http: reduce multiple output arrays into one #26004

starkwang · 2019-02-08T06:11:20Z

Now we are using output, outputEncodings and outputCallbacks to hold pending data. Reducing them into one array outputData can slightly improve performance and reduce some redundant codes.

Here is the benchmark for client request:

 http/create-clientrequest.js e=1 arg='options' url='idn'                           ***      2.72 %      ±0.93% ±1.23% ±1.61%
 http/create-clientrequest.js e=1 arg='options' url='long'                          ***      1.91 %      ±1.07% ±1.42% ±1.85%
 http/create-clientrequest.js e=1 arg='options' url='wpt'                           ***      2.61 %      ±1.33% ±1.77% ±2.30%
 http/create-clientrequest.js e=1 arg='string' url='idn'                              *      0.79 %      ±0.69% ±0.92% ±1.20%
 http/create-clientrequest.js e=1 arg='string' url='long'                                    0.54 %      ±0.69% ±0.92% ±1.21%
 http/create-clientrequest.js e=1 arg='string' url='wpt'                              *      0.83 %      ±0.79% ±1.05% ±1.37%
 http/create-clientrequest.js e=1 arg='URL' url='idn'                                        0.72 %      ±0.77% ±1.02% ±1.33%
 http/create-clientrequest.js e=1 arg='URL' url='long'                              ***      1.36 %      ±0.62% ±0.82% ±1.07%
 http/create-clientrequest.js e=1 arg='URL' url='wpt'                                 *      1.18 %      ±0.99% ±1.32% ±1.72%

Checklist

make -j4 test (UNIX), or vcbuild test (Windows) passes
tests and/or benchmarks are included
commit message follows commit guidelines

Now we are using `output`, `outputEncodings` and `outputCallbacks` to hold pending data. Reducing them into one array `outputData` can slightly improve performance and reduce some redundant codes.

nodejs-github-bot · 2019-02-08T06:11:22Z

@starkwang build started: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/2544/pipeline

starkwang · 2019-02-08T06:12:06Z

CI: https://ci.nodejs.org/job/node-test-pull-request/20662/

bnoordhuis

LGTM. You might get even better performance if you push the data, encoding and callback properties as elements instead of wrapped in an object.

I stress the 'might' because it's not a dead certainty but I'm fairly certain it will. One performance pitfall to be aware of: destructuring assignment from an array (vis-a-vis an object) is quite slow in V8 right now.

mscdex · 2019-02-08T06:40:44Z

I think that's the wrong benchmark to be checking. create-clientrequest just measures creating ClientRequest objects. You will need to run benchmarks that actually send/receive requests/responses to measure the effects of the bulk of the code changes here.

starkwang · 2019-02-08T07:38:00Z

I think that's the wrong benchmark to be checking. create-clientrequest just measures creating ClientRequest objects. You will need to run benchmarks that actually send/receive requests/responses.

@mscdex I'm now running the whole benchmarks for http module. I'll paste the result after it finishes.

starkwang · 2019-02-08T15:49:11Z

Here is the whole benchmark result. It seems no difference after change (except create-clientrequest):

