On Mon 02 Aug 2021 at 15:09:38 (-0400), Stefan Monnier wrote: > >> If it weren't for the first sometimes changing to > >> 44.xKiB/s it'd be hard to know which is which (IIUC the average is > >> higher because occasionally the drive gives a more reasonable transfer > >> rate than that measly 45kB/s). > > > > So now we're left wondering how you came by this situation. Perhaps > > you slumped onto the Return key, then woke up after a few minutes, > > having missed the initial burst that gave rise to the average being > > more than 50% faster than the current rate. > > I don't know either. Reading the whole drive would take a few years, so > I'm only fetching the few parts which have changed since the last > backup, and when I look the rate seems to be always ~45kB/s, but > obviously there have to be bursts at higher speeds (presumably because > the drive's defect doesn't affect every cylinder in the same way or > something like that. E.g. the average has moved up to ~80kB/s since my > last message).
Yes, perhaps because the drive is broken, there was no initial burst (which usually makes it obvious). 45kB/s is so slow that any normal-speed bursts might be too short to notice unless you're watching like a hawk. Most transfers are more likely to look something like below (narrowed). Nice command though (I too had never noticed it), especially the wall time, though I would say that having both I&e is less sensible than a&r when using the command for real. Perhaps I should have used -i myself … Cheers, David. $ pv -parIe <2021-01-20-inauguration-biden-harris-C-qYgs_yOXA.webm >/tmp/copy [86.8MiB/s] [86.8MiB/s] [> ] 1% ETA 0:01:25 ETA 18:51:46 [93.2MiB/s] [89.9MiB/s] [> ] 2% ETA 0:01:22 ETA 18:51:44 [91.9MiB/s] [90.6MiB/s] [> ] 3% ETA 0:01:20 ETA 18:51:43 [93.1MiB/s] [91.2MiB/s] [=> ] 4% ETA 0:01:18 ETA 18:51:42 [92.1MiB/s] [91.4MiB/s] [==> ] 6% ETA 0:01:17 ETA 18:51:42 [85.2MiB/s] [90.4MiB/s] [==> ] 7% ETA 0:01:17 ETA 18:51:43 [41.6MiB/s] [82.5MiB/s] [==> ] 7% ETA 0:01:22 ETA 18:51:49 [51.6MiB/s] [79.2MiB/s] [===> ] 8% ETA 0:01:27 ETA 18:51:55 [3.90MiB/s] [66.4MiB/s] [===> ] 8% ETA 0:01:37 ETA 18:52:06 [10.7MiB/s] [64.5MiB/s] [===> ] 8% ETA 0:01:47 ETA 18:52:17 [3.83MiB/s] [58.6MiB/s] [===> ] 8% ETA 0:01:57 ETA 18:52:28 [3.56MiB/s] [53.5MiB/s] [===> ] 8% ETA 0:02:06 ETA 18:52:38 [3.80MiB/s] [50.4MiB/s] [===> ] 8% ETA 0:02:16 ETA 18:52:49 [5.78MiB/s] [47.3MiB/s] [===> ] 8% ETA 0:02:26 ETA 18:53:00 [5.86MiB/s] [44.4MiB/s] [===> ] 8% ETA 0:02:34 ETA 18:53:09 [2.54MiB/s] [41.6MiB/s] [===> ] 8% ETA 0:02:44 ETA 18:53:20 [2.79MiB/s] [39.4MiB/s] [===> ] 8% ETA 0:02:53 ETA 18:53:30 [72.2MiB/s] [41.0MiB/s] [===> ] 9% ETA 0:02:46 ETA 18:53:24 [93.1MiB/s] [43.7MiB/s] [====> ] 10% ETA 0:02:34 ETA 18:53:13 [92.4MiB/s] [46.2MiB/s] [=====> ] 12% ETA 0:02:24 ETA 18:53:04 [67.3MiB/s] [47.2MiB/s] [======> ] 13% ETA 0:02:19 ETA 18:53:00 [92.9MiB/s] [49.2MiB/s] [======> ] 14% ETA 0:02:11 ETA 18:52:53 [87.6MiB/s] [50.9MiB/s] [=======> ] 15% ETA 0:02:05 ETA 18:52:48 [45.0MiB/s] [50.6MiB/s] [=======> ] 16% ETA 0:02:04 ETA 18:52:48 [48.6MiB/s] [50.6MiB/s] [=======> ] 16% ETA 0:02:04 ETA 18:52:49 [45.1MiB/s] [50.4MiB/s] [========> ] 17% ETA 0:02:04 ETA 18:52:50 [20.4MiB/s] [49.2MiB/s] [========> ] 17% ETA 0:02:06 ETA 18:52:53 [28.5MiB/s] [48.5MiB/s] [========> ] 17% ETA 0:02:08 ETA 18:52:56 [35.2MiB/s] [48.0MiB/s] [========> ] 18% ETA 0:02:08 ETA 18:52:57 [4.75MiB/s] [46.5MiB/s] [========> ] 18% ETA 0:02:12 ETA 18:53:02 [1.30MiB/s] [45.1MiB/s] [========> ] 18% ETA 0:02:16 ETA 18:53:07 [3.25MiB/s] [43.8MiB/s] [========> ] 18% ETA 0:02:20 ETA 18:53:12 [2.93MiB/s] [42.5MiB/s] [========> ] 18% ETA 0:02:24 ETA 18:53:17 [2.67MiB/s] [41.3MiB/s] [========> ] 18% ETA 0:02:28 ETA 18:53:22 [4.17MiB/s] [40.2MiB/s] [========> ] 18% ETA 0:02:32 ETA 18:53:27 [2.52MiB/s] [39.3MiB/s] [========> ] 18% ETA 0:02:36 ETA 18:53:32 [5.58MiB/s] [38.4MiB/s] [========> ] 18% ETA 0:02:40 ETA 18:53:37 [3.75MiB/s] [37.5MiB/s] [========> ] 18% ETA 0:02:43 ETA 18:53:41 [3.90MiB/s] [36.6MiB/s] [========> ] 18% ETA 0:02:47 ETA 18:53:46 [55.0MiB/s] [37.0MiB/s] [=========> ] 19% ETA 0:02:44 ETA 18:53:44 [47.9MiB/s] [37.3MiB/s] [==========> ] 20% ETA 0:02:41 ETA 18:53:42 [83.6MiB/s] [38.4MiB/s] [==========> ] 21% ETA 0:02:35 ETA 18:53:37 [72.3MiB/s] [39.2MiB/s] [===========> ] 22% ETA 0:02:30 ETA 18:53:33 [ 105MiB/s] [40.7MiB/s] [===========> ] 23% ETA 0:02:22 ETA 18:53:26 [93.8MiB/s] [41.9MiB/s] [============> ] 24% ETA 0:02:15 ETA 18:53:20 ^C $ Cheers, David.
