perf: improve packets.ReadPacket performance#322
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Replace a couple instances of io.CopyN with io.ReadFull to avoid the
former's extra buffer allocations. This gives a surprisingly large
performance boost.
goos: linux
goarch: amd64
pkg: github.com/eclipse/paho.golang/packets
cpu: Intel(R) Core(TM) Ultra 7 165H
│ before.txt │ after.txt │
│ sec/op │ sec/op vs base │
ReadPacket/small-22 1109.0n ± 2% 575.8n ± 1% -48.08% (p=0.000 n=8)
ReadPacket/large-22 3.395µ ± 1% 1.405µ ± 2% -58.62% (p=0.000 n=8)
geomean 1.940µ 899.3n -53.65%
│ before.txt │ after.txt │
│ B/op │ B/op vs base │
ReadPacket/small-22 2315.0 ± 0% 696.0 ± 0% -69.94% (p=0.000 n=8)
ReadPacket/large-22 8.826Ki ± 0% 2.853Ki ± 0% -67.68% (p=0.000 n=8)
geomean 4.467Ki 1.392Ki -68.83%
│ before.txt │ after.txt │
│ allocs/op │ allocs/op vs base │
ReadPacket/small-22 16.00 ± 0% 13.00 ± 0% -18.75% (p=0.000 n=8)
ReadPacket/large-22 26.00 ± 0% 17.00 ± 0% -34.62% (p=0.000 n=8)
geomean 20.40 14.87 -27.11%
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Replace a couple instances of io.CopyN with io.ReadFull to avoid the former's extra buffer allocations. This gives a surprisingly large performance boost.
Testing
Existing tests pass.
Closing issues
closes #320