                                                                                               confidence improvement accuracy (*)    (**)   (***)
 http/bench-parser.js n=100000 len=16                                                                          0.22 %      ±0.57% ±0.76% ±1.00%
 http/bench-parser.js n=100000 len=32                                                                          0.08 %      ±0.27% ±0.36% ±0.47%
 http/bench-parser.js n=100000 len=4                                                                          -0.08 %      ±0.43% ±0.57% ±0.74%
 http/bench-parser.js n=100000 len=8                                                                   **      0.61 %      ±0.38% ±0.50% ±0.65%
 http/check_invalid_header_char.js n=1000000 input=''                                                   *     -0.69 %      ±0.58% ±0.78% ±1.02%
 http/check_invalid_header_char.js n=1000000 input='\177'                                                      0.45 %      ±0.64% ±0.85% ±1.11%
 http/check_invalid_header_char.js n=1000000 input='\\t\\t\\t\\t\\t\\t\\t\\t\\t\\tFoo bar baz'                -0.36 %      ±0.49% ±0.65% ±0.85%
 http/check_invalid_header_char.js n=1000000 input='1'                                                        -0.02 %      ±0.90% ±1.20% ±1.56%
 http/check_invalid_header_char.js n=1000000 input='20091'                                                     0.35 %      ±0.59% ±0.79% ±1.03%
 http/check_invalid_header_char.js n=1000000 input='中文呢'                                             *      0.59 %      ±0.59% ±0.78% ±1.01%
 http/check_invalid_header_char.js n=1000000 input='close'                                                     0.51 %      ±0.90% ±1.20% ±1.57%
 http/check_invalid_header_char.js n=1000000 input='en-US'                                                    -0.09 %      ±0.79% ±1.05% ±1.38%
 http/check_invalid_header_char.js n=1000000 input='foo\\nbar'                                                 0.15 %      ±0.64% ±0.85% ±1.10%
 http/check_invalid_header_char.js n=1000000 input='group_acmeair'                                      *     -0.41 %      ±0.37% ±0.49% ±0.64%
 http/check_invalid_header_char.js n=1000000 input='gzip'                                                      0.25 %      ±0.79% ±1.06% ±1.38%
 http/check_invalid_header_char.js n=1000000 input='keep-alive'                                                0.23 %      ±0.56% ±0.74% ±0.97%
 http/check_invalid_header_char.js n=1000000 input='LONG_AND_INVALID'                                         -0.11 %      ±0.37% ±0.49% ±0.64%
 http/check_invalid_header_char.js n=1000000 input='private'                                                  -0.08 %      ±0.68% ±0.91% ±1.18%
 http/check_invalid_header_char.js n=1000000 input='SAMEORIGIN'                                               -0.31 %      ±0.73% ±0.98% ±1.28%
 http/check_invalid_header_char.js n=1000000 input='Sat, 07 May 2016 16:54:48 GMT'                            -0.28 %      ±0.43% ±0.57% ±0.74%
 http/check_invalid_header_char.js n=1000000 input='text/html; charset=utf-8'                                 -0.05 %      ±0.44% ±0.58% ±0.75%
 http/check_invalid_header_char.js n=1000000 input='text/plain'                                        **     -0.89 %      ±0.56% ±0.75% ±0.97%
 http/check_is_http_token.js n=1000000 key=':'                                                                -0.10 %      ±0.64% ±0.85% ±1.11%
 http/check_is_http_token.js n=1000000 key=':alternate-protocol'                                              -0.24 %      ±0.62% ±0.83% ±1.09%
 http/check_is_http_token.js n=1000000 key='((((())))'                                                        -0.41 %      ±0.70% ±0.94% ±1.22%
 http/check_is_http_token.js n=1000000 key='@@'                                                                0.25 %      ±0.45% ±0.59% ±0.77%
 http/check_is_http_token.js n=1000000 key='中文呢'                                                            0.25 %      ±0.59% ±0.78% ±1.02%
 http/check_is_http_token.js n=1000000 key='Accept-Ranges'                                                     0.35 %      ±0.76% ±1.01% ±1.32%
 http/check_is_http_token.js n=1000000 key='alt-svc'                                                          -0.19 %      ±0.91% ±1.21% ±1.57%
