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There are a number of ways to view what s currently running on your Mac, both from the command line and using graphical tools. We ll start with the handy GUI utility, Activity Monitor, and then show you how to view things programmatically for those times when you feel like getting your geek on with the commands ps and top from the command line. NOTE: Before you can ps and top, you ll need to open a Terminal window (/Applications/Utilities/Terminal.app).
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The Activity Monitor
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To view the processes running on your Mac (along with other information related to those processes), go to Applications, select Utilities, and open the Activity Monitor application, as shown in Figure 2 1. Activity Monitor will show you a variety of resources in use on your system in real time. Activity Monitor has many uses. From disk activity to memory utilization, Activity Monitor provides a dashboard of sorts into what is going on in your computer. Our focus here, though, is specifically on which processes are running on the computer and learning a bit of information about each. By default, you ll only see what you re running under the account with which you re logged in. If you know the name of a given process, you can click in the Filter field and type the name of the process to constrain the view. You can also change which processes appear by going to the Show drop-down list box (see Figure 2 2). You can stop each of these processes, however, if you need to stop one that is owned by a user other than yourself. You ll need to provide an administrative password to do so. This is because each process is started by a user, and only has access to files and folders to which the user who started the process has access. When analyzing system processes, remember that processes should be run by the user with the least amount of privileges possible.
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CHAPTER 2: Services, Daemons, and Processes
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Figure 2 1. Mac OS X s Activity Monitor
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Figure 2 2. The Activity Monitor s Show list.
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Activity Monitor s Show options break down as follows: All Processes: Displays every process running on the system. All Processes, Hierarchically: Displays every process running on the system in a tree format, where child processes appear beneath their parent processes. My Processes: Displays processes running under the account with which you re logged in.
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CHAPTER 2: Services, Daemons, and Processes
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System Processes: Displays all processes run by your OS X administrator account. Other User Processes: Displays all processes run by other user accounts (not the account you re currently logged into, or the administrator). Expect to see processes running in this section even if you re the only person using your computer. OS X has a variety of internal users who were created only to run particular processes, such as the user _mdnsresponder to run the mDNSResponder multicast DNS service. Active Processes: Displays processes that are actively doing things rather than just idling and waiting for something to happen. Inactive Processes: Displays those processes that are currently in a waiting state and aren t actively doing anything. Windowed Processes: Displays all processes that are attached to windows on the desktop. Selected Processes: Displays only those processes that are currently selected. To choose a consecutive list of processes, click the first, and then Shift-click the last in the list. If you want to choose a nonconsecutive list, Command-click each process. To help you understand what you re looking at here, let s also look at the process listing columns from left to right, starting with PID. The PID, or Process ID, is a unique number assigned to each process when it s started. When viewing the listing in the All Processes, Hierarchically mode (see Figure 2 3), you ll notice that PID number 1 is always assigned to launchd, and PID number 0 is always assigned to kernel_task, as this is the order in which they are invoked at boot time.
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