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FOR /F and var TEMP , TMP, USERPROFILE
Posted: 15 Jul 2014 17:22
by einstein1969
Hi,
I have notated that the for command in the form of "execute command" depend from these variables.
If all these variables are not defined the execution time increase (doubles or more)
This is the code for probe:
Code: Select all
@echo off & setlocal EnableDelayedExpansion
set "t0=!time!"
For /L %%N in (1,1,500) do (
for /F "Tokens=1 delims=" %%v in ('set') do rem
)
set "t1=!time!"
call :difftime
echo(
set "TEMP="
set "USERPROFILE="
set "TMP="
set "t0=!time!"
For /L %%N in (1,1,500) do (
for /F "Tokens=1 delims=" %%v in ('set') do rem
)
set "t1=!time!"
call :difftime
exit /b
:difftime
for /F "tokens=1-8 delims=:.," %%a in ("!t0: =0!:!t1: =0!") do set /a "a=(((1%%e-1%%a)*60)+1%%f-1%%b)*6000+1%%g%%h-1%%c%%d, a+=(a>>31) & 8640000"
echo %t0% - %t1% Elapsed %a% cs
exit /b
I have tested only on windows 7 32bit:
Code: Select all
1:14:48,77 - 1:14:53,12 Elapsed 435 cs
1:14:53,13 - 1:15:03,79 Elapsed 1066 cs
can someone confirm?
EDIT:little modify in code for better understanding.
einstein1969
Re: FOR /F and var TEMP , TMP, USERPROFILE
Posted: 15 Jul 2014 17:55
by Squashman
I am not understanding your example or what you are trying to test.
Re: FOR /F and var TEMP , TMP, USERPROFILE
Posted: 15 Jul 2014 18:42
by einstein1969
Squashman wrote:I am not understanding your example or what you are trying to test.
The example run 500 times a FOR /F loop and timing this.
Then after deleting from environment all 3 variables, redo the timing.
The results show that the second execution is slower.
I don't know why...
you can probe and post your result for confirm?
EDIT: I have modify the code in previus post
einstein1969
Re: FOR /F and var TEMP , TMP, USERPROFILE
Posted: 15 Jul 2014 19:42
by foxidrive
It only occurs when clearing the %temp% variable
with all variables
11:39:20.48 - 11:39:21.84 Elapsed 136 cs
11:39:21.84 - 11:39:23.19 Elapsed 135 cs
11:39:23.19 - 11:39:24.55 Elapsed 136 cs
11:39:24.55 - 11:39:25.91 Elapsed 136 cs
11:39:25.92 - 11:39:27.29 Elapsed 137 cs
removing userprofile
11:39:27.29 - 11:39:28.66 Elapsed 137 cs
11:39:28.66 - 11:39:30.02 Elapsed 136 cs
11:39:30.02 - 11:39:31.37 Elapsed 135 cs
11:39:31.38 - 11:39:32.74 Elapsed 136 cs
11:39:32.74 - 11:39:34.10 Elapsed 136 cs
removing tmp
11:39:34.10 - 11:39:35.46 Elapsed 136 cs
11:39:35.46 - 11:39:36.81 Elapsed 135 cs
11:39:36.81 - 11:39:38.16 Elapsed 135 cs
11:39:38.16 - 11:39:39.51 Elapsed 135 cs
11:39:39.51 - 11:39:40.87 Elapsed 136 cs
removing temp
11:39:40.88 - 11:39:42.80 Elapsed 192 cs
11:39:42.80 - 11:39:44.71 Elapsed 191 cs
11:39:44.72 - 11:39:46.62 Elapsed 190 cs
11:39:46.63 - 11:39:48.53 Elapsed 190 cs
11:39:48.54 - 11:39:50.45 Elapsed 191 cs
Re: FOR /F and var TEMP , TMP, USERPROFILE
Posted: 15 Jul 2014 20:12
by Aacini
FOR /F ... in ('command') must execute the command and store all its output in a temporary file, and then process this file to populate the %%P arameter in each cyle, so I can only guess that the file is stored in the directory given by %temp% variable and, if it is not found, it must find another place to create the temporary file, process that should take more time. I could bet that this problem don't happen if just a string is processed, instead of execute a command...
