Configuration Information:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -g -O2
uname output: Linux medium 5.10.0-12-amd64 #1 SMP Debian 5.10.103-1
(2022-03-07) x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu
Bash Version: 5.2
Patch Level: 0
Release Status: rc2
Description:
Trying some script under 5.2 beta, rc1 and rc2, I was surprised by
execution time.
In order to compare, I've tried to establish execution time of
elementar operations, like:
- {0..999} .`: {0..999}`
- 3x{0..9} `: {0..9}{0..9}{0..9}`
- readUt `read -r ut idl </proc/uptime`
- RE `[[ $cnt =~ ^[0-9]*\..*$ ]]`
- InLneStr `: <<<"Hello world!"`
- IncInt `int+=1`
- AccessRt `: "$EPOCHREALTIME"`
- PrintF `printf -v int '%s+%s' $int 1`
Here is results of my comparission between different version of bash:
(1st column show number of empty loop in 0.2 seconds as reference)
$ for((i=0;i<${#bashs[@]};i++)){ ${bashs[i]} timedTest.sh
${args[i]:--q};}
l/.2s {0..999} 3x{0..9} readUt RE InLneStr
IncInt AccessRt PrintF Version BuildDir
66222 330.31 338.28 13.17 19.02 63.16
0.08 2.69 1.18 5.0.17(1)-release /tmp/bash/bash-5.0/bash
73720 366.97 379.70 13.20 17.80 10.09
0.10 2.46 1.19 5.1.4(1)-release /bin/bash
60585 409.92 419.53 13.62 19.87 10.87
0.09 3.00 1.38 5.1.4(1)-release
/tmp/bash/bash-5.1.4/bash
62416 417.85 423.23 14.63 20.84 11.34
0.36 3.05 1.43 5.1.4(1)-release
/tmp/bash/bash-5.1.4/bash_dynlib
62538 416.97 439.28 13.65 20.69 12.51
0.29 3.05 1.57 5.1.4(1)-release
/tmp/bash/debian/bash-5.1/bash
60664 419.54 425.89 14.25 21.05 11.01
0.57 3.12 1.38 5.1.16(1)-release
/tmp/bash/bash-5.1.16/bash
40808 39995.10 39995.10 18.49 35.46 15.65
0.34 5.81 2.40 5.2.0(1)-beta
/tmp/bash/bash-5.2-beta/bash
40134 33328.35 39995.02 18.88 31.18 14.73
0.29 6.19 2.20 5.2.0(1)-rc1
/tmp/bash/bash-5.2-rc1/bash
40350 39995.04 39995.04 19.10 32.20 14.66
0.59 6.15 2.26 5.2.0(1)-rc2
/tmp/bash/bash-5.2-rc2/bash
Where if everything seem slower, accessing $EPOCHREALTIME like `prinf
-v INTEGER '%s+%s' $INTEGER 1` or
using Regular Expression use approx 2x more time, but a sequence of
1000 using brace expansion require 100x more time!!
Another test (first script I wrote) is something slower, but render
approx same results:
$ for((i=0;i<${#bashs[@]};i++)){ ${bashs[i]} looptest.sh
${args[i]:--q};}
l/.02s {0..999} 3x{0..9} readUt RE InLneStr
IncInt AccessRt PrintF Version BuildDir
1468 340.47 348.36 16.71 22.54 51.44
1.71 5.10 3.51 5.0.17(1)-release bash-5.0/bash
1714 366.64 380.21 15.11 20.11 12.23
1.33 3.99 2.35 5.1.4(1)-release /bin/bash
1074 414.53 423.91 15.91 22.94 12.78
1.72 4.77 2.54 5.1.4(1)-release bash-5.1.4/bash
1444 413.59 418.95 16.80 22.83 13.21
1.70 4.71 2.51 5.1.4(1)-release bash-5.1.4/bash_dynlib
1360 421.20 432.83 16.33 22.79 12.98
1.82 4.87 2.59 5.1.4(1)-release debian/bash-5.1/bash
1134 420.00 428.62 16.76 22.74 13.12
1.78 4.92 2.60 5.1.16(1)-release bash-5.1.16/bash
687 40158.21 40676.12 23.73 38.81 18.98
3.96 9.87 3.94 5.2.0(1)-beta bash-5.2-beta/bash
607 39559.71 40192.35 23.38 37.68 19.08
3.95 9.98 3.99 5.2.0(1)-rc1 bash-5.2-rc1/bash
740 40531.76 40965.16 24.38 37.99 19.13
3.94 10.05 3.95 5.2.0(1)-rc2 bash-5.2-rc2/bash
Repeat-By:
https://f-hauri.ch/vrac/timedTest.sh.txt
https://f-hauri.ch/vrac/looptest.sh.txt
--
Félix Hauri - <fe...@f-hauri.ch> - http://www.f-hauri.ch
