dd: fix precision for display of total time spent #4498
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Improve the display of the total time spent transferring bytes so that
the number of seconds is displayed using the `%g` format specifier as
in `printf`. This matches the behavior of GNU `dd`.
Before this commit, the precision was always set to one digit after
the decimal point. For example,
$ dd count=100000 if=/dev/zero of=/dev/null
100000+0 records in
100000+0 records out
51200000 bytes (51 MB, 49 MiB) copied, 0.2 s, 268.1 MB/s
After this commit, the precision increases dynamically as the duration
decreases. For example,
$ dd count=100000 if=/dev/zero of=/dev/null
100000+0 records in
100000+0 records out
51200000 bytes (51 MB, 49 MiB) copied, 0.1019 s, 507 MB/s
$ dd count=1000 if=/dev/zero of=/dev/null
1000+0 records in
1000+0 records out
512000 bytes (512 kB, 500 KiB) copied, 0.002663 s, 256 MB/s
$ dd count=10 if=/dev/zero of=/dev/null
10+0 records in
10+0 records out
5120 bytes (5.1 kB, 5.0 KiB) copied, 0.000182 s, 5.1 MB/s
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GNU testsuite comparison: |
tertsdiepraam
approved these changes
Mar 12, 2023
| @@ -692,6 +692,16 @@ impl CmdResult { | |||
| self | |||
| } | |||
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| #[track_caller] | |||
| pub fn stderr_matches(&self, regex: ®ex::Regex) -> &Self { | |||
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Nice, I thought we had this already :)
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Improve the display of the total time spent transferring bytes so that the number of seconds is displayed using the
%gformat specifier as inprintf. This matches the behavior of GNUdd.Before this commit, the precision was always set to one digit after the decimal point. For example,
After this commit, the precision increases dynamically as the duration decreases. For example,
(Second attempt after #4169.)