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[PERF] Chunk encoding: combine timestamp writes

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Instead of a 2-bit write followed by a 14-bit write, do two 8-bit
writes, which goes much faster since it avoids looping.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
This commit is contained in:
Bryan Boreham 2024-09-18 10:33:44 +01:00
parent b9a9689aae
commit 648a668835
1 changed files with 2 additions and 2 deletions
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4
tsdb/chunkenc/xor.go
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@ -191,8 +191,8 @@ func (a *xorAppender) Append(t int64, v float64) {
case dod == 0: case dod == 0:
a.b.writeBit(zero) a.b.writeBit(zero)
case bitRange(dod, 14): case bitRange(dod, 14):
a.b.writeBits(0b10, 2) a.b.writeByte(0b10<<6 | (uint8(dod>>8) & (1<<6 - 1))) // 0b10 size code combined with 6 bits of dod.
a.b.writeBits(uint64(dod), 14) a.b.writeByte(uint8(dod)) // Bottom 8 bits of dod.
case bitRange(dod, 17): case bitRange(dod, 17):
a.b.writeBits(0b110, 3) a.b.writeBits(0b110, 3)
a.b.writeBits(uint64(dod), 17) a.b.writeBits(uint64(dod), 17)