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1. #MAC TERMINAL FIND AND KILL PORT HOW TO#
2. #MAC TERMINAL FIND AND KILL PORT FOR MAC OS X#
3. #MAC TERMINAL FIND AND KILL PORT MAC OS X#
4. #MAC TERMINAL FIND AND KILL PORT PASSWORD#

Here’s an example: Brendan-2:~ brendan$ sudo iosnoopĥ03 67261 W 384070496 73728 TweetDeck ?/Cookies/ist_tmp_67261_0.datĥ03 67261 W 384070640 4096 TweetDeck ?/Local Store/td_26_brendangregg.db-journalĥ03 67261 W 308056800 4096 TweetDeck ?/Local Store/td_26_brendangregg.dbĥ03 67261 W 308056856 4096 TweetDeck ?/Local sudo says “permission denied”, check your admin status.Īnd here’s what happens if you forgot the “sudo”: Brendan-2:~ brendan$ iosnoopĭtrace: failed to initialize dtrace: DTrace requires additional privileges When a DTrace command is running, you usually type Ctrl-C to end it.

#MAC TERMINAL FIND AND KILL PORT PASSWORD#

You can run DTrace by prefixing your DTrace commands with “sudo”, which will prompt for the password the first time around (but not for some time after that).

#MAC TERMINAL FIND AND KILL PORT HOW TO#

Running DTraceĭTrace requires admin privileges, so to use it you’ll usually need to type in a password to authenticate, provided you have administrator access (if you aren’t sure you do, click here to see how to check). If firefox stayed that high you could look for the responsible tab and close it down, or restart Firefox.Īfter top, I turn to DTrace.

The top was “firefox-bin” (Mozilla Firefox) at 98.8% CPU, which is in terms of a single processor (this has two). The busiest (CPU) process will be at the top, since we sorted on cpu (“-o cpu”). Look at the “%CPU” column to see which processes are making the CPUs busy, and the “RSIZE” column to see who is consuming main memory. I’ve truncated the header block to just include the columns. The output will look something like this: Brendan-2:~ brendan$ top -o cpu Now that you have Terminal running, type “top -o cpu” and hit enter, which will refresh the screen showing top running processes. While DTrace can see everything, there are some things already covered by easy-to-use (and easy-to-type) tools, like top(1). For example, here’s my screen as I write this blog post (in a terminal-based text editor). Under the “Window” tab is the default size, 80×24, which you can also increase later by clicking and dragging the bottom right corner of the terminal. I use Monaco 13pt, with “Antialias Text” on. You can adjust the font to your liking in Terminal->Preferences->Text.

#MAC TERMINAL FIND AND KILL PORT MAC OS X#

(Why Unix? Mac OS X is Unix under the hood: the Darwin kernel). The size of the window in terms of characters is also small (80 columns by 24 rows), presumably to pay homage to original Unix terminals of that size. I find the default font small and hard to read. When you first run Terminal, it’ll probably look like this: I usually drag it to my Dock so it’s easy to find later: You can also type “terminal” in Spotlight (the magnifying glass in the top right corner of your Mac’s screen), which should find it. If you’ve never run a DTrace script before or even used the command line, here’s a basic walkthrough: Open Terminal

Most of these scripts are already installed, a few are from the new DTrace book. In this post, I’ll cover the top ten Mac OS X DTrace scripts that I use for figuring out why laptops are slow or why applications are misbehaving. DTrace, however, can see (just about) everything. Standard performance analysis tools like Activity Monitor and top(1) (and any third-party tools based on the same foundation) can’t tell you some key information about activity on your system, such as how much CPU consumption is caused by short-lived processes, or which processes are causing disk I/O. Applications can become slow or unresponsive while waiting for CPU work, memory requests or disk I/O to complete.įor people who try to ignore the slowdown, the question can become: I work in an office where everyone has MacBook Pros, and “why is my MacBook slow?” is a common question. I use them regularly to answer this question:

#MAC TERMINAL FIND AND KILL PORT FOR MAC OS X#

I’m familiar with the latter as I wrote the originals for the DTraceToolkit, which Apple then customized and enhanced for Mac OS X where they are shipped by default (great!). It provides data for Apple’s Instruments tool, as well as a collection of command line tools that are implemented as DTrace scripts. Since version 10.5 “Leopard”, Mac OS X has had DTrace, a tool used for performance analysis and troubleshooting.