![]() While the trace is running, reproduce the issue you are troubleshooting. Your Instruments set will start monitoring all file open operations and CPU usage for all processes. See "dtrace_all.zip" in attachments section at bottom of article. Before proceeding, you can choose "Save as Template." from the File menu, to save this for later use.Choose from the dropdown menu as shown below to attach your instrument to the target of our investigation: All Processes.Normally, we will not add any conditions, and log all activity.Ĭlick "Save" in the custom instrument dialog when you are done. If desired, you can also click the plus (+) button to the right of "System Call/open*" and add further logging conditions.įor example, you could add Executable="navx" to log only those file activities related to the navx process. See image below for these highlighted items. Click the plus (+) button to the right of "arg0/path", to add another data item to record: executable name. For our purposes, choose "System Call", "open*", "arg0", and "path". Next, we want to add an instrument that will monitor file "open" operations: Choose "Build New Instrument" from the Instrument menu.ĭon't be intimidated by the choices that appear. "Activity Monitor" will start you with a template that monitors CPU usage for all processes.To begin your own template, select "File System" from the Mac OS X list, then choose "Activity Monitor".Or,the following steps and images will tell you how this template is constructed, and give you ideas on how it can be customized. You can start right away by choosing "Open an Existing File." and using the pre-constructed template available in "dtrace_all.zip" - see attachments section at bottom of this article. When Instruments first starts, you must make a template choice. Instruments will be installed to your system drive, in /Developer/Applications/ - run it from there, or from the Xcode application menu item select Open Developer Tool->Instruments (in newer versions of Xcode).This procedure can easily be adjusted to trace only specific processes and executables, but for our purposes here you will be shown how to monitor CPU and file activity for all processes. ![]() Please use the most up to date version of Xcode for your environment to ensure compatibility. Please note: Xcode is a very large download and depending on network speeds may take some time to fully download. Double-click "Xcode.mpkg" and choose the default install. On older versions of Mac OS X distributed on physical media, Xcode will be located in the "Optional Installs" folder to install from.The Apple Developer site ( - requires registration of a developer account).The Mac App store (in Mac OS X 10.6.8 and later - requires registration with the App Store).Xcode is free and can be obtained via the following means: To install Instruments, you must install Xcode, the Macintosh development tools. Use the fs_usage command line to trace SymDaemon file activity instead. Also, the newer SEP client for Macintosh (as of SEP 12.1 RU4) and SymDaemon process are not visible to Instruments tracing. NOTE: Instruments and the required Xcode installation can be unwieldy. It can log and provide statistics for many application and kernel-level operations. ![]() DTrace is a troubleshooting tool available on several Unix-like operating systems, including Mac OS X. If you see inaccuracies in our content, please report the mistake via this form."Instruments" is an application provided by Apple that provides a graphical user interface for the DTrace command-line tool. ![]() If we have made an error or published misleading information, we will correct or clarify the article. Our editors thoroughly review and fact-check every article to ensure that our content meets the highest standards. Our goal is to deliver the most accurate information and the most knowledgeable advice possible in order to help you make smarter buying decisions on tech gear and a wide array of products and services. ZDNET's editorial team writes on behalf of you, our reader. Indeed, we follow strict guidelines that ensure our editorial content is never influenced by advertisers. Neither ZDNET nor the author are compensated for these independent reviews. This helps support our work, but does not affect what we cover or how, and it does not affect the price you pay. When you click through from our site to a retailer and buy a product or service, we may earn affiliate commissions. And we pore over customer reviews to find out what matters to real people who already own and use the products and services we’re assessing. We gather data from the best available sources, including vendor and retailer listings as well as other relevant and independent reviews sites. ZDNET's recommendations are based on many hours of testing, research, and comparison shopping.
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