 http/check_is_http_token.js n=1000000 key='alternate-protocol:'                                              -0.10 %      ±0.34% ±0.45% ±0.59%
 http/check_is_http_token.js n=1000000 key='alternate-protocol'                                               -0.46 %      ±0.95% ±1.27% ±1.65%
 http/check_is_http_token.js n=1000000 key='Cache-Control'                                                     0.22 %      ±0.81% ±1.08% ±1.41%
 http/check_is_http_token.js n=1000000 key='Connection'                                                        0.20 %      ±0.75% ±1.00% ±1.31%
 http/check_is_http_token.js n=1000000 key='Content-Encoding'                                                  0.16 %      ±0.82% ±1.09% ±1.41%
 http/check_is_http_token.js n=1000000 key='content-length'                                                    0.40 %      ±0.87% ±1.16% ±1.51%
 http/check_is_http_token.js n=1000000 key='Content-Location'                                                 -0.28 %      ±0.93% ±1.24% ±1.61%
 http/check_is_http_token.js n=1000000 key='content-type'                                                     -0.07 %      ±0.81% ±1.08% ±1.40%
 http/check_is_http_token.js n=1000000 key='Content-Type'                                                     -0.40 %      ±0.76% ±1.01% ±1.31%
 http/check_is_http_token.js n=1000000 key='date'                                                             -0.58 %      ±0.79% ±1.05% ±1.37%
 http/check_is_http_token.js n=1000000 key='ETag'                                                             -0.25 %      ±0.85% ±1.12% ±1.46%
 http/check_is_http_token.js n=1000000 key='Expires'                                                           0.32 %      ±1.15% ±1.54% ±2.01%
 http/check_is_http_token.js n=1000000 key='Keep-Alive'                                                       -0.18 %      ±0.83% ±1.11% ±1.44%
 http/check_is_http_token.js n=1000000 key='Last-Modified'                                                    -0.48 %      ±0.79% ±1.05% ±1.37%
 http/check_is_http_token.js n=1000000 key='location'                                                          0.09 %      ±0.92% ±1.23% ±1.60%
 http/check_is_http_token.js n=1000000 key='server'                                                            0.05 %      ±0.74% ±0.98% ±1.28%
 http/check_is_http_token.js n=1000000 key='Server'                                                            0.34 %      ±0.67% ±0.90% ±1.17%
 http/check_is_http_token.js n=1000000 key='status'                                                            0.01 %      ±0.88% ±1.17% ±1.52%
 http/check_is_http_token.js n=1000000 key='TCN'                                                              -0.38 %      ±0.77% ±1.03% ±1.34%
 http/check_is_http_token.js n=1000000 key='Transfer-Encoding'                                                 1.00 %      ±1.00% ±1.33% ±1.74%
 http/check_is_http_token.js n=1000000 key='Vary'                                                              0.48 %      ±1.16% ±1.54% ±2.02%
 http/check_is_http_token.js n=1000000 key='version'                                                          -0.44 %      ±0.78% ±1.04% ±1.35%
 http/check_is_http_token.js n=1000000 key='x-frame-options'                                                   0.14 %      ±0.99% ±1.32% ±1.72%
 http/check_is_http_token.js n=1000000 key='x-xss-protection'                                                 -0.00 %      ±0.92% ±1.22% ±1.59%
 http/chunked.js c=100 len=1 n=1 benchmarker='autocannon'                                                      0.50 %      ±1.28% ±1.71% ±2.24%
 http/chunked.js c=100 len=1 n=16 benchmarker='autocannon'                                                     1.01 %      ±2.12% ±2.82% ±3.68%
 http/chunked.js c=100 len=1 n=4 benchmarker='autocannon'                                                      0.97 %      ±2.99% ±3.98% ±5.18%
 http/chunked.js c=100 len=1 n=8 benchmarker='autocannon'                                                      1.02 %      ±1.95% ±2.59% ±3.38%
 http/chunked.js c=100 len=256 n=1 benchmarker='autocannon'                                                    0.72 %      ±1.07% ±1.42% ±1.85%
 http/chunked.js c=100 len=256 n=16 benchmarker='autocannon'                                                   0.31 %      ±1.62% ±2.16% ±2.81%