Antonio
Re: FOR /F and var TEMP , TMP, USERPROFILE
Posted: 15 Jul 2014 20:23
by foxidrive
This replaces the 'set' command with a number of echo statements.
There is no difference in execution time now.
with all variables
12:21:18.51 - 12:21:19.90 Elapsed 139 cs
12:21:19.90 - 12:21:21.29 Elapsed 139 cs
12:21:21.29 - 12:21:22.68 Elapsed 139 cs
12:21:22.68 - 12:21:24.07 Elapsed 139 cs
12:21:24.08 - 12:21:25.52 Elapsed 144 cs
removing temp
12:21:25.53 - 12:21:26.92 Elapsed 139 cs
12:21:26.92 - 12:21:28.32 Elapsed 140 cs
12:21:28.32 - 12:21:29.72 Elapsed 140 cs
12:21:29.72 - 12:21:31.12 Elapsed 140 cs
12:21:31.12 - 12:21:32.54 Elapsed 142 cs
Press any key to continue . . .
Code: Select all
@echo off
echo with all variables
for /L %%a in (1,1,5) do call b1
goto :a
echo removing userprofile
set "USERPROFILE="
for /L %%a in (1,1,5) do call b1
echo removing tmp
set "TMP="
for /L %%a in (1,1,5) do call b1
:a
echo removing temp
set "TEMP="
for /L %%a in (1,1,5) do call b1
pause
Code: Select all
@echo off & setlocal EnableDelayedExpansion
set "t0=!time!"
For /L %%N in (1,1,500) do (
for /F "delims=" %%v in ('
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
') do rem
)
set "t1=!time!"
call :difftime
exit /b
:difftime
for /F "tokens=1-8 delims=:.," %%a in ("!t0: =0!:!t1: =0!") do set /a "a=(((1%%e-1%%a)*60)+1%%f-1%%b)*6000+1%%g%%h-1%%c%%d, a+=(a>>31) & 8640000"
echo %t0% - %t1% Elapsed %a% cs
exit /b
Re: FOR /F and var TEMP , TMP, USERPROFILE
Posted: 16 Jul 2014 06:15
by einstein1969
foxidrive wrote:It only occurs when clearing the %temp% variable
with all variables
11:39:20.48 - 11:39:21.84 Elapsed 136 cs
11:39:21.84 - 11:39:23.19 Elapsed 135 cs
11:39:23.19 - 11:39:24.55 Elapsed 136 cs
11:39:24.55 - 11:39:25.91 Elapsed 136 cs
11:39:25.92 - 11:39:27.29 Elapsed 137 cs
removing userprofile
11:39:27.29 - 11:39:28.66 Elapsed 137 cs
11:39:28.66 - 11:39:30.02 Elapsed 136 cs
11:39:30.02 - 11:39:31.37 Elapsed 135 cs
11:39:31.38 - 11:39:32.74 Elapsed 136 cs
11:39:32.74 - 11:39:34.10 Elapsed 136 cs
removing tmp
11:39:34.10 - 11:39:35.46 Elapsed 136 cs
11:39:35.46 - 11:39:36.81 Elapsed 135 cs
11:39:36.81 - 11:39:38.16 Elapsed 135 cs
11:39:38.16 - 11:39:39.51 Elapsed 135 cs
11:39:39.51 - 11:39:40.87 Elapsed 136 cs
removing temp
11:39:40.88 - 11:39:42.80 Elapsed 192 cs
11:39:42.80 - 11:39:44.71 Elapsed 191 cs
11:39:44.72 - 11:39:46.62 Elapsed 190 cs
11:39:46.63 - 11:39:48.53 Elapsed 190 cs
11:39:48.54 - 11:39:50.45 Elapsed 191 cs
I seem that occour in more complicated mode
Try this:
Code: Select all
@echo off
setlocal
echo with all variables
for /L %%a in (1,1,5) do call b1
rem goto :a
echo removing temp
set "TEMP="
for /L %%a in (1,1,5) do call b1
