An ultimately minimal persistent key-value store + LRU cache
kv:
BenchmarkStoreGet-2 20000 59301 ns/op 84.32 MB/s
BenchmarkStoreSet-2 20000 68880 ns/op 72.59 MB/s
BenchmarkStoreCacheGet-2 3000000 404 ns/op 12347.96 MB/s
BenchmarkStoreCacheSet-2 2000000 715 ns/op 6983.40 MB/s
// Benchmarks below are copied from diskv tests
BenchmarkWrite__32B-2 50000 30470 ns/op 1.05 MB/s
BenchmarkWrite__1KB-2 50000 53329 ns/op 19.20 MB/s
BenchmarkWrite__4KB-2 30000 66490 ns/op 61.60 MB/s
BenchmarkWrite_10KB-2 20000 119928 ns/op 85.38 MB/s
BenchmarkRead__32B_NoCache-2 2000 523594 ns/op 0.06 MB/s
BenchmarkRead__1KB_NoCache-2 3000 641618 ns/op 1.60 MB/s
BenchmarkRead__4KB_NoCache-2 2000 733945 ns/op 5.58 MB/s
BenchmarkRead_10KB_NoCache-2 2000 803028 ns/op 12.75 MB/s
BenchmarkRead__32B_WithCache-2 1000000 1509 ns/op 21.20 MB/s
BenchmarkRead__1KB_WithCache-2 1000000 1221 ns/op 838.37 MB/s
BenchmarkRead__4KB_WithCache-2 1000000 1061 ns/op 3859.21 MB/s
BenchmarkRead_10KB_WithCache-2 1000000 1059 ns/op 9668.19 MB/s
Comparing to Diskv tested on the same machine:
BenchmarkWrite__32B_NoIndex-2 10000 113520 ns/op 0.28 MB/s
BenchmarkWrite__1KB_NoIndex-2 10000 111664 ns/op 9.17 MB/s
BenchmarkWrite__4KB_NoIndex-2 10000 118777 ns/op 34.48 MB/s
BenchmarkWrite_10KB_NoIndex-2 10000 136848 ns/op 74.83 MB/s
BenchmarkRead__32B_NoCache-2 50000 31648 ns/op 1.01 MB/s
BenchmarkRead__1KB_NoCache-2 50000 34720 ns/op 29.49 MB/s
BenchmarkRead__4KB_NoCache-2 20000 70228 ns/op 58.32 MB/s
BenchmarkRead_10KB_NoCache-2 10000 103389 ns/op 99.04 MB/s
BenchmarkRead__32B_WithCache-2 200000 7671 ns/op 4.17 MB/s
BenchmarkRead__1KB_WithCache-2 200000 9299 ns/op 110.11 MB/s
BenchmarkRead__4KB_WithCache-2 30000 33615 ns/op 121.85 MB/s
BenchmarkRead_10KB_WithCache-2 20000 93018 ns/op 110.09 MB/s
I don't say that kv is faster or better, but it's fast enough for a simple
key-value file-based storage.