I am launching non interactive jobs using batch, and I would like to increase the load limiting factor in order to use all 8 of my cores. I am on Ubuntu 16.04 LTS.
From what I understand, batch uses atd to do the jobs. Jobs start when the load factor goes under a threshold, called the load limiting factor. It is said in the man of atd that we can change this factor using the -l option.
My question: how can I use this atd -l XX option? When I type, for instance, atd -l 7.2 before batch, it doesn't seem to be changing anything.
What I have found so far:
- In this question How to run bash script via multithreading, one contributor proposes to do this in the '
atdservice starting script'. I guess that it refers to the/etc/init.d/atd, but I do not know what to change there, cf next bullet point. - I have found pages, such as this one http://searchitchannel.techtarget.com/feature/Understanding-run-level-scripts-in-Fedora-11-and-RHEL, where they propose to: "modify the following line (in the start section) of the
/etc/init.d/atdscript:daemon /usr/sbin/atd. Replace it with this line, using the-largument to specify the new minimum system load value:daemon /usr/sbin/atd -l 1.6". However, there is no such a line in/etc/init.d/atd.
It seems that it can be introduced in the /etc/init.d/atd, but I do not know where. I have never changed such files.
So, how can I change the load limiting factor used by the batch command?
Best Answer
Found a solution:
/etc/init/atd.overrideexec atd -l 7.2sudo service atd restartIt has to do with how the 'Upstart init daemon' works. Explanations there: http://linux.die.net/man/5/init If the file
/etc/init/atd.overridealready exists with an line starting withexec, edit this line.