 http/chunked.js c=100 len=256 n=4 benchmarker='autocannon'                                                    0.12 %      ±4.56% ±6.06% ±7.89%
 http/chunked.js c=100 len=256 n=8 benchmarker='autocannon'                                                   -0.62 %      ±1.63% ±2.17% ±2.83%
 http/chunked.js c=100 len=64 n=1 benchmarker='autocannon'                                                     0.33 %      ±1.10% ±1.46% ±1.91%
 http/chunked.js c=100 len=64 n=16 benchmarker='autocannon'                                                    0.77 %      ±1.56% ±2.08% ±2.71%
 http/chunked.js c=100 len=64 n=4 benchmarker='autocannon'                                                     1.50 %      ±4.25% ±5.65% ±7.36%
 http/chunked.js c=100 len=64 n=8 benchmarker='autocannon'                                                     0.81 %      ±1.55% ±2.07% ±2.70%
 http/client-request-body.js method='end' len=1024 type='asc' dur=5                                           -0.03 %      ±0.52% ±0.69% ±0.90%
 http/client-request-body.js method='end' len=1024 type='buf' dur=5                                            0.11 %      ±0.79% ±1.05% ±1.37%
 http/client-request-body.js method='end' len=1024 type='utf' dur=5                                            0.09 %      ±0.74% ±0.99% ±1.29%
 http/client-request-body.js method='end' len=256 type='asc' dur=5                                            -0.29 %      ±0.90% ±1.20% ±1.58%
 http/client-request-body.js method='end' len=256 type='buf' dur=5                                            -0.04 %      ±0.65% ±0.86% ±1.13%
 http/client-request-body.js method='end' len=256 type='utf' dur=5                                             0.49 %      ±0.80% ±1.06% ±1.38%
 http/client-request-body.js method='end' len=32 type='asc' dur=5                                       *      0.83 %      ±0.71% ±0.95% ±1.24%
 http/client-request-body.js method='end' len=32 type='buf' dur=5                                              0.23 %      ±0.65% ±0.86% ±1.12%
 http/client-request-body.js method='end' len=32 type='utf' dur=5                                             -0.21 %      ±0.61% ±0.82% ±1.07%
 http/client-request-body.js method='write' len=1024 type='asc' dur=5                                          0.50 %      ±0.58% ±0.78% ±1.01%
 http/client-request-body.js method='write' len=1024 type='buf' dur=5                                         -0.18 %      ±0.80% ±1.07% ±1.39%
 http/client-request-body.js method='write' len=1024 type='utf' dur=5                                          0.16 %      ±0.63% ±0.84% ±1.09%
 http/client-request-body.js method='write' len=256 type='asc' dur=5                                           0.02 %      ±0.72% ±0.96% ±1.24%
 http/client-request-body.js method='write' len=256 type='buf' dur=5                                           0.49 %      ±0.55% ±0.73% ±0.95%
 http/client-request-body.js method='write' len=256 type='utf' dur=5                                           0.43 %      ±0.56% ±0.75% ±0.97%
 http/client-request-body.js method='write' len=32 type='asc' dur=5                                           -0.09 %      ±0.62% ±0.82% ±1.07%
 http/client-request-body.js method='write' len=32 type='buf' dur=5                                           -0.43 %      ±0.59% ±0.79% ±1.02%
 http/client-request-body.js method='write' len=32 type='utf' dur=5                                           -0.24 %      ±0.54% ±0.71% ±0.93%
 http/cluster.js c=50 len=1024 type='buffer' benchmarker='autocannon'                                   *      3.31 %      ±2.84% ±3.78% ±4.92%
 http/cluster.js c=50 len=1024 type='bytes' benchmarker='autocannon'                                          -0.96 %      ±2.45% ±3.26% ±4.26%
 http/cluster.js c=50 len=102400 type='buffer' benchmarker='autocannon'                                       -0.15 %      ±1.44% ±1.92% ±2.50%
 http/cluster.js c=50 len=102400 type='bytes' benchmarker='autocannon'                                        -0.24 %      ±2.40% ±3.19% ±4.15%
 http/cluster.js c=50 len=4 type='buffer' benchmarker='autocannon'                                            -1.98 %      ±2.42% ±3.23% ±4.21%
 http/cluster.js c=50 len=4 type='bytes' benchmarker='autocannon'                                             -1.29 %      ±2.73% ±3.63% ±4.74%
 http/cluster.js c=500 len=1024 type='buffer' benchmarker='autocannon'                                         1.19 %      ±2.87% ±3.82% ±4.97%
