buffer: improve Buffer.equals performance

[kylo5aby]

improve Buffer.equals performance:

 confidence improvement accuracy (*) (**) (***) buffers/buffer-equals.js n=1000000 difflen='false' size=0 *** 147.60 % ±1.94% ±2.58% ±3.37% buffers/buffer-equals.js n=1000000 difflen='false' size=16386 *** 5.47 % ±2.92% ±3.93% ±5.22% buffers/buffer-equals.js n=1000000 difflen='false' size=512 *** 34.73 % ±0.85% ±1.13% ±1.48% buffers/buffer-equals.js n=1000000 difflen='true' size=0 *** 82.37 % ±3.70% ±4.98% ±6.60% buffers/buffer-equals.js n=1000000 difflen='true' size=16386 *** 85.01 % ±1.84% ±2.45% ±3.19% buffers/buffer-equals.js n=1000000 difflen='true' size=512 *** 82.84 % ±3.14% ±4.20% ±5.53%

As mentioned in #50620 , the performance regression of Buffer.byteLength might be due
to ArrayBufferView.byteLength, reduce the property access of Buffer.byteLength
helps to reduce regression for Buffer.equals

Inspired by the comment from @aduh95, using TypedArrayPrototypeGetByteLength
also improves performance.

Refs: #50620

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/55489/

[aduh95]

Could you try with TypedArrayPrototypeGetByteLength from primordials? I'd be curious to see if that would improve perf further or not.

[kylo5aby]

Good suggestion. I have tried TypedArrayPrototypeGetByteLength. As you can see in the updated benchmark result, it improved a lot.

[aduh95]

