Fast File IO with .NET 6
summary
.NET 6 rewrites file I/O and shows concrete wins: benchmarks (BenchmarkDotNet + profilers) report reduced syscalls, much lower allocations and large latency drops — seeking forward and async reads/writes measure up to 50x faster in microbenchmarks, async writes up to ~5x faster and reads ~2x faster, with allocation-free steady-state after the first call. New APIs include File.OpenHandle and RandomAccess plus scatter/gather writes; disabling buffering and using 64 KB buffers or the scatter API cuts syscall overhead.
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chapters (11)
- 0:00Introduction
- 2:33File stream basics
- 11:57Buffering and performance tips
- 18:03Async file IO necessity
- 26:08Position tracking improvements
- 33:44Async write optimizations
- 41:40Read async optimizations
- 46:51Performance gains summary
- 47:13New APIs in .NET 6
- 58:21Performance recap and tips
- 1:02:38Q&A and closing
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