 http/cluster.js c=500 len=1024 type='bytes' benchmarker='autocannon'                                   *     -3.14 %      ±2.86% ±3.81% ±4.97%
 http/cluster.js c=500 len=102400 type='buffer' benchmarker='autocannon'                                       0.58 %      ±1.81% ±2.41% ±3.14%
 http/cluster.js c=500 len=102400 type='bytes' benchmarker='autocannon'                                       -2.01 %      ±2.01% ±2.68% ±3.50%
 http/cluster.js c=500 len=4 type='buffer' benchmarker='autocannon'                                            1.73 %      ±2.30% ±3.06% ±3.99%
 http/cluster.js c=500 len=4 type='bytes' benchmarker='autocannon'                                            -0.18 %      ±2.09% ±2.79% ±3.63%
 http/create-clientrequest.js e=1 arg='options' url='idn'                                             ***      2.72 %      ±0.93% ±1.23% ±1.61%
 http/create-clientrequest.js e=1 arg='options' url='long'                                            ***      1.91 %      ±1.07% ±1.42% ±1.85%
 http/create-clientrequest.js e=1 arg='options' url='wpt'                                             ***      2.61 %      ±1.33% ±1.77% ±2.30%
 http/create-clientrequest.js e=1 arg='string' url='idn'                                                *      0.79 %      ±0.69% ±0.92% ±1.20%
 http/create-clientrequest.js e=1 arg='string' url='long'                                                      0.54 %      ±0.69% ±0.92% ±1.21%
 http/create-clientrequest.js e=1 arg='string' url='wpt'                                                *      0.83 %      ±0.79% ±1.05% ±1.37%
 http/create-clientrequest.js e=1 arg='URL' url='idn'                                                          0.72 %      ±0.77% ±1.02% ±1.33%
 http/create-clientrequest.js e=1 arg='URL' url='long'                                                ***      1.36 %      ±0.62% ±0.82% ±1.07%
 http/create-clientrequest.js e=1 arg='URL' url='wpt'                                                   *      1.18 %      ±0.99% ±1.32% ±1.72%
 http/end-vs-write-end.js method='end' c=100 len=1048576 type='asc' benchmarker='autocannon'                  -0.16 %      ±1.25% ±1.66% ±2.16%
 http/end-vs-write-end.js method='end' c=100 len=1048576 type='buf' benchmarker='autocannon'                   0.29 %      ±1.49% ±1.98% ±2.58%
 http/end-vs-write-end.js method='end' c=100 len=1048576 type='utf' benchmarker='autocannon'                  -0.24 %      ±0.74% ±0.98% ±1.28%
 http/end-vs-write-end.js method='end' c=100 len=131072 type='asc' benchmarker='autocannon'             *      0.18 %      ±0.14% ±0.19% ±0.25%
 http/end-vs-write-end.js method='end' c=100 len=131072 type='buf' benchmarker='autocannon'                   -0.62 %      ±0.73% ±0.98% ±1.27%
 http/end-vs-write-end.js method='end' c=100 len=131072 type='utf' benchmarker='autocannon'                    0.06 %      ±0.21% ±0.29% ±0.38%
 http/end-vs-write-end.js method='end' c=100 len=262144 type='asc' benchmarker='autocannon'                    0.14 %      ±0.19% ±0.25% ±0.32%
 http/end-vs-write-end.js method='end' c=100 len=262144 type='buf' benchmarker='autocannon'                    0.10 %      ±1.32% ±1.76% ±2.29%
 http/end-vs-write-end.js method='end' c=100 len=262144 type='utf' benchmarker='autocannon'                   -0.34 %      ±0.55% ±0.74% ±0.97%
 http/end-vs-write-end.js method='end' c=100 len=65536 type='asc' benchmarker='autocannon'              *      0.31 %      ±0.23% ±0.31% ±0.41%
 http/end-vs-write-end.js method='end' c=100 len=65536 type='buf' benchmarker='autocannon'                     0.30 %      ±0.59% ±0.78% ±1.02%
 http/end-vs-write-end.js method='end' c=100 len=65536 type='utf' benchmarker='autocannon'                     0.13 %      ±0.35% ±0.47% ±0.61%
 http/end-vs-write-end.js method='write' c=100 len=1048576 type='asc' benchmarker='autocannon'                 0.06 %      ±2.25% ±2.99% ±3.89%
 http/end-vs-write-end.js method='write' c=100 len=1048576 type='buf' benchmarker='autocannon'                -0.41 %      ±1.21% ±1.61% ±2.10%
 http/end-vs-write-end.js method='write' c=100 len=1048576 type='utf' benchmarker='autocannon'                 0.03 %      ±1.06% ±1.41% ±1.83%
 http/end-vs-write-end.js method='write' c=100 len=131072 type='asc' benchmarker='autocannon'                  0.01 %      ±0.15% ±0.20% ±0.26%
