8000 dd: status=progress should rewrite output once per second but rate is much faster · Issue #3073 · uutils/coreutils · GitHub
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dd: status=progress should rewrite output once per second but rate is much faster #3073

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jfinkels opened this issue Feb 5, 2022 · 1 comment
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dd: status=progress should rewrite output once per second but rate is much faster #3073

jfinkels opened this issue Feb 5, 2022 · 1 comment
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@jfinkels
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jfinkels commented Feb 5, 2022

This is hard to describe, so I encourage you to try running this command on your own:

GNU dd

$ timeout 5 dd status=progress < /dev/zero > /dev/null
5767469056 bytes (5.8 GB, 5.4 GiB) copied, 4 s, 1.4 GB/s

uutils dd:

$ timeout 5 ./target/debug/dd status=progress < /dev/zero > /dev/null
403468800 bytes (403 MB, 385 MiB) copied, 1.0 s, 396.7 MB/s

The status=progress causes the progress line to update repeatedly. GNU dd updates about once per second. uutils dd seems to update when each block is written. That makes the text change way too fast. Furthermore, you can see here that after five seconds, uutils dd reports that it has been running for 1.0 seconds, which is not correct.
@ndd7xv ndd7xv mentioned this issue Feb 6, 2022
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@jfinkels
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Fixed by #3078.

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