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Life & fun · March 7, 2021

WA

wcp – a reimplementation of cp using io_uring. With a nice progress bar

wcp – a reimplementation of cp using io_uring. With a nice progress bar launched on March 7, 2021 with 32 votes, #1,338 of 3,696 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 5 years on.

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In plain words

wcp is a command-line file copying tool that reimplements the standard cp command using io_uring, a Linux kernel interface for efficient input-output operations. It copies files and directories while displaying a progress bar to show transfer status. The tool is designed for users who work frequently with file operations on Linux systems and want faster performance with visual feedback during copying tasks.

written from the facts on this page · September 2026

From the sources

TLDR: I made a super fast (much faster than cp) command line copy program, with a nice progress bar. The implementation dives into some interesting bits of low level async I/O on linux. wcp is a file copying experiment I've been working on for the past while. Really, it's an excuse to try out io_uring , a relatively new asynchronous I/O system on linux. If you're unfamiliar with async I/O, it allows you to queue up reads and writes to run in the background, and check back later to see if they're done, without having to wait before you start doing other things (like submitting even more requests). This ain't no fancy pantsy high-level javascript event loopy memory safey framework though.…from wheybags.com

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