Stop Letting io.Copy Steal Your Throughput — The Zero-Copy Fix

[Cheikh Seck]

Hi all,

I wrote up something on a performance footgun most of us walk right past. io.Copy looks innocent, but it is doing a lot more copying than you would think.

https://medium.com/dev-genius/zero-copy-go-why-io-copy-is-lying-to-you-sendfile-splice-11748e293462


In it I cover:

- Why io.Copy does extra kernel to user to kernel round-trips
- How sendfile and splice actually move bytes without touching user space
- Benchmarks showing the real-world gap on large transfers
- Where zero-copy helps and where it does not

Curious what patterns you all reach for when squeezing throughput out of network and file I/O.

[Duncan Harris]

Posting pay to view article links seems to me to be not appropriate for this group.

I don't know if you intended this or not, but posting it as free to read URL would be better.

Duncan

[Cheikh Seck]

Sorry about that Duncan I'll post the free link moving forward:

https://blog.devgenius.io/zero-copy-go-why-io-copy-is-lying-to-you-sendfile-splice-11748e293462?sk=fae4701df623c1993462e1bfdc3ff794

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