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Shell Programming and Scripting

command faster in crontab..

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# 1  
Old 06-30-2009
command faster in crontab..
Hi all you enlightened unix people,

I've been trying to execute a perl script that contains the following line within backticks:

Code:
`grep -f patternfile.txt otherfile.txt`;

It takes normally 2 minutes to execute this command from the bash shell by hand.
I noticed that when i run this command from crontab.. it's much more faster... within 10 seconds the file is created... i'm trying to solve this issue.. do you have any clues??

Thx

F
# 2  
Old 06-30-2009
One possibility I can think of - the cron job is running at high priority. Another possibility is that the job runs at off hours when the system-wide I/O load is a lot less then during the day when you run your command from the prompt...
# 3  
Old 07-01-2009
Hmm, yes i did a check on the priority with top and they both have priority 20, and i executed both commands with the same load on the server. The grep results are the same.. very strange
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