Not all of my CPU is being used! (Lots of idle CPU)

Discussion in 'Mac Basics and Help' started by smilezz-, Sep 20, 2013.

  1. smilezz-, Sep 20, 2013
    Last edited: Sep 20, 2013

    macrumors newbie

    Sep 20, 2013
    My applications will run at 100% cpu but it says my cpu is at 25% user and 70% idle can anyone give me a solution where it uses more of my idle cpu?

    Here's a screenshot of my Activity Monitor:

    Also I've got a 2010 Macbook Pro, 4gb RAM, 2.4 GHz, Intel Core i5.
  2. macrumors 601

    Anonymous Freak

    Dec 12, 2002
    The "% CPU" column in the table refers to percent of a single CPU core.

    The listing at the bottom refers to TOTAL CPU usage, among all CPU cores. The graphs to the right of that show each core individually.

    In your case, you have a quad-core (four cores) CPU. Thus, one CPU at 100% equals 25% of your total.

    On my older, dual-core iMac, Minecraft often takes up over 100% CPU, which means it uses one CPU core completely, plus a decent amount of the second core. (In a test just now, I got it to hit 154% for a moment.)
  3. macrumors 68020

    Feb 19, 2011
    Or in this case, 2 cores w/ HT.
  4. thread starter macrumors newbie

    Sep 20, 2013
    Cheers man I thought I was overworking the cpu's, guess I'm underusing them.
  5. macrumors 68020

    Jun 15, 2012
    FYI, you can't make an application "use more CPU" than it needs. An application is sequence of instructions for the CPU. The CPU will execute them as fast as it can.

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