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

Re:Show HN: wcp – a reimplementation of cp using io_uring. W... by wheybags on Sunday March 07, 2021 @09:08AM (#26375933)

The chart is showing data from an NFS copy, but the listed speeds in the blog and on github[1] are from a copy on a local SSD. That is a bit confusing though, maybe I should make it more clear. I used the network copy for ETA calculation because it was an easy way to make the transfer take longer - if the whole copy is only a few seconds long it's difficult to meaningfully compare ETA estimation accuracy between two approaches. I would like to have more performance data though.

1: https://github.com/wheybags/wcp/#how-fast

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Re:Show HN: wcp – a reimplementation of cp using io_uring. W... by abvr on Monday March 08, 2021 @04:07AM (#26383611)

I would love to see a comparison between scp and wcp over NFS, more specifically large single file sizes, if folks are looking to discern more performance parameters.

wcp is good stuff!

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Re:Show HN: wcp – a reimplementation of cp using io_uring. W... by wheybags on Monday March 08, 2021 @07:00AM (#26384783)

I would expect pretty much any plain copying program over NFS to beat scp, since scp has the overhead of encryption. On a slow disk with a fast CPU it might roughly match though.

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