Re: git replace --edit for updating commit messages (was: Is it time to drop ChangeLogs?)

[Noam Postavsky <npostavs@users.sourceforge.net>]

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On Thu, Jul 28, 2016 at 10:43 AM, Eli Zaretskii <eliz@gnu.org> wrote:
>
> Thanks.  But I think a more relevant timing would be one for something
> like 1% to 10% of replaced messages, because we will never have all of
> them replaced.

I made a script to collect some more timings at different replacement
levels. Script and timings attached. The time needed grows linearly
per number of replacements. Looking at the time for git log | head
(which I believe is representative of the how long it takes to get
something onscreen from a normal git log with pager),  I'd say it's
big enough to be annoying (10th of a second) starting from around 4000
replacements (that's roughly 3%).

[-- Attachment #2: full-log-times.txt --]
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#	real	user	sys
0	4.41	2.85	1.53
1000	4.76	2.96	1.76
2000	5.43	3.15	2.24
3000	6.11	3.31	2.76
4000	7.28	3.52	3.73
5000	8.33	3.57	4.73
6000	9.60	3.62	5.94
7000	11.25	3.86	7.35
8000	12.27	3.86	8.36
9000	13.07	4.02	8.98
10000	13.65	4.20	9.40
11000	14.11	4.37	9.69
12000	14.04	4.14	9.85
13000	14.28	4.28	9.95
14000	14.51	4.23	10.23
15000	15.22	4.26	10.90
16000	15.46	4.31	11.08
17000	16.12	4.30	11.74
18000	16.89	4.59	12.25
19000	17.39	4.66	12.68
20000	18.41	4.69	13.65
21000	18.96	4.70	14.20
22000	19.67	4.99	14.62
23000	20.29	4.92	15.31
24000	20.81	5.06	15.67
25000	21.68	5.20	16.38
26000	22.17	5.17	16.93
27000	22.71	5.56	17.05
28000	23.69	5.43	18.19
29000	24.22	5.54	18.56
30000	24.82	5.51	19.21
31000	25.47	5.70	19.68
32000	26.21	5.82	20.28
33000	26.50	5.53	20.88
34000	27.17	5.76	21.31
35000	27.66	5.96	21.62
36000	28.33	6.09	22.16
37000	29.13	5.71	23.32
38000	30.10	6.43	23.57
39000	30.32	6.10	24.13
40000	30.97	6.16	24.68
41000	31.65	6.27	25.27
42000	32.36	6.46	25.78
43000	32.91	6.57	26.24
44000	33.59	6.50	26.95
45000	34.30	6.65	27.51
46000	34.92	6.73	28.07
47000	35.52	6.65	28.75
48000	36.12	6.90	29.08
49000	36.75	7.37	29.25
50000	37.42	6.96	30.33

[-- Attachment #3: git-replace-some.sh --]
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[-- Attachment #4: log-times.txt --]
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#	real	user	sys
0	0.00	0.00	0.00
1000	0.01	0.00	0.01
2000	0.04	0.02	0.02
3000	0.06	0.03	0.03
4000	0.10	0.05	0.05
5000	0.15	0.04	0.10
6000	0.19	0.08	0.10
7000	0.25	0.06	0.17
8000	0.30	0.11	0.17
9000	0.34	0.12	0.19
10000	0.35	0.11	0.22
11000	0.36	0.16	0.19
12000	0.37	0.14	0.21
13000	0.37	0.13	0.22
14000	0.39	0.13	0.24
15000	0.44	0.19	0.22
16000	0.46	0.17	0.24
17000	0.48	0.20	0.26
18000	0.50	0.22	0.24
19000	0.54	0.18	0.33
20000	0.58	0.22	0.33
21000	0.60	0.25	0.30
22000	0.63	0.22	0.37
23000	0.66	0.25	0.38
24000	0.70	0.27	0.37
25000	0.78	0.24	0.43
26000	0.78	0.27	0.43
27000	0.76	0.25	0.48
28000	0.85	0.31	0.46
29000	0.94	0.34	0.45
30000	0.93	0.31	0.52
31000	0.90	0.36	0.48
32000	1.01	0.32	0.55
33000	1.03	0.39	0.52
34000	0.97	0.40	0.53
35000	1.00	0.37	0.57
36000	1.02	0.41	0.57
37000	1.06	0.45	0.55
38000	1.07	0.43	0.59
39000	1.12	0.42	0.63
40000	1.14	0.45	0.61
41000	1.14	0.38	0.70
42000	1.21	0.53	0.62
43000	1.20	0.45	0.68
44000	1.26	0.45	0.73
45000	1.26	0.47	0.72
46000	1.30	0.55	0.67
47000	1.34	0.57	0.69
48000	1.34	0.53	0.73
49000	1.41	0.56	0.78
50000	1.43	0.59	0.76