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Top Forums Shell Programming and Scripting Parallelize bash commands/jobs Post 302974533 by yifangt on Tuesday 31st of May 2016 12:39:54 PM
Old 05-31-2016
Parallelize bash commands/jobs

Hello,
I have a bunch of jobs (cp, cat or ln -s) on big files (10xGB in size):
Code:
# commands_script.sh: 
cp file1 path1/newfile1
cp file2 path1/newfile2
cp file3 path1/newfile3
......
cat file11 path2/file21 path1/newfile11
cat file12 path2/file22 path1/newfile12
cat file13 path2/file23 path1/newfile13
......
ln -s path3/file51 path1/newfile51
ln -s path3/file52 path1/newfile52
ln -s path3/file53 path1/newfile53
......

One command at a line!
I can send them into background by adding & at the end of each line, but then all at once the server (24 cores) get over-loaded with my 100x jobs.
Or, I can run the bash script, so that the jobs are run one-by-one, then the available cores my admin assigned me (8 ~ 16 normally) are not fully used.
The challenge is the file names of each line are so random that it is hard to script into nice format for loops or regex.
I was thinking there may be some way like but I am not sure the exact option:
Code:
cat commands_script.sh | parallel -j16 sth-not-sure

How to use the parallel for my case to spread the jobs to available cores and speed up the work?
Thanks!

Last edited by yifangt; 05-31-2016 at 01:57 PM..
 

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atrm(1) 							   User Commands							   atrm(1)

NAME
atrm - remove jobs spooled by at or batch SYNOPSIS
atrm [-afi] [ [ job #] [user...]] DESCRIPTION
The atrm utility removes delayed-execution jobs that were created with the at(1) command, but have not yet executed. The list of these jobs and associated job numbers can be displayed by using atq(1). atrm removes each job-number you specify, and/or all jobs belonging to the user you specify, provided that you own the indicated jobs. You can only remove jobs belonging to other users if you have solaris.jobs.admin privileges. OPTIONS
The following options are supported: -a All. Removes all unexecuted jobs that were created by the current user. If invoked by the privileged user, the entire queue will be flushed. -f Force. All information regarding the removal of the specified jobs is suppressed. -i Interactive. atrm asks if a job should be removed. If you respond with a y, the job will be removed. FILES
/var/spool/cron/atjobs spool area for at jobs ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
at(1), atq(1), auths(1), cron(1M), auth_attr(4), attributes(5) SunOS 5.10 13 Aug 1999 atrm(1)
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