cpu percentages in activity monitor?

Discussion in 'Mac Apps and Mac App Store' started by biohazard6969, Mar 27, 2005.

  1. biohazard6969 macrumors 6502a

    biohazard6969

    Joined:
    Feb 23, 2005
    Location:
    toronto canada
    #1
    hey, just a question, what are the different kinds of cpu percentages that are represented in activity monitor, theres User, System and Nice, i can basicly figure out that user would be any applications, and system is basicly everyday stuff, but what the heck is nice? i only saw it once an that when my computer was rele screwed up, so i dfon't think it is a good thing
     
  2. ddtlm macrumors 65816

    Joined:
    Aug 20, 2001
    #2
    Its programs set specifically to use only "extra" CPU cycles.
     
  3. varmit macrumors 68000

    varmit

    Joined:
    Aug 5, 2003
    #3
    A nice process is a process that when another process needs more cpu, nice processes will give up their cpu time to the other process that wants it. I can be stuff like maintenance process that can wait till later to run so it gives up what it was doing so you can surf the internet or something else.
     
  4. biohazard6969 thread starter macrumors 6502a

    biohazard6969

    Joined:
    Feb 23, 2005
    Location:
    toronto canada
    #4
    so this would happen like when the majority of the cpu is already taken up and somehting important needs to use some cpu that another program is using, so it will "borrow the cpu"? is this right....and when this happens, should i try to quit stuff, like is this a bad thing, cause when i get something usingg %nice, the machine is usually running really slowly
     
  5. kg9ov macrumors member

    Joined:
    Feb 12, 2005
    Location:
    In front of a computer...
    #5
    Not exactly. The majority of the programs that run have the same nice value. Programs that run with the same nice value get equal access to the available CPU resources. Also, the operating system does not dynamically adjust the nice value of a running program. It will remain the same unless you specifically change it.

    If you are seeing a non-zero value for %Nice, then one or more programs are running with a higher nice value than "normal". These programs would have less priority to get CPU time than programs that do have a "normal" nice value.

    No, seeing a non-zero value for %Nice is not necessarily a bad thing. Actually, if you are seeing a non-zero value for %Nice, the bottleneck slowing the machine down is probably not the CPU. In this case, you should probably look at memory or disk activity.

    Basically, the answer to "Is a non-zero %Nice value what is causing my system to be slow?" is everyones favorite. It depends. :D Any other answer without knowing more details about the specific program would be nothing more than speculation.

    -Tony
     

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