Benchmark CI: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1470/

Results

confidence improvement accuracy (*) (**) (***) buffers/buffer-base64-decode-wrapped.js n=32 linesCount=524288 charsPerLine=76 -0.20 % ±0.58% ±0.78% ±1.01% buffers/buffer-base64-decode.js size=8388608 n=32 0.07 % ±0.86% ±1.14% ±1.49% buffers/buffer-base64-encode.js n=32 len=67108864 0.37 % ±1.20% ±1.60% ±2.08% buffers/buffer-base64url-decode.js size=8388608 n=32 0.38 % ±0.70% ±0.93% ±1.21% buffers/buffer-base64url-encode.js n=32 len=67108864 -0.01 % ±0.37% ±0.49% ±0.63% buffers/buffer-bytelength-buffer.js n=4000000 len=16 -2.14 % ±10.08% ±13.41% ±17.45% buffers/buffer-bytelength-buffer.js n=4000000 len=2 -4.59 % ±9.36% ±12.46% ±16.23% buffers/buffer-bytelength-buffer.js n=4000000 len=256 0.17 % ±9.88% ±13.15% ±17.12% buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='four_bytes' -1.73 % ±4.99% ±6.64% ±8.64% buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='one_byte' -2.10 % ±5.60% ±7.45% ±9.70% buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='three_bytes' ** -7.48 % ±4.93% ±6.56% ±8.54% buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='two_bytes' 1.35 % ±5.68% ±7.55% ±9.84% buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='four_bytes' 0.62 % ±3.03% ±4.04% ±5.25% buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='one_byte' -0.62 % ±6.98% ±9.28% ±12.08% buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='three_bytes' 2.69 % ±3.22% ±4.29% ±5.58% buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='two_bytes' -1.67 % ±3.71% ±4.93% ±6.42% buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='four_bytes' -1.96 % ±5.86% ±7.80% ±10.15% buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='one_byte' -3.82 % ±5.47% ±7.29% ±9.51% buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='three_bytes' * 7.19 % ±5.95% ±7.91% ±10.30% buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='two_bytes' -2.75 % ±5.12% ±6.82% ±8.88% buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='four_bytes' 0.20 % ±0.45% ±0.60% ±0.78% buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='one_byte' -1.87 % ±3.41% ±4.53% ±5.90% buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='three_bytes' 0.07 % ±1.03% ±1.38% ±1.79% buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='two_bytes' -0.52 % ±1.06% ±1.41% ±1.84% buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='four_bytes' * -6.65 % ±5.36% ±7.13% ±9.29% buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='one_byte' -0.80 % ±5.44% ±7.23% ±9.42% buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='three_bytes' 1.69 % ±5.29% ±7.04% ±9.16% buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='two_bytes' -5.04 % ±5.74% ±7.63% ±9.94% buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='four_bytes' 0.45 % ±1.72% ±2.29% ±2.99% buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='one_byte' -0.14 % ±5.19% ±6.90% ±8.99% buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='three_bytes' 0.22 % ±2.17% ±2.89% ±3.76% buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='two_bytes' -1.43 % ±2.36% ±3.14% ±4.08% buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='four_bytes' -0.94 % ±4.90% ±6.52% ±8.48% buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='one_byte' -1.18 % ±5.77% ±7.67% ±9.99% buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='three_bytes' * 6.35 % ±5.43% ±7.23% ±9.42% buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='two_bytes' -3.87 % ±5.42% ±7.22% ±9.42% buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='four_bytes' -0.00 % ±0.06% ±0.07% ±0.10% buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='one_byte' -0.20 % ±0.58% ±0.77% ±1.00% buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='three_bytes' -0.05 % ±0.11% ±0.14% ±0.18% buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='two_bytes' 0.04 % ±0.11% ±0.14% ±0.19% buffers/buffer-compare-instance-method.js n=1000000 args=1 size=16 -2.09 % ±9.56% ±12.72% ±16.55% buffers/buffer-compare-instance-method.js n=1000000 args=1 size=16386 * 2.93 % ±2.81% ±3.75% ±4.90% buffers/buffer-compare-instance-method.js n=1000000 args=1 size=4096 3.38 % ±7.61% ±10.13% ±13.19% buffers/buffer-compare-instance-method.js n=1000000 args=1 size=512 * -12.01 % ±9.62% ±12.80% ±16.67% buffers/buffer-compare-instance-method.js n=1000000 args=2 size=16 1.50 % ±7.88% ±10.49% ±13.67% buffers/buffer-compare-instance-method.js n=1000000 args=2 size=16386 2.31 % ±2.67% ±3.55% ±4.62% buffers/buffer-compare-instance-method.js n=1000000 args=2 size=4096 * -6.47 % ±6.43% ±8.56% ±11.14% buffers/buffer-compare-instance-method.js n=1000000 args=2 size=512 9.74 % ±10.71% ±14.25% ±18.55% buffers/buffer-compare-instance-method.js n=1000000 args=5 size=16 2.73 % ±10.48% ±13.95% ±18.17% buffers/buffer-compare-instance-method.js n=1000000 args=5 size=16386 * 2.75 % ±2.10% ±2.79% ±3.63% buffers/buffer-compare-instance-method.js n=1000000 args=5 size=4096 2.58 % ±6.00% ±7.98% ±10.39% buffers/buffer-compare-instance-method.js n=1000000 args=5 size=512 -0.53 % ±8.88% ±11.82% ±15.38% buffers/buffer-compare-offset.js n=1000000 size=16 method='offset' 6.77 % ±10.51% ±13.98% ±18.20% buffers/buffer-compare-offset.js n=1000000 size=16 method='slice' 0.98 % ±4.27% ±5.68% ±7.40% buffers/buffer-compare-offset.js n=1000000 size=16386 method='offset' 1.28 % ±9.47% ±12.60% ±16.40% buffers/buffer-compare-offset.js n=1000000 size=16386 method='slice' 0.51 % ±3.64% ±4.84% ±6.30% buffers/buffer-compare-offset.js n=1000000 size=4096 method='offset' -4.31 % ±9.12% ±12.14% ±15.80% buffers/buffer-compare-offset.js n=1000000 size=4096 method='slice' -0.91 % ±3.26% ±4.33% ±5.64% buffers/buffer-compare-offset.js n=1000000 size=512 method='offset' -2.52 % ±9.88% ±13.15% ±17.12% buffers/buffer-compare-offset.js n=1000000 size=512 method='slice' 0.81 % ±3.75% ±5.00% ±6.50% buffers/buffer-compare.js n=1000000 size=16 4.40 % ±8.57% ±11.42% ±14.90% buffers/buffer-compare.js n=1000000 size=16386 * 3.28 % ±2.65% ±3.53% ±4.59% buffers/buffer-compare.js n=1000000 size=4096 -3.33 % ±8.51% ±11.32% ±14.73% buffers/buffer-compare.js n=1000000 size=512 -3.93 % ±10.07% ±13.40% ±17.45% buffers/buffer-concat-fill.js n=800000 extraSize=1 -1.83 % ±5.37% ±7.15% ±9.30% buffers/buffer-concat-fill.js n=800000 extraSize=1024 -0.60 % ±2.30% ±3.07% ±4.01% buffers/buffer-concat-fill.js n=800000 extraSize=256 -0.08 % ±3.58% ±4.76% ±6.21% buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=1 pieces=16 0.95 % ±3.86% ±5.14% ±6.69% buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=1 pieces=4 -0.94 % ±8.76% ±11.66% ±15.17% buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=16 pieces=16 0.52 % ±3.11% ±4.13% ±5.38% buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=16 pieces=4 -1.57 % ±7.98% ±10.63% ±13.84% buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=256 pieces=16 -0.17 % ±1.25% ±1.66% ±2.16% buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=256 pieces=4 1.53 % ±3.30% ±4.39% ±5.72% buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=1 pieces=16 2.03 % ±2.98% ±3.97% ±5.17% buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=1 pieces=4 -1.02 % ±8.85% ±11.77% ±15.33% buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=16 pieces=16 * 4.52 % ±3.85% ±5.12% ±6.66% buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=16 pieces=4 0.15 % ±7.87% ±10.47% ±13.63% buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=256 pieces=16 -0.95 % ±1.20% ±1.60% ±2.09% buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=256 pieces=4 -1.15 % ±3.11% ±4.14% ±5.39% buffers/buffer-copy.js n=6000000 partial='false' bytes=0 -1.95 % ±9.07% ±12.07% ±15.71% buffers/buffer-copy.js n=6000000 partial='true' bytes=128 0.53 % ±1.78% ±2.37% ±3.08% buffers/buffer-copy.js n=6000000 partial='true' bytes=32768 -1.62 % ±3.18% ±4.23% ±5.50% buffers/buffer-copy.js n=6000000 partial='true' bytes=8 0.05 % ±2.02% ±2.69% ±3.50% buffers/buffer-creation.js n=600000 len=10 type='fast-alloc-fill' -4.61 % ±9.74% ±12.97% ±16.88% buffers/buffer-creation.js n=600000 len=10 type='fast-alloc' -2.35 % ±6.29% ±8.37% ±10.92% buffers/buffer-creation.js n=600000 len=10 type='fast-allocUnsafe' 3.85 % ±6.95% ±9.25% ±12.04% buffers/buffer-creation.js n=600000 len=10 type='slow-allocUnsafe' 7.14 % ±10.02% ±13.34% ±17.36% buffers/buffer-creation.js n=600000 len=1024 type='fast-alloc-fill' -0.62 % ±1.41% ±1.88% ±2.45% buffers/buffer-creation.js n=600000 len=1024 type='fast-alloc' -1.10 % ±1.93% ±2.57% ±3.35% buffers/buffer-creation.js n=600000 len=1024 type='fast-allocUnsafe' 1.84 % ±5.43% ±7.23% ±9.41% buffers/buffer-creation.js n=600000 len=1024 type='slow-allocUnsafe' 1.35 % ±2.04% ±2.71% ±3.53% buffers/buffer-creation.js n=600000 len=4096 type='fast-alloc-fill' 0.04 % ±1.63% ±2.17% ±2.83% buffers/buffer-creation.js n=600000 len=4096 type='fast-alloc' 0.51 % ±1.36% ±1.80% ±2.35% buffers/buffer-creation.js n=600000 len=4096 type='fast-allocUnsafe' 0.33 % ±2.17% ±2.89% ±3.76% buffers/buffer-creation.js n=600000 len=4096 type='slow-allocUnsafe' 0.20 % ±1.60% ±2.13% ±2.77% buffers/buffer-creation.js n=600000 len=8192 type='fast-alloc-fill' -0.38 % ±1.77% ±2.36% ±3.07% buffers/buffer-creation.js n=600000 len=8192 type='fast-alloc' 0.74 % ±1.37% ±1.82% ±2.37% buffers/buffer-creation.js n=600000 len=8192 type='fast-allocUnsafe' * -1.47 % ±1.36% ±1.82% ±2.38% buffers/buffer-creation.js n=600000 len=8192 type='slow-allocUnsafe' 0.70 % ±1.85% ±2.46% ±3.20% buffers/buffer-equals.js n=1000000 difflen='false' size=0 *** 128.08 % ±13.06% ±17.43% ±22.77% buffers/buffer-equals.js n=1000000 difflen='false' size=16386 *** -9.56 % ±3.14% ±4.18% ±5.44% buffers/buffer-equals.js n=1000000 difflen='false' size=512 *** 39.88 % ±11.28% ±15.08% ±19.79% buffers/buffer-equals.js n=1000000 difflen='true' size=0 *** 72.04 % ±9.32% ±12.41% ±16.16% buffers/buffer-equals.js n=1000000 difflen='true' size=16386 *** 60.21 % ±12.47% ±16.61% ±21.66% buffers/buffer-equals.js n=1000000 difflen='true' size=512 *** 66.80 % ±9.09% ±12.09% ±15.74% buffers/buffer-fill.js