[NoMerge] For davidfowl

[benaadams]

@davidfowl wanted some numbers

Following changes merged

Change #1318
Change #1313
Change #1308
Change #1301

Needs aspnet/HttpAbstractions#757 for the changes
And aspnet/Benchmarks#170 to use benchmarks repo with changes

Kestrel benchmark testing

Before dotnet run -c Release RequestParsing

                   Method |          Mean |      StdDev | Scaled |          RPS | Allocated |
------------------------- |-------------- |------------ |------- |------------- |---------- |
           ParsePlaintext |   752.8983 ns |  30.0983 ns |   1.00 | 1,328,200.67 |     103 B |
  ParsePipelinedPlaintext |   590.5970 ns |   4.6015 ns |   0.79 | 1,693,202.05 |     103 B |
          ParseLiveAspNet | 3,669.5090 ns |  82.0207 ns |   4.88 |   272,516.02 |   1.09 kB |
 ParsePipelinedLiveAspNet | 3,337.8771 ns |  61.1607 ns |   4.44 |   299,591.61 |    1.1 kB |
             ParseUnicode | 6,073.9618 ns |  84.9393 ns |   8.08 |   164,637.19 |   1.92 kB |
    ParseUnicodePipelined | 5,895.0197 ns | 110.8188 ns |   7.84 |   169,634.72 |   1.92 kB |

After

                   Method |          Mean |      StdDev | Scaled |          RPS | Allocated |
------------------------- |-------------- |------------ |------- |------------- |---------- |
           ParsePlaintext |   703.4463 ns |   6.1967 ns |   1.00 | 1,421,572.54 |     103 B |
  ParsePipelinedPlaintext |   577.9539 ns |   6.4741 ns |   0.82 | 1,730,241.75 |     103 B |
          ParseLiveAspNet | 3,308.9771 ns | 100.9436 ns |   4.70 |   302,208.20 |   1.09 kB |
 ParsePipelinedLiveAspNet | 3,051.5007 ns |  50.2546 ns |   4.34 |   327,707.61 |    1.1 kB |
             ParseUnicode | 5,751.9464 ns | 109.8296 ns |   8.18 |   173,854.19 |   1.92 kB |
    ParseUnicodePipelined | 5,407.8456 ns | 126.0240 ns |   7.69 |   184,916.52 |   1.92 kB |

Before dotnet run -c Release ResponseHeaders

        Method |                 Type |          Mean |     StdDev |           RPS | Allocated |
-------------- |--------------------- |-------------- |----------- |-------------- |---------- |
    SetHeaders |            Plaintext |   156.8055 ns |  4.4623 ns |  6,377,325.86 |      31 B |
 OutputHeaders |            Plaintext |   146.2860 ns |  1.3579 ns |  6,835,924.41 |       0 B |
    SetHeaders |               Common | 1,410.4890 ns | 13.9366 ns |    708,973.99 |      31 B |
 OutputHeaders |               Common |   839.1053 ns |  5.5641 ns |  1,191,745.56 |       0 B |
    SetHeaders | ContentLengthNumeric |    86.6333 ns |  1.3831 ns | 11,542,906.01 |      31 B |
 OutputHeaders | ContentLengthNumeric |    78.5276 ns |  1.0887 ns | 12,734,383.25 |       0 B |
    SetHeaders |  ContentLengthString |    58.3702 ns |  0.7405 ns | 17,132,040.17 |       0 B |
 OutputHeaders |  ContentLengthString |    74.1068 ns |  0.8684 ns | 13,494,037.03 |       0 B |
    SetHeaders |              Unknown | 2,427.5306 ns | 25.6492 ns |    411,941.26 |      31 B |
 OutputHeaders |              Unknown | 1,222.1461 ns | 15.1807 ns |    818,232.77 |       0 B |

After

        Method |                 Type |          Mean |     StdDev |           RPS |
-------------- |--------------------- |-------------- |----------- |-------------- |
    SetHeaders |            Plaintext |    73.3054 ns |  1.1412 ns | 13,641,558.38 |
 OutputHeaders |            Plaintext |   135.1715 ns |  2.0847 ns |  7,398,011.34 |
    SetHeaders |               Common |   870.6936 ns | 13.5975 ns |  1,148,509.71 |
 OutputHeaders |               Common |   733.3460 ns |  7.1410 ns |  1,363,612.85 |
    SetHeaders | ContentLengthNumeric |    40.9641 ns |  0.6048 ns | 24,411,630.07 |
 OutputHeaders | ContentLengthNumeric |    71.3207 ns |  0.7880 ns | 14,021,166.89 |
    SetHeaders |  ContentLengthString |    71.5608 ns |  0.8682 ns | 13,974,127.54 |
 OutputHeaders |  ContentLengthString |    69.7093 ns |  1.0001 ns | 14,345,296.90 |
    SetHeaders |              Unknown | 1,402.3272 ns | 14.9522 ns |    713,100.31 |
 OutputHeaders |              Unknown | 1,082.5272 ns | 13.1398 ns |    923,764.28 |

[benaadams]

@CesarBS found the benchmark start issue; if you include a src project in global.json; you also need to include it in the Performance global.json otherwise it compiles, rerestores, compiles and first test errors as compile hasn't written when it starts. Is a bit weird

[cesarblum]

@benaadams Are you referring to #1314 (comment)? Problem is we don't have global.json anymore.

[benaadams]

One in https://github.com/aspnet/KestrelHttpServer/blob/dev/test/Microsoft.AspNetCore.Server.Kestrel.Performance/global.json