![]() Data read/sec: The speed at which data read is occurring.Data written: The total of data written to the storage device.Data read: The total of data read from the storage device.Write out/sec: The rate of write operations performed (IO).Read in/sec: The rate of read operations performed (IO).Writes out: The number of times data has been written to the storage device.Read in: The total number of times a read from the storage device has occurred.PID: A unique number assigned as an ID to each process.Īt the bottom of the display are total values for the following categories:.Kind: Displays whether the app is 32-bit or 64-bit.Bytes Read: The number of bytes read by the process from the storage device.Bytes Written: The total number of bytes written by the process to the storage device.When you select the Disk tab, you’ll see the following categories for each listed process: Together the data and IO numbers give you a good read of how well your storage system is performing. Besides the amount of data, the number of read ins and write outs (IO), essentially how many times the storage system is accessed, are also tracked. The Disk section of Activity Monitor measures how much data each process has read from and written to your storage device. You should only use the Energy Impact numbers as a guide, and not an exact representation of energy consumed by a process. There are also disk and network impacts that have to be included to produce the Energy Impact and Avg Energy Impact numbers. There is no hardware within the Mac that can directly make these types of measurements, but it can be derived from measuring CPU and GPU impact, as well as wakeup impact and App Nap impact. (Use the Energy tab to see how each process impacts your Mac’s energy use.Ībout Energy Impact and Avg Energy Impact: Apple has to do some guesswork to determine the amount of energy used on a process-by-process basis. Note: The energy categories shown are dependent on the type of Mac you have and the hardware it contains. Battery: The battery charge level over the past 12 hours.Time on battery: The elapsed time that you’ve been powering the Mac from the battery.Time remaining: Estimate of the amount of time available from the battery.Time on AC: Time elapsed since the Mac was plugged into an AC outlet.Time until full: The amount of time needed to fully charge the battery.Remaining charge: Percent of remaining battery charge. ![]() ![]() Graphics Card: The current graphics card in use.Energy Impact: A graph showing energy use over time.User: The owner of the running process.Īt the bottom of the display you’ll see overall totals for energy in the following categories:.Requires High Perf GPU: If your Mac has multiple GPUs, this category displays if the app requires the higher performance GPU, thus requiring more energy use.Preventing Sleep: Shows if the app is preventing your Mac from sleeping.App Nap: Status of App Nap capabilities of the selected app.Avg Energy Impact: The average impact the app has had on energy consumption over the last 8 hours, or since the Mac was started up, whichever is shorter.Energy Impact: Measures the current energy consumption of the app (lower numbers are better).It also helps keep the tab well organized.Īctivity Monitor displays how each group and individual process is affecting your Mac’s energy use using the following categories: This allows you to dig down through related processes to find the one that’s the energy hog. But the process can be expanded by clicking on its disclosure triangle to reveal each individual Safari process that is running. An example: If you have multiple Safari pages open (and who doesn’t?), they will show up as a single “Safari” process. The Energy tab displays a hierarchical view of processes, with related processes displayed together. In those cases, the Energy tab can help us discover processes that are using a lot of energy and likely causing our Macs to heat up and run the internal fans, with an annoying high-speed whine. The Energy tab is also useful for those of us with desktop Macs, or who have our MacBooks plugged into the mains (AC). For those of us with MacBooks, the Energy section of Activity Monitor can help us manage the MacBook’s battery runtime by discovering which processes are using excessive amounts of the battery’s energy. The Energy tab measures the overall energy use of your Mac, as well as on a per process (app) basis. If you’re not familiar with how to use Activity Monitor, you may want to take a few moments to check out Using Activity Monitor Part 1: CPU and Memory. In Activity Monitor Part 1, we looked at the basics of using the app, and examined how to use the app to monitor CPU and RAM utilization.
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