881Ti/s
BM_format_string<wchar_t>/4096 0.546 ns 0.545 ns 1285427200 bytes_per_second=27.3342Ti/s
BM_format_string<wchar_t>/8192 0.550 ns 0.548 ns 1277042688 bytes_per_second=54.3343Ti/s
BM_format_string<wchar_t>/16384 0.583 ns 0.581 ns 1203879936 bytes_per_second=102.544Ti/s
BM_format_string<wchar_t>/32768 0.640 ns 0.638 ns 1095139328 bytes_per_second=186.82Ti/s
BM_format_string<wchar_t>/65536 0.642 ns 0.640 ns 1093337088 bytes_per_second=372.283Ti/s
BM_format_string<wchar_t>/131072 0.655 ns 0.654 ns 1070596096 bytes_per_second=729.428Ti/s
BM_format_string<wchar_t>/262144 2.68 ns 2.67 ns 262406144 bytes_per_second=357.446Ti/s
BM_format_string<wchar_t>/524288 2.13 ns 2.13 ns 330301440 bytes_per_second=897.574Ti/s
BM_format_string<wchar_t>/1048576 2.44 ns 2.43 ns 288358400 bytes_per_second=1.53149Pi/s
After
--------------------------------------------------------------------------------------------
Benchmark Time CPU Iterations UserCounters...
--------------------------------------------------------------------------------------------
BM_format_string<char>/1 49.3 ns 49.1 ns 14230742 bytes_per_second=19.4054Mi/s
BM_format_string<char>/2 24.8 ns 24.8 ns 28253114 bytes_per_second=77.0465Mi/s
BM_format_string<char>/4 12.4 ns 12.4 ns 56381440 bytes_per_second=307.462Mi/s
BM_format_string<char>/8 6.23 ns 6.21 ns 112951232 bytes_per_second=1.19924Gi/s
BM_format_string<char>/16 3.10 ns 3.09 ns 225822496 bytes_per_second=4.81566Gi/s
BM_format_string<char>/32 1.98 ns 1.98 ns 354208192 bytes_per_second=15.0825Gi/s
BM_format_string<char>/64 0.990 ns 0.987 ns 714296384 bytes_per_second=60.3689Gi/s
BM_format_string<char>/128 0.504 ns 0.503 ns 1399988480 bytes_per_second=237.144Gi/s
BM_format_string<char>/256 0.335 ns 0.334 ns 2084828928 bytes_per_second=712.859Gi/s
BM_format_string<char>/512 0.187 ns 0.186 ns 3760082432 bytes_per_second=2.50102Ti/s
BM_format_string<char>/1024 0.109 ns 0.108 ns 6455339008 bytes_per_second=8.59552Ti/s
BM_format_string<char>/2048 0.080 ns 0.080 ns 8754006016 bytes_per_second=23.2731Ti/s
BM_format_string<char>/4096 0.051 ns 0.051 ns 13786701824 bytes_per_second=73.4088Ti/s
BM_format_string<char>/8192 0.042 ns 0.042 ns 16851435520 bytes_per_second=178.737Ti/s
BM_format_string<char>/16384 0.122 ns 0.122 ns 5746589696 bytes_per_second=122.029Ti/s
BM_format_string<char>/32768 0.107 ns 0.106 ns 6571687936 bytes_per_second=280.122Ti/s
BM_format_string<char>/65536 0.102 ns 0.102 ns 6876626944 bytes_per_second=584.381Ti/s
BM_format_string<char>/131072 0.106 ns 0.105 ns 6643122176 bytes_per_second=1.10413Pi/s
BM_format_string<char>/262144 0.589 ns 0.587 ns 1189609472 bytes_per_second=406.438Ti/s
BM_format_string<char>/524288 0.644 ns 0.642 ns 1088946176 bytes_per_second=743.064Ti/s
BM_format_string<char>/1048576 0.672 ns 0.670 ns 1039138816 bytes_per_second=1.38968Pi/s
BM_format_string<wchar_t>/1 48.7 ns 48.6 ns 14423178 bytes_per_second=78.5263Mi/s
BM_format_string<wchar_t>/2 24.4 ns 24.3 ns 28831748 bytes_per_second=313.869Mi/s
BM_format_string<wchar_t>/4 12.2 ns 12.2 ns 57661220 bytes_per_second=1.2253Gi/s
BM_format_string<wchar_t>/8 7.81 ns 7.79 ns 89887592 bytes_per_second=3.82675Gi/s
BM_format_string<wchar_t>/16 3.88 ns 3.87 ns 180450176 bytes_per_second=15.418Gi/s
BM_format_string<wchar_t>/32 1.98 ns 1.98 ns 354046112 bytes_per_second=60.3262Gi/s
BM_format_string<wchar_t>/64 1.02 ns 1.01 ns 689511680 bytes_per_second=234.906Gi/s
BM_format_string<wchar_t>/128 0.577 ns 0.576 ns 1215361408 bytes_per_second=828.297Gi/s
BM_format_string<wchar_t>/256 0.804 ns 0.802 ns 872249088 bytes_per_second=1.16111Ti/s
BM_format_string<wchar_t>/512 0.642 ns 0.641 ns 1093858304 bytes_per_second=2.90766Ti/s
BM_format_string<wchar_t>/1024 0.517 ns 0.516 ns 1354798080 bytes_per_second=7.21845Ti/s
BM_format_string<wchar_t>/2048 0.469 ns 0.467 ns 1491910656 bytes_per_second=15.9386Ti/s
BM_format_string<wchar_t>/4096 0.794 ns 0.792 ns 883822592 bytes_per_second=18.8156Ti/s
BM_format_string<wchar_t>/8192 0.722 ns 0.720 ns 971718656 bytes_per_second=41.3996Ti/s
BM_format_string<wchar_t>/16384 0.703 ns 0.701 ns 998031360 bytes_per_second=85.0369Ti/s
BM_format_string<wchar_t>/32768 0.724 ns 0.720 ns 971538432 bytes_per_second=165.467Ti/s
BM_format_string<wchar_t>/65536 0.745 ns 0.744 ns 941228032 bytes_per_second=320.665Ti/s
BM_format_string<wchar_t>/131072 0.742 ns 0.740 ns 945422336 bytes_per_second=644.032Ti/s
BM_format_string<wchar_t>/262144 2.99 ns 2.98 ns 234881024 bytes_per_second=319.75Ti/s
BM_format_string<wchar_t>/524288 3.31 ns 3.30 ns 212860928 bytes_per_second=578.085Ti/s
BM_format_string<wchar_t>/1048576 2.69 ns 2.68 ns 260046848 bytes_per_second=1.39081Pi/s
Comparison
Benchmark Time CPU Time Old Time New CPU Old CPU New
--------------------------------------------------------------------------------------------------------------------------------
BM_format_string<char>/1 -0.1122 -0.1143 55 49 55 49
BM_format_string<char>/2 -0.0999 -0.1020 28 25 28 25
BM_format_string<char>/4 -0.1148 -0.1169 14 12 14 12
BM_format_string<char>/8 -0.1186 -0.1207 7 6 7 6
BM_format_string<char>/16 -0.1222 -0.1243 4 3 4 3
BM_format_string<char>/32 -0.1417 -0.1438 2 2 2 2
BM_format_string<char>/64 -0.1407 -0.1427 1 1 1 1
BM_format_string<char>/128 -0.1559 -0.1579 1 1 1 1
BM_format_string<char>/256 +0.0249 +0.0222 0 0 0 0
BM_format_string<char>/512 -0.2473 -0.2491 0 0 0 0
BM_format_string<char>/1024 -0.4661 -0.4674 0 0 0 0
BM_format_string<char>/2048 -0.5096 -0.5111 0 0 0 0
BM_format_string<char>/4096 -0.6278 -0.6287 0 0 0 0
BM_format_string<char>/8192 -0.6674 -0.6683 0 0 0 0
BM_format_string<char>/16384 -0.1005 -0.1027 0 0 0 0
BM_format_string<char>/32768 -0.2127 -0.2147 0 0 0 0
BM_format_string<char>/65536 -0.5796 -0.5781 0 0 0 0
BM_format_string<char>/131072 -0.7844 -0.7844 0 0 0 0
BM_format_string<char>/262144 -0.0073 -0.0086 1 1 1 1
BM_format_string<char>/524288 +0.0017 +0.0005 1 1 1 1
BM_format_string<char>/1048576 +0.0039 +0.0037 1 1 1 1
BM_format_string<wchar_t>/1 -0.1304 -0.1307 56 49 56 49
BM_format_string<wchar_t>/2 -0.1285 -0.1286 28 24 28 24
BM_format_string<wchar_t>/4 -0.1288 -0.1288 14 12 14 12
BM_format_string<wchar_t>/8 -0.1547 -0.1547 9 8 9 8
BM_format_string<wchar_t>/16 -0.1681 -0.1681 5 4 5 4
BM_format_string<wchar_t>/32 -0.1579 -0.1580 2 2 2 2
BM_format_string<wchar_t>/64 -0.2443 -0.2444 1 1 1 1
BM_format_string<wchar_t>/128 -0.4400 -0.4399 1 1 1 1
BM_format_string<wchar_t>/256 -0.0535 -0.0535 1 1 1 1
BM_format_string<wchar_t>/512 -0.0563 -0.0563 1 1 1 1
BM_format_string<wchar_t>/1024 -0.1018 -0.1018 1 1 1 1
BM_format_string<wchar_t>/2048 -0.0910 -0.0910 1 0 1 0
BM_format_string<wchar_t>/4096 +0.4528 +0.4527 1 1 1 1
BM_format_string<wchar_t>/8192 +0.3121 +0.3124 1 1 1 1
BM_format_string<wchar_t>/16384 +0.2059 +0.2059 1 1 1 1
BM_format_string<wchar_t>/32768 +0.1316 +0.1290 1 1 1 1
BM_format_string<wchar_t>/65536 +0.1604 +0.1610 1 1 1 1
BM_format_string<wchar_t>/131072 +0.1326 +0.1326 1 1 1 1
BM_format_string<wchar_t>/262144 +0.1181 +0.1179 3 3 3 3
BM_format_string<wchar_t>/524288 +0.5515 +0.5527 2 3 2 3
BM_format_string<wchar_t>/1048576 +0.1007 +0.1011 2 3 2 3
OVERALL_GEOMEAN -0.1685 -0.1693 0 0 0 0
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