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Mac OS X  |  System / Utilities  |  Maintenance / Optimization  |  App Stop  |  Great, just minor issues

App Stop

App Stop

pause, resume, and set processor priorities of applications

Version:  2.1

   [ Views: 646 ]

Great, just minor issues

Feedback Type:  Review

Contributed by: lains_navi Sunday, June 26 2005 @ 05:59 PM PDT

Product Platform: MacOSX

Used Product For: 1-6 months

Recommend Product: YES

This is a great app. It's great for slow computers like mine.
I've only seen one problem w/ it. It has to do w/ the new priority setting. I'm glad this was added, but It appears to be backwards. As in, low makes it the maximum priority and maximum makes in the lowest priority. It's an easy mistake since -20 is max and 20 is minimum. It threw me off the first time I started tinkering w/ priorities in OS X.
Other than that, it works great!   
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Comments

2 comments |

Great, just minor issues - tourette

I think the author was just keeping inline with Unix process pritority numbering. The lower the number the highest priority sort like being 1st in line.

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Tuesday, June 28 2005 @ 03:40 PM PDT


Great, just minor issues - rcfa

Exactly.
The utility is a front end (or equivalent) for the nice/renice commands as well as a means to send a program a SIGSTOP and SIGCONT signal, which you could also do with
kill -STOP <pid>
respectively
kill -CONT <pid>

Negative priorities require root privilege, and that for good reason, because you can mess things up if a process has a higher priority than some cooperating process that is responsible for IO. You can potentially deadlock a process that way.

Since processes are assigned CPU time in a priority queue, low number means high priority, exactly as in a queue: if you're first, you have top priority. The negative numbers are only an extension of the concept, because if you go below 1 you end up in negative territory. That is also a much better way of making obvious what is normally reserved for system purposes (positive user, negative system) than if you had to remember 40-20 is user and 0-19 is system...

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Thursday, July 07 2005 @ 03:58 AM PDT