 http/end-vs-write-end.js method='write' c=100 len=131072 type='buf' benchmarker='autocannon'                 -0.04 %      ±0.55% ±0.73% ±0.95%
 http/end-vs-write-end.js method='write' c=100 len=131072 type='utf' benchmarker='autocannon'                 -0.09 %      ±0.19% ±0.26% ±0.33%
 http/end-vs-write-end.js method='write' c=100 len=262144 type='asc' benchmarker='autocannon'                 -0.06 %      ±0.20% ±0.26% ±0.34%
 http/end-vs-write-end.js method='write' c=100 len=262144 type='buf' benchmarker='autocannon'                  0.11 %      ±0.86% ±1.15% ±1.50%
 http/end-vs-write-end.js method='write' c=100 len=262144 type='utf' benchmarker='autocannon'                 -0.11 %      ±0.20% ±0.26% ±0.34%
 http/end-vs-write-end.js method='write' c=100 len=65536 type='asc' benchmarker='autocannon'                  -0.06 %      ±0.23% ±0.30% ±0.40%
 http/end-vs-write-end.js method='write' c=100 len=65536 type='buf' benchmarker='autocannon'                  -0.11 %      ±0.49% ±0.66% ±0.85%
 http/end-vs-write-end.js method='write' c=100 len=65536 type='utf' benchmarker='autocannon'                  -0.40 %      ±0.59% ±0.79% ±1.04%
 http/headers.js n=10 duplicates=1 benchmarker='autocannon'                                                    0.15 %      ±0.54% ±0.72% ±0.94%
 http/headers.js n=10 duplicates=100 benchmarker='autocannon'                                                 -0.60 %      ±0.84% ±1.12% ±1.46%
 http/headers.js n=1000 duplicates=1 benchmarker='autocannon'                                                  0.07 %      ±0.34% ±0.46% ±0.59%
 http/headers.js n=1000 duplicates=100 benchmarker='autocannon'                                                0.42 %      ±0.64% ±0.86% ±1.13%
 http/simple.js chunkedEnc=0 c=50 chunks=1 len=1024 type='buffer' benchmarker='autocannon'                     0.79 %      ±2.05% ±2.73% ±3.55%
 http/simple.js chunkedEnc=0 c=50 chunks=1 len=1024 type='bytes' benchmarker='autocannon'                      0.37 %      ±2.55% ±3.40% ±4.42%
 http/simple.js chunkedEnc=0 c=50 chunks=1 len=102400 type='buffer' benchmarker='autocannon'                  -0.10 %      ±1.15% ±1.53% ±2.00%
 http/simple.js chunkedEnc=0 c=50 chunks=1 len=102400 type='bytes' benchmarker='autocannon'                    0.07 %      ±0.44% ±0.58% ±0.76%
 http/simple.js chunkedEnc=0 c=50 chunks=1 len=4 type='buffer' benchmarker='autocannon'                 *      1.02 %      ±0.87% ±1.15% ±1.50%
 http/simple.js chunkedEnc=0 c=50 chunks=1 len=4 type='bytes' benchmarker='autocannon'                         0.77 %      ±1.28% ±1.71% ±2.23%
 http/simple.js chunkedEnc=0 c=50 chunks=4 len=1024 type='buffer' benchmarker='autocannon'                     1.01 %      ±2.13% ±2.84% ±3.70%
 http/simple.js chunkedEnc=0 c=50 chunks=4 len=1024 type='bytes' benchmarker='autocannon'                     -0.22 %      ±1.80% ±2.40% ±3.12%
 http/simple.js chunkedEnc=0 c=50 chunks=4 len=102400 type='buffer' benchmarker='autocannon'                  -0.00 %      ±1.38% ±1.84% ±2.39%
 http/simple.js chunkedEnc=0 c=50 chunks=4 len=102400 type='bytes' benchmarker='autocannon'                   -0.03 %      ±0.38% ±0.50% ±0.66%
 http/simple.js chunkedEnc=0 c=50 chunks=4 len=4 type='buffer' benchmarker='autocannon'                        0.68 %      ±0.99% ±1.31% ±1.71%
 http/simple.js chunkedEnc=0 c=50 chunks=4 len=4 type='bytes' benchmarker='autocannon'                        -0.52 %      ±0.85% ±1.14% ±1.48%
 http/simple.js chunkedEnc=0 c=500 chunks=1 len=1024 type='buffer' benchmarker='autocannon'                    0.86 %      ±2.00% ±2.67% ±3.47%
 http/simple.js chunkedEnc=0 c=500 chunks=1 len=1024 type='bytes' benchmarker='autocannon'                     1.37 %      ±1.86% ±2.48% ±3.23%
 http/simple.js chunkedEnc=0 c=500 chunks=1 len=102400 type='buffer' benchmarker='autocannon'                 -0.26 %      ±0.96% ±1.28% ±1.67%
 http/simple.js chunkedEnc=0 c=500 chunks=1 len=102400 type='bytes' benchmarker='autocannon'                  -0.05 %      ±0.68% ±0.90% ±1.18%
 http/simple.js chunkedEnc=0 c=500 chunks=1 len=4 type='buffer' benchmarker='autocannon'                       0.54 %      ±1.00% ±1.33% ±1.74%
 http/simple.js chunkedEnc=0 c=500 chunks=1 len=4 type='bytes' benchmarker='autocannon'                        0.38 %      ±0.99% ±1.32% ±1.72%
