Sponsored Content
Top Forums Shell Programming and Scripting BASH Execution Delay / Speedup Post 302932983 by gmark99 on Monday 26th of January 2015 07:52:47 PM
Old 01-26-2015
BASH Execution Delay / Speedup

What the job does is take that line of the file that it's given as an argument and uses that to make seven or eight data accesses. Right now they're stubs, but in the future, they'll be accessing some hardware that may take awhile. Hence, spawning the job to run in background.

At first, I thought that running over 200 of these jobs as bogging down the machine. So I reduced the number, and reduced and reduced until I had a single job that made some accesses and exited. Still a huge delay at the end of the loop. But there's no testing there -- it's just supposed to return and run the loop again. The test for the line number in the file is in the inner loop. The outer loop continues reading a new copy of the external file *inside* the loop, not where the slowdown is occurring. Not knowing exactly what BASH is doing internally, I don't know what's going on at the head and footer of the loop. But it occasionally slows down a LOT.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

bash - delay expansion of variable

Hello - I have a bash script which does some logging, and I'd like to include the line number of the echo statement that pipes into $LOGGER: MYPID=$$ MYNAME=`basename $0` LOGGER="/usr/bin/logger -t $MYNAME($LINENO) -p daemon.error" ... echo 'this is an entry into the log file' | $LOGGER ... (3 Replies)
Discussion started by: scandora
3 Replies

2. Shell Programming and Scripting

Calculating delay time - bash

Hi, I am having the following problem. test > hourOfDay=06 ; delayTime=$(((9-$hourOfDay)*60)) ; echo $delayTime 180 test > hourOfDay=07 ; delayTime=$(((9-$hourOfDay)*60)) ; echo $delayTime 120 test > hourOfDay=08 ; delayTime=$(((9-$hourOfDay)*60)) ; echo $delayTime bash: (9-08: value... (5 Replies)
Discussion started by: jbsimon000
5 Replies

3. Shell Programming and Scripting

execution time / runtime -- bash script please help!

Hello, I'm running a bash script and I'd like to get more accurate a runtime information then now. So far I've been using this method: STARTM=`date -u "+%s"` ......... *script function.... ......... STOPM=`date -u "+%s"` RUNTIMEM=`expr $STOPM - $STARTM` if (($RUNTIMEM>59)); then... (6 Replies)
Discussion started by: TehOne
6 Replies

4. Shell Programming and Scripting

Optimize and Speedup the script

Hi All, There is a script (test.sh) which is taking more CPU usage. I am attaching the script in this thread. Could anybody please help me out to optimize the script in a better way. Thanks, Gobinath (6 Replies)
Discussion started by: ntgobinath
6 Replies

5. Shell Programming and Scripting

Splitting file needs speedup

I've got a large file (2-4 gigs), made up of 4 columns. I'd like to split the file into two, based on the 2nd column value being even or odd. The following script does the job, but runs incredibly slow--I'm not sure it will complete this week. There must be a clever way to do this with just... (2 Replies)
Discussion started by: I.P. Freeley
2 Replies

6. Shell Programming and Scripting

Execution Problems with bash script

Hello, can someone please help me to fix this script, I have a 2 files, one file has hostname information and second file has console information of the hosts in each line, I have written a script which actually reads each line in hostname file and should grep in the console file and paste the... (8 Replies)
Discussion started by: bobby320
8 Replies

7. Shell Programming and Scripting

Execution problems with BASH Shell Script

Hi I need help with my coding , first time I'm working with bash . What i must do is check if there is 3 .txt files if there is not 3 of them i must give an error code , if al three is there i must first arrange them in alphabetical order and then take the last word in al 3 of the .txt files... (1 Reply)
Discussion started by: linux newb
1 Replies

8. Shell Programming and Scripting

execution of a string being echoed in bash

hi all, I am trying to do a loop on a series of plotting function shown below: colorlist=(blue red green); n=0; for k in $xy; do psbasemap $range -JM$scale -B10g5 -X1 -Y1 -P -K > $outfile pscoast $range -JM$scale -B10g5 -D$res -P -W$lwidth -G$fill -O -K >> $outfile echo... (1 Reply)
Discussion started by: ida1215
1 Replies

9. Shell Programming and Scripting

How to simulate an execution queue with bash?

I'm running cygwin bash on windows 7 and I'm have some bat files that perform large builds and take a long time and a lot of memory. Therefor, I don't want to builds executing simultaneously (too much memory). How can I implement a queue so I can queue up multiple builds and only execute one... (2 Replies)
Discussion started by: siegfried
2 Replies

10. Shell Programming and Scripting

Why execution is different from orginal bash registry$database?

Hi all, here's my script #!/bin/ksh if then export DB_CREATE_PATH=`pwd` fi echo echo "********************--Menu--*****************************" echo "*** " echo "*** 1. Pre-Upgrade Steps "... (3 Replies)
Discussion started by: jediwannabe
3 Replies
break(1)                                                           User Commands                                                          break(1)

NAME
break, continue - shell built-in functions to escape from or advance within a controlling while, for, foreach, or until loop SYNOPSIS
sh break [n] continue [n] csh break continue ksh *break [n] *continue [n] DESCRIPTION
sh The break utility exits from the enclosing for or while loop, if any. If n is specified, break n levels. The continue utility resumes the next iteration of the enclosing for or while loop. If n is specified, resume at the n-th enclosing loop. csh The break utility resumes execution after the end of the nearest enclosing foreach or while loop. The remaining commands on the current line are executed. This allows multilevel breaks to be written as a list of break commands, all on one line. The continue utility continues execution of the next iteration of the nearest enclosing while or foreach loop. ksh The break utility exits from the enclosed for, while, until, or select loop, if any. If n is specified, then break n levels. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be exited. The continue utility resumes the next iteration of the enclosed for, while, until, or select loop. If n is specified then resume at the n- th enclosed loop. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words that follow a command preceded by ** that are in the format of a variable assignment are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign, and also that word splitting and file name genera- tion are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), exit(1), ksh(1), sh( 1), attributes(5) SunOS 5.10 17 Jul 2002 break(1)
All times are GMT -4. The time now is 11:34 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy