directio

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When my go code is running with this `O_DIRECT` flag, I run the command `free -h`, I can still see hundreds of megabytes buffer are used

soulmachine

Direct IO is best used with large buffer size, so it's probably more common to see async calls to DirectIO streams.

dukelion

Would be handy to have a method that opens a file and returns Direct IO Writer/Reader object for it. I'm thinking same signature as https://golang.org/src/os/file.go?h=OpenFile#L282

dukelion

Drives may have different block size, consider using ioctl with BLKSSZGET for alignment block size.

dukelion