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UGU: Unix Guru Universe - Unix Tip #4155- June 27, 2012
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Unix Tip #4155- June 27, 2012
PERFORMANCE OF CROND TASKS
A good tip for getting better performance in crond tasks
is choosing a better time for launching them.
If the process that we want to launch needs few time,
but can overload the system easily, you can launch
the task in hours that the work is busy and -and HERE
is the tip- in strange minutes. That's why lots of
people launch their crons at midnight, but
nobody uses to do it at 00:13, in example.
That tip can obtain his best in hourly-launched
tasks. If that kind of tasks are launched all at
the same time, the system will overload without
any use. You can delay that kind of tasks (one
at 13th minute, other at 17th minute,other at
27th minute...) and obtain better performance
without work. That will avoid overloading caused
by launching several tasks at the same time.
The best is that administration tasks do
not overlap, but this is not always possible.
If you can do it, it's better you do it.
Using nice is also a good idea.
But the best is making a log of the uptime during
a week. You can be surprise, because all the staff
of a department of a firm use to do the coffee-break
at the same time; it's the perfect time for making
some administrative tasks. :-)
But do not clear the forbidden extensions -the famous
find /home -name core -exec \{\} \; and other stuff
like tmps, ~s and so on- of the system
at work time, or you will have a queue of staff people
very, very angry knocking at your door.
This tip generously supported by: irbis@activanet.es
NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted
by various unix admins around the globe. UGU suggest you read and
test each tip in a non-volitile environment before placing into
production.
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