 http/simple.js chunkedEnc=0 c=500 chunks=4 len=1024 type='buffer' benchmarker='autocannon'                    0.20 %      ±1.96% ±2.61% ±3.40%
 http/simple.js chunkedEnc=0 c=500 chunks=4 len=1024 type='bytes' benchmarker='autocannon'                    -0.63 %      ±2.05% ±2.73% ±3.55%
 http/simple.js chunkedEnc=0 c=500 chunks=4 len=102400 type='buffer' benchmarker='autocannon'                  0.56 %      ±1.00% ±1.33% ±1.73%
 http/simple.js chunkedEnc=0 c=500 chunks=4 len=102400 type='bytes' benchmarker='autocannon'                   1.02 %      ±1.25% ±1.68% ±2.23%
 http/simple.js chunkedEnc=0 c=500 chunks=4 len=4 type='buffer' benchmarker='autocannon'                       0.04 %      ±1.34% ±1.79% ±2.34%
 http/simple.js chunkedEnc=0 c=500 chunks=4 len=4 type='bytes' benchmarker='autocannon'                        0.08 %      ±1.12% ±1.49% ±1.94%
 http/simple.js chunkedEnc=1 c=50 chunks=1 len=1024 type='buffer' benchmarker='autocannon'                    -0.09 %      ±2.12% ±2.82% ±3.67%
 http/simple.js chunkedEnc=1 c=50 chunks=1 len=1024 type='bytes' benchmarker='autocannon'                      0.67 %      ±1.99% ±2.64% ±3.44%
 http/simple.js chunkedEnc=1 c=50 chunks=1 len=102400 type='buffer' benchmarker='autocannon'                  -0.12 %      ±1.39% ±1.85% ±2.41%
 http/simple.js chunkedEnc=1 c=50 chunks=1 len=102400 type='bytes' benchmarker='autocannon'                    0.09 %      ±0.38% ±0.50% ±0.66%
 http/simple.js chunkedEnc=1 c=50 chunks=1 len=4 type='buffer' benchmarker='autocannon'                        0.11 %      ±1.07% ±1.42% ±1.85%
 http/simple.js chunkedEnc=1 c=50 chunks=1 len=4 type='bytes' benchmarker='autocannon'                        -0.58 %      ±0.98% ±1.31% ±1.71%
 http/simple.js chunkedEnc=1 c=50 chunks=4 len=1024 type='buffer' benchmarker='autocannon'                    -0.15 %      ±1.88% ±2.51% ±3.27%
 http/simple.js chunkedEnc=1 c=50 chunks=4 len=1024 type='bytes' benchmarker='autocannon'                     -0.25 %      ±1.94% ±2.59% ±3.37%
 http/simple.js chunkedEnc=1 c=50 chunks=4 len=102400 type='buffer' benchmarker='autocannon'                  -0.49 %      ±1.30% ±1.73% ±2.25%
 http/simple.js chunkedEnc=1 c=50 chunks=4 len=102400 type='bytes' benchmarker='autocannon'                   -0.22 %      ±0.57% ±0.77% ±1.00%
 http/simple.js chunkedEnc=1 c=50 chunks=4 len=4 type='buffer' benchmarker='autocannon'                        0.49 %      ±1.39% ±1.85% ±2.40%
 http/simple.js chunkedEnc=1 c=50 chunks=4 len=4 type='bytes' benchmarker='autocannon'                        -0.30 %      ±0.96% ±1.28% ±1.67%
 http/simple.js chunkedEnc=1 c=500 chunks=1 len=1024 type='buffer' benchmarker='autocannon'                    1.16 %      ±1.64% ±2.18% ±2.84%
 http/simple.js chunkedEnc=1 c=500 chunks=1 len=1024 type='bytes' benchmarker='autocannon'                     0.95 %      ±1.74% ±2.32% ±3.02%
 http/simple.js chunkedEnc=1 c=500 chunks=1 len=102400 type='buffer' benchmarker='autocannon'           *      1.27 %      ±1.02% ±1.36% ±1.78%
 http/simple.js chunkedEnc=1 c=500 chunks=1 len=102400 type='bytes' benchmarker='autocannon'                   0.21 %      ±0.78% ±1.04% ±1.36%
 http/simple.js chunkedEnc=1 c=500 chunks=1 len=4 type='buffer' benchmarker='autocannon'                       0.80 %      ±0.94% ±1.25% ±1.64%
 http/simple.js chunkedEnc=1 c=500 chunks=1 len=4 type='bytes' benchmarker='autocannon'                        0.16 %      ±0.72% ±0.96% ±1.25%
 http/simple.js chunkedEnc=1 c=500 chunks=4 len=1024 type='buffer' benchmarker='autocannon'                   -0.51 %      ±1.97% ±2.62% ±3.41%
 http/simple.js chunkedEnc=1 c=500 chunks=4 len=1024 type='bytes' benchmarker='autocannon'                     1.74 %      ±2.03% ±2.70% ±3.52%
 http/simple.js chunkedEnc=1 c=500 chunks=4 len=102400 type='buffer' benchmarker='autocannon'                  0.42 %      ±0.89% ±1.18% ±1.54%
 http/simple.js chunkedEnc=1 c=500 chunks=4 len=102400 type='bytes' benchmarker='autocannon'                   0.32 %      ±0.58% ±0.78% ±1.02%
 http/simple.js chunkedEnc=1 c=500 chunks=4 len=4 type='buffer' benchmarker='autocannon'                      -0.30 %      ±1.40% ±1.87% ±2.46%
 http/simple.js chunkedEnc=1 c=500 chunks=4 len=4 type='bytes' benchmarker='autocannon'                       -0.33 %      ±0.70% ±0.94% ±1.22%