n=20000 size=65536 type='fill("")' * -2.32 % ±2.14% ±2.85% ±3.72% buffers/buffer-fill.js n=20000 size=65536 type='fill("t", "utf8")' 1.43 % ±3.60% ±4.79% ±6.24% buffers/buffer-fill.js n=20000 size=65536 type='fill("t", 0, "utf8")' 0.12 % ±3.32% ±4.41% ±5.74% buffers/buffer-fill.js n=20000 size=65536 type='fill("t", 0)' 0.77 % ±3.57% ±4.74% ±6.18% buffers/buffer-fill.js n=20000 size=65536 type='fill("t")' -2.50 % ±3.82% ±5.08% ±6.63% buffers/buffer-fill.js n=20000 size=65536 type='fill("test")' -2.28 % ±5.47% ±7.28% ±9.50% buffers/buffer-fill.js n=20000 size=65536 type='fill(0)' 1.69 % ±1.82% ±2.43% ±3.16% buffers/buffer-fill.js n=20000 size=65536 type='fill(100)' -2.03 % ±3.97% ±5.32% ±7.00% buffers/buffer-fill.js n=20000 size=65536 type='fill(400)' 1.09 % ±4.85% ±6.46% ±8.43% buffers/buffer-fill.js n=20000 size=65536 type='fill(Buffer.alloc(1), 0)' -0.03 % ±4.10% ±5.45% ±7.10% buffers/buffer-fill.js n=20000 size=8192 type='fill("")' *** 11.83 % ±4.89% ±6.50% ±8.46% buffers/buffer-fill.js n=20000 size=8192 type='fill("t", "utf8")' 2.40 % ±4.64% ±6.17% ±8.03% buffers/buffer-fill.js n=20000 size=8192 type='fill("t", 0, "utf8")' ** 8.13 % ±5.01% ±6.69% ±8.76% buffers/buffer-fill.js n=20000 size=8192 type='fill("t", 0)' *** 11.58 % ±5.45% ±7.25% ±9.44% buffers/buffer-fill.js n=20000 size=8192 type='fill("t")' *** 10.82 % ±5.06% ±6.73% ±8.76% buffers/buffer-fill.js n=20000 size=8192 type='fill("test")' 3.84 % ±6.36% ±8.47% ±11.04% buffers/buffer-fill.js n=20000 size=8192 type='fill(0)' *** 23.21 % ±7.64% ±10.18% ±13.29% buffers/buffer-fill.js n=20000 size=8192 type='fill(100)' *** 14.54 % ±6.86% ±9.15% ±11.95% buffers/buffer-fill.js n=20000 size=8192 type='fill(400)' *** 19.85 % ±7.32% ±9.74% ±12.69% buffers/buffer-fill.js n=20000 size=8192 type='fill(Buffer.alloc(1), 0)' 3.14 % ±4.19% ±5.58% ±7.26% buffers/buffer-from.js n=800000 len=100 source='array' 0.24 % ±7.16% ±9.54% ±12.42% buffers/buffer-from.js n=800000 len=100 source='arraybuffer-middle' 2.53 % ±11.05% ±14.70% ±19.13% buffers/buffer-from.js n=800000 len=100 source='arraybuffer' -6.11 % ±9.11% ±12.13% ±15.80% buffers/buffer-from.js n=800000 len=100 source='buffer' -5.49 % ±8.40% ±11.18% ±14.55% buffers/buffer-from.js n=800000 len=100 source='object' -1.04 % ±9.86% ±13.12% ±17.07% buffers/buffer-from.js n=800000 len=100 source='string-base64' 2.38 % ±3.94% ±5.24% ±6.83% buffers/buffer-from.js n=800000 len=100 source='string-utf8' 0.46 % ±5.81% ±7.73% ±10.06% buffers/buffer-from.js n=800000 len=100 source='string' 2.26 % ±5.50% ±7.33% ±9.54% buffers/buffer-from.js n=800000 len=100 source='uint16array' 3.81 % ±7.14% ±9.51% ±12.37% buffers/buffer-from.js n=800000 len=100 source='uint8array' -1.99 % ±8.41% ±11.19% ±14.56% buffers/buffer-from.js n=800000 len=2048 source='array' * 1.49 % ±1.25% ±1.67% ±2.18% buffers/buffer-from.js n=800000 len=2048 source='arraybuffer-middle' -7.81 % ±9.98% ±13.29% ±17.30% buffers/buffer-from.js n=800000 len=2048 source='arraybuffer' -8.89 % ±10.24% ±13.62% ±17.73% buffers/buffer-from.js n=800000 len=2048 source='buffer' 0.90 % ±1.69% ±2.26% ±2.94% buffers/buffer-from.js n=800000 len=2048 source='object' -1.47 % ±10.25% ±13.64% ±17.75% buffers/buffer-from.js n=800000 len=2048 source='string-base64' 0.82 % ±1.52% ±2.03% ±2.65% buffers/buffer-from.js n=800000 len=2048 source='string-utf8' 0.41 % ±1.76% ±2.35% ±3.05% buffers/buffer-from.js n=800000 len=2048 source='string' -0.52 % ±1.54% ±2.06% ±2.68% buffers/buffer-from.js n=800000 len=2048 source='uint16array' -0.17 % ±2.53% ±3.37% ±4.38% buffers/buffer-from.js n=800000 len=2048 source='uint8array' 0.93 % ±2.12% ±2.82% ±3.68% buffers/buffer-hex-decode.js n=1000000 len=1024 0.19 % ±0.64% ±0.85% ±1.11% buffers/buffer-hex-decode.js n=1000000 len=64 2.28 % ±3.85% ±5.12% ±6.67% buffers/buffer-hex-encode.js n=1000000 len=1024 -0.60 % ±1.57% ±2.09% ±2.73% buffers/buffer-hex-encode.js n=1000000 len=64 0.96 % ±5.38% ±7.16% ±9.32% buffers/buffer-indexof-number.js n=1000000 value=64 -6.43 % ±7.77% ±10.38% ±13.58% buffers/buffer-indexof.js n=50000 type='buffer' encoding='undefined' search='--l' -3.92 % ±5.14% ±6.85% ±8.91% buffers/buffer-indexof.js n=50000 type='buffer' encoding='undefined' search='@' -0.24 % ±5.29% ±7.04% ±9.17% buffers/buffer-indexof.js n=50000 type='buffer' encoding='undefined' search='</i> to the Caterpillar' -0.20 % ±1.28% ±1.71% ±2.22% buffers/buffer-indexof.js n=50000 type='buffer' encoding='undefined' search='aaaaaaaaaaaaaaaaa' -0.30 % ±1.73% ±2.31% ±3.00% buffers/buffer-indexof.js n=50000 type='buffer' encoding='undefined' search='Alice' 1.66 % ±7.47% ±9.94% ±12.94% buffers/buffer-indexof.js n=50000 type='buffer' encoding='undefined' search='found it very' 0.45 % ±0.72% ±0.96% ±1.25% buffers/buffer-indexof.js n=50000 type='buffer' encoding='undefined' search='Gryphon' -4.42 % ±9.68% ±12.88% ±16.76% buffers/buffer-indexof.js n=50000 type='buffer' encoding='undefined' search='neighbouring pool' -0.18 % ±0.92% ±1.23% ±1.60% buffers/buffer-indexof.js n=50000 type='buffer' encoding='undefined' search='Ou est ma chatte?' -0.39 % ±2.40% ±3.19% 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args='offset' encoding='latin1' -6.65 % ±6.87% ±9.15% ±11.91% buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='utf16le' 3.79 % ±6.24% ±8.30% ±10.80% buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='utf8' 2.24 % ±4.00% ±5.33% ±6.94% buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='' 2.53 % ±4.39% ±5.84% ±7.60% buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='ascii' -5.97 % ±6.59% ±8.77% ±11.42% buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='hex' * 1.50 % ±1.40% ±1.87% ±2.43% buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='latin1' * -6.02 % ±5.36% ±7.13% ±9.28% buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='utf16le' 0.80 % ±5.30% ±7.05% ±9.18% buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='utf8' 1.70 % ±2.66% ±3.55% ±4.63% buffers/buffer-write.js n=1000000 type='BigInt64BE' buffer='fast' 3.28 % ±8.07% ±10.74% ±13.99% buffers/buffer-write.js n=1000000 type='BigInt64LE' buffer='fast' -2.96 % ±7.04% ±9.37% ±12.20% buffers/buffer-write.js n=1000000 type='BigUInt64BE' buffer='fast' -0.58 % ±5.55% ±7.40% ±9.64% buffers/buffer-write.js n=1000000 type='BigUInt64LE' buffer='fast' -0.37 % ±5.11% ±6.80% ±8.86% buffers/buffer-write.js n=1000000 type='DoubleBE' buffer='fast' 4.18 % ±6.78% ±9.04% ±11.81% buffers/buffer-write.js n=1000000 type='DoubleLE' buffer='fast' -5.04 % ±7.62% ±10.15% ±13.21% buffers/buffer-write.js n=1000000 type='FloatBE' buffer='fast' 2.64 % ±7.63% ±10.16% ±13.23% buffers/buffer-write.js n=1000000 type='FloatLE' buffer='fast' -3.47 % ±8.13% ±10.82% ±14.08% buffers/buffer-write.js