stream: improve readable stream read perf
Performance improvement for readable.read by around ~10%
Benchmarks
confidence improvement accuracy (*) (**) (***)
streams/creation.js kind='duplex' n=50000000 0.05 % ±1.22% ±1.62% ±2.12%
streams/creation.js kind='readable' n=50000000 -1.00 % ±1.12% ±1.49% ±1.95%
streams/creation.js kind='transform' n=50000000 2.30 % ±4.02% ±5.35% ±6.96%
streams/creation.js kind='writable' n=50000000 -0.14 % ±0.90% ±1.20% ±1.57%
streams/destroy.js kind='duplex' n=1000000 -1.51 % ±1.88% ±2.50% ±3.25%
streams/destroy.js kind='readable' n=1000000 -1.95 % ±2.02% ±2.69% ±3.51%
streams/destroy.js kind='transform' n=1000000 -0.28 % ±1.45% ±1.93% ±2.51%
streams/destroy.js kind='writable' n=1000000 -0.03 % ±2.02% ±2.69% ±3.50%
streams/pipe-object-mode.js n=5000000 1.40 % ±3.61% ±4.81% ±6.26%
streams/pipe.js n=5000000 -0.57 % ±2.60% ±3.47% ±4.53%
streams/readable-async-iterator.js sync='no' n=100000 1.39 % ±3.39% ±4.55% ±6.01%
streams/readable-async-iterator.js sync='yes' n=100000 -1.66 % ±2.95% ±3.97% ±5.25%
streams/readable-bigread.js n=1000 -0.36 % ±7.13% ±9.49% ±12.35%
streams/readable-bigunevenread.js n=1000 0.72 % ±1.64% ±2.18% ±2.84%
streams/readable-boundaryread.js type='buffer' n=2000 *** 6.36 % ±1.25% ±1.67% ±2.17%
streams/readable-boundaryread.js type='string' n=2000 *** 2.66 % ±1.42% ±1.90% ±2.49%
streams/readable-from.js n=10000000 -4.26 % ±8.28% ±11.05% ±14.45%
streams/readable-readall.js n=5000 *** 10.08 % ±5.50% ±7.33% ±9.57%
streams/readable-unevenread.js n=1000 -0.15 % ±2.90% ±3.86% ±5.02%
streams/writable-manywrites.js len=1024 callback='no' writev='no' sync='no' n=100000 -0.37 % ±3.01% ±4.01% ±5.22%
streams/writable-manywrites.js len=1024 callback='no' writev='no' sync='yes' n=100000 0.54 % ±2.45% ±3.26% ±4.25%
streams/writable-manywrites.js len=1024 callback='no' writev='yes' sync='no' n=100000 -0.02 % ±2.75% ±3.68% ±4.82%
streams/writable-manywrites.js len=1024 callback='no' writev='yes' sync='yes' n=100000 0.35 % ±2.39% ±3.18% ±4.14%
streams/writable-manywrites.js len=1024 callback='yes' writev='no' sync='no' n=100000 0.78 % ±2.31% ±3.11% ±4.11%
streams/writable-manywrites.js len=1024 callback='yes' writev='no' sync='yes' n=100000 * 2.81 % ±2.52% ±3.36% ±4.37%
streams/writable-manywrites.js len=1024 callback='yes' writev='yes' sync='no' n=100000 * -2.73 % ±2.48% ±3.29% ±4.29%
streams/writable-manywrites.js len=1024 callback='yes' writev='yes' sync='yes' n=100000 -1.59 % ±2.34% ±3.12% ±4.06%
streams/writable-manywrites.js len=32768 callback='no' writev='no' sync='no' n=100000 -1.57 % ±2.72% ±3.66% ±4.83%
streams/writable-manywrites.js len=32768 callback='no' writev='no' sync='yes' n=100000 -0.27 % ±2.67% ±3.55% ±4.62%
streams/writable-manywrites.js len=32768 callback='no' writev='yes' sync='no' n=100000 -2.95 % ±3.00% ±4.03% ±5.32%
streams/writable-manywrites.js len=32768 callback='no' writev='yes' sync='yes' n=100000 0.94 % ±2.69% ±3.57% ±4.65%
streams/writable-manywrites.js len=32768 callback='yes' writev='no' sync='no' n=100000 -0.42 % ±2.25% ±3.01% ±3.96%
streams/writable-manywrites.js len=32768 callback='yes' writev='no' sync='yes' n=100000 0.03 % ±2.43% ±3.23% ±4.20%
streams/writable-manywrites.js len=32768 callback='yes' writev='yes' sync='no' n=100000 0.18 % ±2.33% ±3.12% ±4.13%
streams/writable-manywrites.js len=32768 callback='yes' writev='yes' sync='yes' n=100000 -0.37 % ±2.42% ±3.22% ±4.19%
Be aware that when doing many comparisons the risk of a false-positive
result increases. In this case, there are 35 comparisons, you can thus
expect the following amount of false-positive results:
1.75 false positives, when considering a 5% risk acceptance (*, **, ***),
0.35 false positives, when considering a 1% risk acceptance (**, ***),
0.04 false positives, when considering a 0.1% risk acceptance (***)