echo removing tmp
set "TMP="
for /L %%a in (1,1,5) do call b1
:a
echo removing userprofile
set "USERPROFILE="
for /L %%a in (1,1,5) do call b1
pause
result:
Code: Select all
with all variables
12:42:24,48 - 12:42:29,01 Elapsed 453 cs
12:42:29,01 - 12:42:33,54 Elapsed 453 cs
12:42:33,56 - 12:42:38,03 Elapsed 447 cs
12:42:38,03 - 12:42:43,07 Elapsed 504 cs
12:42:43,09 - 12:42:48,00 Elapsed 491 cs
removing temp
12:42:48,00 - 12:42:55,26 Elapsed 726 cs
12:42:55,28 - 12:43:01,32 Elapsed 604 cs
12:43:01,32 - 12:43:07,39 Elapsed 607 cs
12:43:07,40 - 12:43:12,34 Elapsed 494 cs
12:43:12,35 - 12:43:18,81 Elapsed 646 cs
removing tmp
12:43:18,81 - 12:43:23,73 Elapsed 492 cs
12:43:23,75 - 12:43:28,51 Elapsed 476 cs
12:43:28,53 - 12:43:33,10 Elapsed 457 cs
12:43:33,10 - 12:43:37,68 Elapsed 458 cs
12:43:37,68 - 12:43:42,40 Elapsed 472 cs
removing userprofile
12:43:42,42 - 12:43:53,39 Elapsed 1097 cs
12:43:53,39 - 12:44:04,31 Elapsed 1092 cs
12:44:04,31 - 12:44:15,23 Elapsed 1092 cs
12:44:15,23 - 12:44:26,15 Elapsed 1092 cs
12:44:26,15 - 12:44:37,06 Elapsed 1091 cs
b1 is unchanged but your machine is faster. You may need to lift the loop from 500 to 1000 or more
einstein1969
Re: FOR /F and var TEMP , TMP, USERPROFILE
Posted: 16 Jul 2014 06:46
by einstein1969
foxidrive wrote:This replaces the 'set' command with a number of echo statements.
There is no difference in execution time now.
with all variables
12:21:18.51 - 12:21:19.90 Elapsed 139 cs
12:21:19.90 - 12:21:21.29 Elapsed 139 cs
12:21:21.29 - 12:21:22.68 Elapsed 139 cs
12:21:22.68 - 12:21:24.07 Elapsed 139 cs
12:21:24.08 - 12:21:25.52 Elapsed 144 cs
removing temp
12:21:25.53 - 12:21:26.92 Elapsed 139 cs
12:21:26.92 - 12:21:28.32 Elapsed 140 cs
12:21:28.32 - 12:21:29.72 Elapsed 140 cs
12:21:29.72 - 12:21:31.12 Elapsed 140 cs
12:21:31.12 - 12:21:32.54 Elapsed 142 cs
Press any key to continue . . .
Code: Select all
@echo off
echo with all variables
for /L %%a in (1,1,5) do call b1
goto :a
echo removing userprofile
set "USERPROFILE="
for /L %%a in (1,1,5) do call b1
echo removing tmp
set "TMP="
for /L %%a in (1,1,5) do call b1
:a
echo removing temp
set "TEMP="
for /L %%a in (1,1,5) do call b1
pause
Code: Select all
@echo off & setlocal EnableDelayedExpansion
set "t0=!time!"
For /L %%N in (1,1,500) do (
for /F "delims=" %%v in ('
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
echo a^&
') do rem
)
set "t1=!time!"
call :difftime
exit /b
:difftime
for /F "tokens=1-8 delims=:.," %%a in ("!t0: =0!:!t1: =0!") do set /a "a=(((1%%e-1%%a)*60)+1%%f-1%%b)*6000+1%%g%%h-1%%c%%d, a+=(a>>31) & 8640000"
echo %t0% - %t1% Elapsed %a% cs
exit /b
I have tested and seem that affect "echo" . I thinks every command...
