POC non-blocking read-write map. The tradeoff exposed here is 2x the memory usage due to swapping between two maps.
Inspired by: https://www.youtube.com/watch?v=s19G6n0UjsM
The first initial version of "just getting it to work". Can't beat sync.Map and write performance is slow.
Run benchmark with
$ docker run --rm --mount type=bind,source="$(pwd)",target=/evmap -w /evmap golang:alpine go test -count=1 -v -run=. -bench=. ./...
Passes the race detector when run as go test -race -count=1 -v -run=. -bench=. ./... albeit slowly.
=== RUN TestMap
--- PASS: TestMap (0.00s)
goos: linux
goarch: amd64
pkg: github.com/mgnsk/evmap
BenchmarkEvMapReadSync
BenchmarkEvMapReadSync/read
BenchmarkEvMapReadSync/read/single_writer_single_reader
BenchmarkEvMapReadSync/read/single_writer_single_reader-4 8752372 127 ns/op 0 B/op 0 allocs/op
BenchmarkEvMapReadSync/read/multi_writer_single_reader
BenchmarkEvMapReadSync/read/multi_writer_single_reader-4 5005664 202 ns/op 0 B/op 0 allocs/op
BenchmarkEvMapReadSync/read/single_writer_multi_reader
BenchmarkEvMapReadSync/read/single_writer_multi_reader-4 21856057 46.2 ns/op 0 B/op 0 allocs/op
BenchmarkEvMapReadSync/read/multi_writer_multi_reader
BenchmarkEvMapReadSync/read/multi_writer_multi_reader-4 12506944 113 ns/op 0 B/op 0 allocs/op
BenchmarkEvMapRead100Millisecond
BenchmarkEvMapRead100Millisecond/read
BenchmarkEvMapRead100Millisecond/read/single_writer_single_reader
BenchmarkEvMapRead100Millisecond/read/single_writer_single_reader-4 13871166 104 ns/op 0 B/op 0 allocs/op
BenchmarkEvMapRead100Millisecond/read/multi_writer_single_reader
BenchmarkEvMapRead100Millisecond/read/multi_writer_single_reader-4 6026190 185 ns/op 0 B/op 0 allocs/op
BenchmarkEvMapRead100Millisecond/read/single_writer_multi_reader
BenchmarkEvMapRead100Millisecond/read/single_writer_multi_reader-4 23838170 46.9 ns/op 0 B/op 0 allocs/op
BenchmarkEvMapRead100Millisecond/read/multi_writer_multi_reader
BenchmarkEvMapRead100Millisecond/read/multi_writer_multi_reader-4 18426666 110 ns/op 0 B/op 0 allocs/op
BenchmarkMutexMapRead
BenchmarkMutexMapRead/read
BenchmarkMutexMapRead/read/single_writer_single_reader
BenchmarkMutexMapRead/read/single_writer_single_reader-4 1000000 2403 ns/op 0 B/op 0 allocs/op
BenchmarkMutexMapRead/read/multi_writer_single_reader
BenchmarkMutexMapRead/read/multi_writer_single_reader-4 636568 4955 ns/op 0 B/op 0 allocs/op
BenchmarkMutexMapRead/read/single_writer_multi_reader
BenchmarkMutexMapRead/read/single_writer_multi_reader-4 1388348 1140 ns/op 0 B/op 0 allocs/op
BenchmarkMutexMapRead/read/multi_writer_multi_reader
BenchmarkMutexMapRead/read/multi_writer_multi_reader-4 1360434 999 ns/op 0 B/op 0 allocs/op
BenchmarkSyncMapRead
BenchmarkSyncMapRead/read
BenchmarkSyncMapRead/read/single_writer_single_reader
BenchmarkSyncMapRead/read/single_writer_single_reader-4 14548926 83.0 ns/op 5 B/op 0 allocs/op
BenchmarkSyncMapRead/read/multi_writer_single_reader
BenchmarkSyncMapRead/read/multi_writer_single_reader-4 10583112 113 ns/op 14 B/op 0 allocs/op
BenchmarkSyncMapRead/read/single_writer_multi_reader