Be aware that when doing many comparisons the risk of a false-positive
result increases. In this case there are 180 comparisons, you can thus
expect the following amount of false-positive results:
  9.00 false positives, when considering a   5% risk acceptance (*, **, ***),
  1.80 false positives, when considering a   1% risk acceptance (**, ***),
  0.18 false positives, when considering a 0.1% risk acceptance (***)

lpinca · 2019-02-08T16:45:16Z

lib/_http_outgoing.js

  socket.cork();
-  for (var i = 0; i < outputLength; i++) {
-    ret = socket.write(output[i], outputEncodings[i], outputCallbacks[i]);
+  for (var i = 0; i < outputData.length; i++) {


Suggested change

for (var i = 0; i < outputData.length; i++) {

for (var i = 0; i < outputLength; i++) {

starkwang · 2019-02-10T14:36:50Z

CI before landing: https://ci.nodejs.org/job/node-test-pull-request/20710/

starkwang · 2019-02-11T05:37:00Z

Landed in 0b58545

Now we are using `output`, `outputEncodings` and `outputCallbacks` to hold pending data. Reducing them into one array `outputData` can slightly improve performance and reduce some redundant codes. PR-URL: #26004 Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Minwoo Jung <[email protected]>

http: reduce multiple output arrays into one

bde8a92

Now we are using `output`, `outputEncodings` and `outputCallbacks` to hold pending data. Reducing them into one array `outputData` can slightly improve performance and reduce some redundant codes.

nodejs-github-bot added the http Issues or PRs related to the http subsystem. label Feb 8, 2019

bnoordhuis approved these changes Feb 8, 2019

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lpinca approved these changes Feb 8, 2019

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[squash] using outputLength

89a723c

JungMinu approved these changes Feb 9, 2019

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starkwang closed this Feb 11, 2019

targos mentioned this pull request Feb 14, 2019

v11.10.0 proposal #26098

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	for (var i = 0; i < outputData.length; i++) {
	for (var i = 0; i < outputLength; i++) {

http: reduce multiple output arrays into one #26004

http: reduce multiple output arrays into one #26004

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