re-try this:
Code: Select all
@echo off
setlocal
echo with all variables
for /L %%a in (1,1,5) do call b1
rem goto :a
echo removing temp
set "TEMP="
for /L %%a in (1,1,5) do call b1
echo removing tmp
set "TMP="
for /L %%a in (1,1,5) do call b1
:a
echo removing userprofile
set "USERPROFILE="
for /L %%a in (1,1,5) do call b1
endlocal
result:
Code: Select all
with all variables
14:37:41,47 - 14:37:45,86 Elapsed 439 cs
14:37:45,88 - 14:37:50,32 Elapsed 444 cs
14:37:50,32 - 14:37:54,77 Elapsed 445 cs
14:37:54,79 - 14:37:59,19 Elapsed 440 cs
14:37:59,19 - 14:38:03,64 Elapsed 445 cs
removing temp
14:38:03,66 - 14:38:08,10 Elapsed 444 cs
14:38:08,10 - 14:38:12,77 Elapsed 467 cs
14:38:12,77 - 14:38:17,72 Elapsed 495 cs
14:38:17,72 - 14:38:22,14 Elapsed 442 cs
14:38:22,14 - 14:38:26,55 Elapsed 441 cs
removing tmp
14:38:26,57 - 14:38:30,96 Elapsed 439 cs
14:38:30,97 - 14:38:35,35 Elapsed 438 cs
14:38:35,36 - 14:38:39,80 Elapsed 444 cs
14:38:39,82 - 14:38:44,30 Elapsed 448 cs
14:38:44,32 - 14:38:48,80 Elapsed 448 cs
removing userprofile
14:38:48,82 - 14:38:59,47 Elapsed 1065 cs
14:38:59,49 - 14:39:10,13 Elapsed 1064 cs
14:39:10,14 - 14:39:20,71 Elapsed 1057 cs
14:39:20,72 - 14:39:31,36 Elapsed 1064 cs
14:39:31,38 - 14:39:41,97 Elapsed 1059 cs
einstein1969
Re: FOR /F and var TEMP , TMP, USERPROFILE
Posted: 16 Jul 2014 06:49
by Squashman
einstein1969 wrote:EDIT: I have modify the code in previus post
einstein1969
Yes that makes more sense. You had your SET statements in the wrong spot to test your hypothesis.
Re: FOR /F and var TEMP , TMP, USERPROFILE
Posted: 16 Jul 2014 07:25
by foxidrive
When using the echo a commands in b1.bat and increasing the loop to 5000 I got these results:
with all variables
23:05:37.13 - 23:05:51.50 Elapsed 1437 cs
23:05:51.50 - 23:06:05.84 Elapsed 1434 cs
23:06:05.84 - 23:06:20.29 Elapsed 1445 cs
removing userprofile
23:06:20.29 - 23:06:34.67 Elapsed 1438 cs
23:06:34.67 - 23:06:49.40 Elapsed 1473 cs
23:06:49.40 - 23:07:03.96 Elapsed 1456 cs
removing tmp
23:07:03.96 - 23:07:18.38 Elapsed 1442 cs
23:07:18.38 - 23:07:32.67 Elapsed 1429 cs
23:07:32.67 - 23:07:47.28 Elapsed 1461 cs
removing temp
23:07:47.28 - 23:08:06.94 Elapsed 1966 cs
23:08:06.94 - 23:08:26.58 Elapsed 1964 cs
23:08:26.58 - 23:08:46.24 Elapsed 1966 cs
Press any key to continue . . .
and a second run with a different order:
with all variables
23:09:33.87 - 23:09:47.94 Elapsed 1407 cs
23:09:47.94 - 23:10:02.03 Elapsed 1409 cs
23:10:02.03 - 23:10:16.22 Elapsed 1419 cs
removing temp
23:10:16.23 - 23:10:30.71 Elapsed 1448 cs
23:10:30.71 - 23:10:44.80 Elapsed 1409 cs
23:10:44.80 - 23:10:59.03 Elapsed 1423 cs
removing userprofile
23:10:59.04 - 23:11:13.21 Elapsed 1417 cs
23:11:13.22 - 23:11:27.40 Elapsed 1418 cs
23:11:27.41 - 23:11:41.55 Elapsed 1414 cs
Press any key to continue . . .