* Make WAL replay benchmark more representative
Signed-off-by: Chris Marchbanks <csmarchbanks@gmail.com>
* Move decoding records from the WAL into goroutine
Decoding the WAL records accounts for a significant amount of time on
startup, and can be done in parallel with creating series/samples to
speed up startup. However, records still must be handled in order, so
only a single goroutine can do the decoding.
benchmark
old ns/op new ns/op delta
BenchmarkLoadWAL/batches=10,seriesPerBatch=100,samplesPerSeries=7200-8
481607033 391971490 -18.61%
BenchmarkLoadWAL/batches=10,seriesPerBatch=10000,samplesPerSeries=50-8
836394378 629067006 -24.79%
BenchmarkLoadWAL/batches=10,seriesPerBatch=1000,samplesPerSeries=480-8
348238658 234218667 -32.74%
Signed-off-by: Chris Marchbanks <csmarchbanks@gmail.com>