n=1000000 type='Int16BE' buffer='fast' 3.74 % ±8.60% ±11.45% ±14.90% buffers/buffer-write.js n=1000000 type='Int16LE' buffer='fast' -0.60 % ±7.93% ±10.56% ±13.74% buffers/buffer-write.js n=1000000 type='Int32BE' buffer='fast' 5.00 % ±8.41% ±11.19% ±14.56% buffers/buffer-write.js n=1000000 type='Int32LE' buffer='fast' -4.70 % ±7.65% ±10.18% ±13.25% buffers/buffer-write.js n=1000000 type='Int8' buffer='fast' -0.20 % ±9.59% ±12.76% ±16.61% buffers/buffer-write.js n=1000000 type='IntBE' buffer='fast' 9.04 % ±15.33% ±20.41% ±26.59% buffers/buffer-write.js n=1000000 type='IntLE' buffer='fast' -8.14 % ±10.82% ±14.41% ±18.78% buffers/buffer-write.js n=1000000 type='UInt16BE' buffer='fast' 0.20 % ±8.80% ±11.71% ±15.24% buffers/buffer-write.js n=1000000 type='UInt16LE' buffer='fast' * -8.94 % ±7.96% ±10.59% ±13.78% buffers/buffer-write.js n=1000000 type='UInt32BE' buffer='fast' -1.89 % ±7.77% ±10.34% ±13.46% buffers/buffer-write.js n=1000000 type='UInt32LE' buffer='fast' -5.75 % ±8.03% ±10.69% ±13.91% buffers/buffer-write.js n=1000000 type='UInt8' buffer='fast' * -8.90 % ±8.01% ±10.65% ±13.87% buffers/buffer-write.js n=1000000 type='UIntBE' buffer='fast' 4.93 % ±8.55% ±11.38% ±14.82% buffers/buffer-write.js n=1000000 type='UIntLE' buffer='fast' 5.94 % ±9.16% ±12.18% ±15.85% buffers/buffer-zero.js type='buffer' n=1000000 -1.04 % ±3.46% ±4.64% ±6.11% buffers/buffer-zero.js type='string' n=1000000 1.64 % ±4.26% ±5.73% ±7.60% buffers/dataview-set.js n=1000000 type='Float32BE' 1.52 % ±2.96% ±3.96% ±5.21% buffers/dataview-set.js n=1000000 type='Float32LE' -0.08 % ±0.64% ±0.85% ±1.11% buffers/dataview-set.js n=1000000 type='Float64BE' 0.21 % ±0.90% ±1.21% ±1.59% buffers/dataview-set.js n=1000000 type='Float64LE' 0.73 % ±1.17% ±1.57% ±2.08% buffers/dataview-set.js n=1000000 type='Int16BE' 0.18 % ±1.17% ±1.55% ±2.03% buffers/dataview-set.js n=1000000 type='Int16LE' 2.71 % ±4.03% ±5.41% ±7.15% buffers/dataview-set.js n=1000000 type='Int32BE' 2.20 % ±2.71% ±3.63% ±4.79% buffers/dataview-set.js n=1000000 type='Int32LE' 0.49 % ±1.28% ±1.71% ±2.23% buffers/dataview-set.js n=1000000 type='Int8' 0.82 % ±1.29% ±1.72% ±2.24% buffers/dataview-set.js n=1000000 type='Uint16BE' -0.03 % ±1.09% ±1.45% ±1.89% buffers/dataview-set.js n=1000000 type='Uint16LE' -0.23 % ±1.31% ±1.75% ±2.27% buffers/dataview-set.js n=1000000 type='Uint32BE' -0.97 % ±3.14% ±4.23% ±5.61% buffers/dataview-set.js n=1000000 type='Uint32LE' -0.41 % ±0.65% ±0.87% ±1.13% buffers/dataview-set.js n=1000000 type='Uint8' 0.34 % ±1.10% ±1.46% ±1.91% Be aware that when doing many comparisons the risk of a false-positive result increases. In this case, there are 388 comparisons, you can thus expect the following amount of false-positive results: 19.40 false positives, when considering a 5% risk acceptance (*, **, ***), 3.88 false positives, when considering a 1% risk acceptance (**, ***), 0.39 false positives, when considering a 0.1% risk acceptance (***) 

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CI: https://ci.nodejs.org/job/node-test-pull-request/55509/

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CI: https://ci.nodejs.org/job/node-test-pull-request/55528/

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CI: https://ci.nodejs.org/job/node-test-pull-request/55530/

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Landed in 89c66ae