This article describes some of the commonly used features of Activity Monitor, a kind of task manager that allows you see how apps and other processes are affecting your CPU, memory, energy, disk, and network usage.
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Open Activity Monitor from the Utilities folder of your Applications folder, or use Spotlight to find it.
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Overview
The processes shown in Activity Monitor can be user apps, system apps used by macOS, or invisible background processes. Use the five category tabs at the top of the Activity Monitor window to see how processes are affecting your Mac in each category.
Add or remove columns in each of these panes by choosing View > Columns from the menu bar. The View menu also allows you to choose which processes are shown in each pane:
- All Processes
- All Processes Hierarchically: Processes that belong to other processes, so you can see the parent/child relationship between them.
- My Processes: Processes owned by your macOS user account.
- System Processes: Processes owned by macOS.
- Other User Processes: Processes that aren’t owned by the root user or current user.
- Active Processes: Running processes that aren’t sleeping.
- Inactive Processes: Running processes that are sleeping.
- Windowed Processes: Processes that can create a window. These are usually apps.
- Selected Processes: Processes that you selected in the Activity Monitor window.
- Applications in the last 8 hours: Apps that were running processes in the last 8 hours.
CPU
The CPU pane shows how processes are affecting CPU (processor) activity:
Click the top of the “% CPU” column to sort by the percentage of CPU capability used by each process. This information and the information in the Energy pane can help identify processes that are affecting Mac performance, battery runtime, temperature, and fan activity. https://alohaentrancement130.weebly.com/blog/hp-software-mfp-m130fw-mac-osx.
More information is available at the bottom of the CPU pane:
- System: The percentage of CPU capability currently used by system processes, which are processes that belong to macOS.
- User: The percentage of CPU capability currently used by apps that you opened, or by the processes those apps opened.
- Idle: The percentage of CPU capability not being used.
- CPU Load: The percentage of CPU capability currently used by all System and User processes. The graph moves from right to left and updates at the intervals set in View > Update Frequency. The color blue shows the percentage of total CPU capability currently used by user processes. The color red shows the percentage of total CPU capability currently used by system processes.
- Threads: The total number of threads used by all processes combined.
- Processes: The total number of processes currently running.
You can also see CPU or GPU usage in a separate window or in the Dock:
- To open a window showing current processor activity, choose Window > CPU Usage. To show a graph of this information in your Dock, choose View > Dock Icon > Show CPU Usage.
- To open a window showing recent processor activity, choose Window > CPU History. To show a graph of this information in your Dock, choose View > Dock Icon > Show CPU History.
- To open a window showing recent graphics processor (GPU) activity, choose Window > GPU History. Energy usage related to such activity is incorporated into the energy-impact measurements in the Energy tab of Activity Monitor.
Memory
The Memory pane shows information about how memory is being used:
More information is available at the bottom of the Memory pane:
- Memory Pressure: The Memory Pressure graph helps illustrate the availability of memory resources. The graph moves from right to left and updates at the intervals set in View > Update Frequency. The current state of memory resources is indicated by the color at the right side of the graph:
- Green: Memory resources are available.
- Yellow: Memory resources are still available but are being tasked by memory-management processes, such as compression.
- Red: Memory resources are depleted, and macOS is using your startup drive for memory. To make more RAM available, you can quit one or more apps or install more RAM. This is the most important indicator that your Mac may need more RAM.
- Physical Memory: The amount of RAM installed in your Mac.
- Memory Used: The total amount of memory currently used by all apps and macOS processes.
- App Memory: The total amount of memory currently used by apps and their processes.
- Wired Memory: Memory that can’t be compressed or paged out to your startup drive, so it must stay in RAM. The wired memory used by a process can’t be borrowed by other processes. The amount of wired memory used by an app is determined by the app's programmer.
- Compressed: The amount of memory in RAM that is compressed to make more RAM memory available to other processes. Look in the Compressed Mem column to see the amount of memory compressed for each process.
- Swap Used: The space used on your startup drive by macOS memory management. It's normal to see some activity here. As long as memory pressure is not in the red state, macOS has memory resources available.
- Cached Files: Memory that was recently used by apps and is now available for use by other apps. For example, if you've been using Mail and then quit Mail, the RAM that Mail was using becomes part of the memory used by cached files, which then becomes available to other apps. If you open Mail again before its cached-files memory is used (overwritten) by another app, Mail opens more quickly because that memory is quickly converted back to app memory without having to load its contents from your startup drive.
