Maccast Members 2011.03.26 - Activity Monitor
V Activity Monitor
V Provides a GUI for all the activity that is happening on your Mac.
* Processors
* Memory
* Disk Activity
* Disk Usage
* Network Activity
* You'll find it in Applications/Utilities
V The main window. Processes
* Can control which columns are displayed under the View-->Columns menu
V Can use the 'Show' drop down to filter view to:
* All processes
* Your processes
* System processes
* Other user processes
* Active and Inactive
* Windowed processes (basically apps)
V Process ID - An incrementing number of each process running on your machine
* This can be apps, utilities, daemons, or other background processes
* Sorting the column will let you see the first or latest processes
* Process Name
V User column
* Displays the user that launched the process
* Typically your user, root, or something like daemon, _www
* How much of the CPu an app is actively using.
* Seeing it spike to 100% or higher shouldn't be a concern, especially if the app is actively doing a task.
V Threads
* A sequence of instructions being performed by one application or process.
* If you see an app with lots of threads running, and it doesn't have a UI on screen it could be running background stuff
V Memory
* Real - Physical memory on the machine
* Virtual = "fake memory", swap disk.
V Other columns:
* CPU Time, # Ports, Private Memory, Shared Memory, Messages Sent, and Messages Received.
V Tabs along the bottom
* Can see what percentage of the processor is in use by User or System processes
* Also total threads and processes
V Memory
* Free Memory: RAM that's not being used.
* Wired: Can't be moved to disk. Stays in physical RAM
* Active: currently in memory, and has been recently used.
* Inactive: Memory is not actively being used, but was recently used.
V VM size has nothing to do with hard disk space or with the amount of ram being used.
* Is simply number of addresses allocated to a program. VM Size is the totally of the addresses allocated for all apps, so can exceed the size of your hard drive.
V Used: Total used
V Page Ins/Outs
* Memory moved between RAM and the hard disk.
* Generally want page outs to be low
V Swap Used
* Amount of information copied to the swap file on your hard drive.
* Again the lower the better
* If either are consistently high, get more RAM
* You can reboot to reset and then watch.
V Disk Activity
* Read and writes to the HD
* Throughput can be measured
* There is a graph
V Disk Usage
* Amount of HD in use or free.
* Can read internal and external drives
V Network
* Packets in and out and their throughput
* Total data sent and received and throughput
* May be useful in identifying background network activity
V Advanced stuff
V Inspect
* Like "Get Info" on a process
* Parent process that launched it.
* User
* Threads, PU time, Page Ins
* Memory details
* CPU info
V Show delta
* process will turn green in list
V Will monitor the changes in all the parameters between frequency updates
* Change sample frequency in View-->Update Frequency
* 0.5 sec, 1 sec, 2 sec, 5 sec.
V Quit Process - Kill a process.
* Application not responding
V Sometimes sending an Interrupt can "wake" a non-responsive process
V View-->Send Signal to process
* SIGKILL - Kill immediately
* SIGINT - Interrupt
* SIGHUP - Hang up
* SIGQUIT - Quit and dump core
V Live monitoring
V View-->Dock Icon
* CPU, Network, Disk, Memory
V Windows
* CPU Usage
* CPU History
* Of course also great 3rd party tools like iStat