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10.5: Exploring OS X with dtrace 12 comments Create New Account
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Video Showing how to run the Trace Route on Mac OS? Detailed instructions - https://www.pcrisk.com/computer-technician-blog/mac/12296-how-to-perform-a-trace. Archive for the ‘Mac OS X’ Category ZFS: Apple’s New Filesystem That Wasn’t. Prologue (2006) I attended my first WWDC in 2006 to participate in Apple’s launch of their DTrace port to the next version of Mac OS X (Leopard). Apple completed all but the fiddliest finishing touches without help from the DTrace team. CleanMyMac X is a really useful Mac performance improvement app. It is an easy-to-use app that includes a whole load of features that improve how a Mac runs, including its network and browser connections, so you can be sure that it is running as smoothly as possible. Did you enjoy this post? Share it or subscribe to our newsletter.

Well, yeah, we're all about geeky.
We typically don't put our print articles on-line this quickly, but I'm thrilled that we were able to do so for such a milestone release of OS X. dtrace is just one of the many new things under the hood in Leopard. This article is just a sample of what we do every month.
For those of you that miss ktrace, pop open Terminal and check out dtruss, a ktrace-like replacement built on dtrace.
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Ed Marczak, Executive Editor, MacTech Magazine
http://www.mactech.com

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erm

lsof - LiSt Open Files is another great way to do this same thing.
http://en.wikipedia.org/wiki/Lsof

No, they're subtly different.
lsof will take a 'snapshot' and give you a one-time view of all file handles (and this includes things like TCP ports) that are open at the instant the program was run.
using dtrace, you will see file system activity in realtime - it's more similar to:
sudo fs_usage grep -i open
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k:.

Sorta. Not really. lsof is wonderful, but it prints a static dump of what's happening on the system right now. The dtrace example given above will print every file as it's opened. You can leave it running in a terminal, and spy on your system.
A much more complex example, one that's basically impossible with other tracing tools, is e.g. to print out details of all filesystem changes that happen within 100ms of a network connection being established. I've used this in production to figure out where a commercial product was stuffing connection data on disk.
(My day job is administering Solaris systems, FWIW)
ericb

dtrace is really cool. Apple even put a few utility dtrace scripts into /usr/bin.
For those of us who are missing ktrace (I am), there's dtruss. There's dapptrace which traces user and library functions an application calls (but doesn't work for me), and dappprof for profiling user and library code. Also, there's diskhits, which outputs the times and locations a file was actually read and written on the disk (doesn't count cache misses).
I think that's pretty awesome - replacing 4-ish utilities with one that's sufficiently extensible. (-:
These utilities (dtruss, dapptrace, dappprofile, diskhits) come with man pages; check them out with 'man utility-name' on the terminal.

...several, actually. There are a /lot/ more utilities packaged, I listed only the ones that I discovered in the last few days. To discover more, it helps to know that these utilities have man pages and these have 'DTrace' in their summary line:
the command 'man -k dtrace' on the Terminal will display these man pages together with their summary.

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No need for hard work doing manual script creation - there's a host of 'DTrace OneLiners' already included in Leopard (probably need XCode Tools installed). will list them To list file opens, for example or

Nice geek hint, but why not mention that Apple is also shipping a GUI tool to work with all of this?
The app is called 'Instruments':
/Developer/Applications/Instruments
Now, THAT is a cool toy!
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/Marook

Well, one used to be able to run ktrace/kdump to analyze one's own processes. But all of these dtrace tools appear to require superuser privileges -- which is incredibly annoying and even prohibitive in some situations. For the dtruss script in particular, does anyone know of a way to run this as a normal user?
The man pages mention something about setting the dtrace_kernel, dtrace_user or dtrace_proc privileges. But I can find no mention of how to set such beasts. Sun's pages (the origin of dtrace) mention the ppriv and usermod commands -- but those don't appear to be around.
What happened to deprecating a command over one major release before removing it? Thanks a lot, Apple.

For the dtruss script in particular, does anyone know of a way to run this as a normal user?
sudo chmod u+s /usr/sbin/dtrace

will allow dtruss to work as an ordinary user. It also makes dtrace suid root which means any user on the system can run dtrace with full privileges.

For the dtruss script in particular, does anyone know of a way to run this as a normal user?

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sudo chmod u+s /usr/sbin/dtrace

will allow dtruss to work as an ordinary user. It also makes dtrace suid root which means any user on the system can run dtrace with full privileges.

HOLY MOTHER OF PWN BATMAN!
$ file /usr/bin/dtruss
/usr/bin/dtruss: Bourne shell script text executable
Don't EVER make a shell script suid root.

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