For more information about memory management, refer to the Apple Developer website.
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Energy
The Energy pane shows overall energy use and the energy used by each app:
- Energy Impact: A relative measure of the current energy consumption of the app. Lower numbers are better. A triangle to the left of an app's name means that the app consists of multiple processes. Click the triangle to see details about each process.
- Avg Energy Impact: The average energy impact for the past 8 hours or since the Mac started up, whichever is shorter. Average energy impact is also shown for apps that were running during that time, but have since been quit. The names of those apps are dimmed.
- App Nap: Apps that support App Nap consume very little energy when they are open but not being used. For example, an app might nap when it's hidden behind other windows, or when it's open in a space that you aren't currently viewing.
- Preventing Sleep: Indicates whether the app is preventing your Mac from going to sleep.
More information is available at the bottom of the Energy pane:
- Energy Impact: A relative measure of the total energy used by all apps. The graph moves from right to left and updates at the intervals set in View > Update Frequency.
- Graphics Card: The type of graphics card currently used. Higher–performance cards use more energy. Macs that support automatic graphics switching save power by using integrated graphics. They switch to a higher-performance graphics chip only when an app needs it. 'Integrated' means the Mac is currently using integrated graphics. 'High Perf.' means the Mac is currently using high-performance graphics. To identify apps that are using high-performance graphics, look for apps that show 'Yes' in the Requires High Perf GPU column.
- Remaining Charge: The percentage of charge remaining on the battery of a portable Mac.
- Time Until Full: The amount of time your portable Mac must be plugged into an AC power outlet to become fully charged.
- Time on AC: The time elapsed since your portable Mac was plugged into an AC power outlet.
- Time Remaining: The estimated amount of battery time remaining on your portable Mac.
- Time on Battery: The time elapsed since your portable Mac was unplugged from AC power.
- Battery (Last 12 hours): The battery charge level of your portable Mac over the last 12 hours. The color green shows times when the Mac was getting power from a power adapter.
As energy use increases, the length of time that a Mac can operate on battery power decreases. If the battery life of your portable Mac is shorter than usual, you can use the Avg Energy Impact column to find apps that have been using the most energy recently. Quit those apps if you don't need them, or contact the developer of the app if you notice that the app's energy use remains high even when the app doesn't appear to be doing anything.
Disk
The Disk pane shows the amount of data that each process has read from your disk and written to your disk. It also shows 'reads in' and 'writes out' (IO), which is the number of times that your Mac accesses the disk to read and write data.
The information at the bottom of the Disk pane shows total disk activity across all processes. The graph moves from right to left and updates at the intervals set in View > Update Frequency. The graph also includes a pop-up menu to switch between showing IO or data as a unit of measurement. The color blue shows either the number of reads per second or the amount of data read per second. The color red shows either the number of writes out per second or the amount of data written per second.
To show a graph of disk activity in your Dock, choose View > Dock Icon > Show Disk Activity.
Network
The Network pane shows how much data your Mac is sending or receiving over your network. Use this information to identify which processes are sending or receiving the most data.
The information at the bottom of the Network pane shows total network activity across all apps. The graph moves from right to left and updates at the intervals set in View > Update Frequency. The graph also includes a pop-up menu to switch between showing packets or data as a unit of measurement. The color blue shows either the number of packets received per second or the amount of data received per second. The color red shows either the number of packets sent per second or the amount of data sent per second.
To show a graph of network usage in your Dock, choose View > Dock Icon > Show Network Usage.
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Cache
In macOS High Sierra 10.13.4 or later, Activity Monitor shows the Cache pane when Content Caching is enabled in the Sharing pane of System Preferences. The Cache pane shows how much cached content that local networked devices have uploaded, downloaded, or dropped over time.
Use the Maximum Cache Pressure information to learn whether to adjust Content Caching settings to provide more disk space to the cache. Lower cache pressure is better. Learn more about cache activity.
The graph at the bottom shows total caching activity over time. Choose from the pop-up menu above the graph to change the interval: last hour, 24 hours, 7 days, or 30 days.
Learn more
- Learn about kernel task and why Activity Monitor might show that it's using a large percentage of your CPU.