BenchmarkSyncMapRead/read/single_writer_multi_reader-4 30319982 38.1 ns/op 1 B/op 0 allocs/op
BenchmarkSyncMapRead/read/multi_writer_multi_reader
BenchmarkSyncMapRead/read/multi_writer_multi_reader-4 27150357 56.0 ns/op 5 B/op 0 allocs/op
BenchmarkEvMapWriteSync
BenchmarkEvMapWriteSync/write
BenchmarkEvMapWriteSync/write/single_writer_single_reader
BenchmarkEvMapWriteSync/write/single_writer_single_reader-4 1824427 649 ns/op 0 B/op 0 allocs/op
BenchmarkEvMapWriteSync/write/multi_writer_single_reader
BenchmarkEvMapWriteSync/write/multi_writer_single_reader-4 763472 1620 ns/op 0 B/op 0 allocs/op
BenchmarkEvMapWriteSync/write/single_writer_multi_reader
BenchmarkEvMapWriteSync/write/single_writer_multi_reader-4 3822 1930265 ns/op 0 B/op 0 allocs/op
BenchmarkEvMapWriteSync/write/multi_writer_multi_reader
BenchmarkEvMapWriteSync/write/multi_writer_multi_reader-4 100 23744591 ns/op 196 B/op 0 allocs/op
BenchmarkEvMapWrite100Millisecond
BenchmarkEvMapWrite100Millisecond/write
BenchmarkEvMapWrite100Millisecond/write/single_writer_single_reader
BenchmarkEvMapWrite100Millisecond/write/single_writer_single_reader-4 4166439 262 ns/op 0 B/op 0 allocs/op
BenchmarkEvMapWrite100Millisecond/write/multi_writer_single_reader
BenchmarkEvMapWrite100Millisecond/write/multi_writer_single_reader-4 1546425 836 ns/op 0 B/op 0 allocs/op
BenchmarkEvMapWrite100Millisecond/write/single_writer_multi_reader
BenchmarkEvMapWrite100Millisecond/write/single_writer_multi_reader-4 2876132 417 ns/op 0 B/op 0 allocs/op
BenchmarkEvMapWrite100Millisecond/write/multi_writer_multi_reader
BenchmarkEvMapWrite100Millisecond/write/multi_writer_multi_reader-4 1238622 1054 ns/op 0 B/op 0 allocs/op
BenchmarkMutexMapWrite
BenchmarkMutexMapWrite/write
BenchmarkMutexMapWrite/write/single_writer_single_reader
BenchmarkMutexMapWrite/write/single_writer_single_reader-4 1387116 3001 ns/op 0 B/op 0 allocs/op
BenchmarkMutexMapWrite/write/multi_writer_single_reader
BenchmarkMutexMapWrite/write/multi_writer_single_reader-4 877587 5249 ns/op 0 B/op 0 allocs/op
BenchmarkMutexMapWrite/write/single_writer_multi_reader
BenchmarkMutexMapWrite/write/single_writer_multi_reader-4 466520 4555 ns/op 0 B/op 0 allocs/op
BenchmarkMutexMapWrite/write/multi_writer_multi_reader
BenchmarkMutexMapWrite/write/multi_writer_multi_reader-4 275862 6844 ns/op 0 B/op 0 allocs/op
BenchmarkSyncMapWrite
BenchmarkSyncMapWrite/write
BenchmarkSyncMapWrite/write/single_writer_single_reader
BenchmarkSyncMapWrite/write/single_writer_single_reader-4 6667801 181 ns/op 16 B/op 1 allocs/op
BenchmarkSyncMapWrite/write/multi_writer_single_reader
BenchmarkSyncMapWrite/write/multi_writer_single_reader-4 12297567 82.8 ns/op 16 B/op 1 allocs/op
BenchmarkSyncMapWrite/write/single_writer_multi_reader
BenchmarkSyncMapWrite/write/single_writer_multi_reader-4 4971781 230 ns/op 16 B/op 1 allocs/op
BenchmarkSyncMapWrite/write/multi_writer_multi_reader
BenchmarkSyncMapWrite/write/multi_writer_multi_reader-4 10579861 109 ns/op 16 B/op 1 allocs/op
PASS
ok github.com/mgnsk/evmap 67.431s