@maypok86 It seems to have triggered a bug in the otter, and it's slowing it down terribly.

go test -benchmem -run=^$ -bench . github.com/lxzan/memorycache/benchmark
goos: linux
goarch: amd64
pkg: github.com/lxzan/memorycache/benchmark
cpu: AMD Ryzen 5 PRO 4650G with Radeon Graphics
BenchmarkMemoryCache_Set-12 21004170 72.60 ns/op 9 B/op 0 allocs/op
BenchmarkMemoryCache_Get-12 43787251 40.11 ns/op 0 B/op 0 allocs/op
BenchmarkMemoryCache_SetAndGet-12 45939994 45.35 ns/op 0 B/op 0 allocs/op
BenchmarkRistretto_Set-12 12190314 122.2 ns/op 112 B/op 2 allocs/op
BenchmarkRistretto_Get-12 25565082 44.60 ns/op 16 B/op 1 allocs/op
BenchmarkRistretto_SetAndGet-12 11713868 97.06 ns/op 27 B/op 1 allocs/op
BenchmarkOtter_SetAndGet-12 13760 89816 ns/op 13887 B/op 0 allocs/op
PASS
ok github.com/lxzan/memorycache/benchmark 44.081s


func BenchmarkOtter_SetAndGet(b *testing.B) {
var builder, _ = otter.NewBuilder[string, int](1000)
builder.ShardCount(128)
mc, _ := builder.Build()
for i := 0; i < benchcount; i++ {
mc.SetWithTTL(benchkeys[i%benchcount], 1, time.Hour)
}

b.ResetTimer()
b.RunParallel(func(pb *testing.PB) {
var i = atomic.Int64{}
for pb.Next() {
index := i.Add(1) % benchcount
if index&7 == 0 {
mc.SetWithTTL(benchkeys[index], 1, time.Hour)
} else {
mc.Get(benchkeys[index])
}
}
})
}