- For more information about Activity Monitor, open Activity Monitor and choose Help > Activity Monitor. You can also see a short description of many items in the Activity Monitor window by hovering the mouse pointer over the item.
The Power Nap feature allows your Mac to run things in the background even while sleeping. In power nap mode, your Mac auto-checks for email updates your notifications and also downloads system updates without you needing to babysit the machine. The good news: it’s easy to set up the Power Nap feature on your Macbook. Rfid reader writer software mac free.
Contents
- 1 Which Macs use Power Nap?
- 2 What If I don’t want my Macbook to Sleep?
Which Macs use Power Nap?
The only downside is that this feature works with the relatively new MacBook, MacBook Airs, MacBook Pros, and Macs that have built-in flash storage. If your Macbook is from mid 2012s, you should be okay. Downloads during power nap only supported from Apps Available via the Mac App Store.
You can use Power Nap on these Mac models
- MacBook (Early 2015 and later)
- MacBook Air (Late 2010 and later)
- Requires OS X Mountain Lion v10.8.2 and later
- MacBook Pro (all models with Retina display)
- Mac mini (Late 2012 and later)
- iMac (Late 2012 and later)
- Mac Pro (Late 2013)
To Figure out if your Mac supports Power Nap
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Step – 1 Click on > System Preferences > Energy Saver
Step – 2 If your Macbook is compatible, the option appears as a checkbox on this screen in the “Battery” tab
Step – 3 Check the box “Enable Power Nap,” and your Mac is enabled for this mode
Power Napping Rules
All power naps have rules and limits, so too with Macs as with humans! The important caveat for your Mac is that to use parts of this feature, you must keep your Macbook plugged into a power source. If you do not see this option, it means that your Mac or MacBook is not compatible with the Power Nap feature.
It is important to note that certain features only work when your MacBook is connected to a power outlet while in sleep mode.
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Features that require power connection
- Software Updates Download
- Time Machine Backups
- Spotlight indexing
Features that work regardless of power while in sleep mode
- Mail App receiving new messages
- Calendars, Notes, and Reminders sync up across multiple devices
- Syncing of documents stored in iCloud
Power Nap Battery Requirements
If using your battery while power-napping, the model year of your MacBook determines how Power Nap responds to your battery power state. Computers with 2012 or an earlier year in the model name suspend Power Nap when the battery reaches a charge of 30% or less. MacBooks with 2013 or a later year in the model name use Power Nap until the battery is completely drained. Power Nap always resumes when you connect back to AC power.
Determine your Mac Model
- Choose About This Mac from the Apple menu in the upper-left corner of your screen
- About This Mac shows an overview of your Mac or MacBook, including the name and version of its operating system, its model name, and its serial number
What If I don’t want my Macbook to Sleep?
Many of our readers complain about a different problem altogether. They would like their MacBooks to not go into the sleep mode while they are in the process of updating their machines. No screen saver or Mac screen getting dimmer.
If you are trying to find out a way to control the sleep, screen saver feature on your Macbook, look no further than your Terminal Utility! Since OS X, Apple added a command line tool for sleep prevention called caffeinate. This command alters your Mac’s sleep behavior, allowing you to control and prevent your Mac from going into the sleep mode.
To Use Caffeinate
- Open a Terminal Window (Applications > Utilities > Terminal)
- Type in caffeinate
- Press Enter and your Mac stays awake for as long as you leave Terminal running
Want To Set A Specific Duration? Just Add a Timer!
- In Terminal, type in caffeinate -t
- Then, on the same line add in the duration you’d like in seconds (for example 30 minutes is 1800–30*60)
- Finally, on that same line add an Ampersand (&). This ends the argument so that the command runs in the background
- So the full command here is caffeinate -t 1800 &
- For MacBooks also add the command caffeinate-d to prevent your display from sleeping
Who knew that there were so many nuances around your Macbook’s sleeping habits? We hope that you found this quick Mac tip useful!
Obsessed with tech since the early arrival of A/UX on Apple, Sudz (SK) is responsible for the editorial direction of AppleToolBox. He is based out of Los Angeles, CA.
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Sudz specializes in covering all things macOS, having reviewed dozens of OS X and macOS developments over the years.
In a former life, Sudz worked helping Fortune 100 companies with their technology and business transformation aspirations.