By Brendan Gregg
The Oracle Solaris DTrace characteristic revolutionizes how you debug working platforms and purposes. utilizing DTrace, you could dynamically device software program and fast resolution nearly any query approximately its habit. Now, for the 1st time, there is a accomplished, authoritative consultant to creating the main of DTrace in any supported UNIX environment--from Oracle Solaris to OpenSolaris, Mac OS X, and FreeBSD. Written through key members to the DTrace neighborhood, DTrace teaches through instance, featuring rankings of instructions and easy-to-adapt, downloadable D scripts. those concise examples generate solutions to genuine and priceless questions, and function a kick off point for development extra advanced scripts. utilizing them, you can begin making functional use of DTrace instantly, even if you are an administrator, developer, analyst, architect, or help specialist. The authors totally clarify the objectives, options, and output linked to each one script or command. Drawing on their large event, they supply approach feedback, checklists, and useful diagrams, in addition to a bankruptcy of complicated suggestions and methods. you will easy methods to Write potent scripts utilizing DTrace's D language Use DTrace to completely comprehend approach functionality divulge practical components of the working procedure, together with I/O, filesystems, and protocols Use DTrace within the software and database improvement approach determine and fasten safeguard issues of DTrace examine the working procedure kernel combine DTrace into resource code expand DTrace with different instruments This publication can assist you're making the main of DTrace to resolve difficulties extra speedy and successfully, and construct structures that paintings speedier and extra reliably.
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Extra resources for DTrace: Dynamic Tracing in Oracle Solaris, Mac OS X and FreeBSD (Oracle Solaris Series)
Thanks, mate; it’s been a heck of a ride. More than anything, this is your book. Thanks to my manager, Fraser Gardiner, for his patience and support. I want to thank the members of Fraser’s team who I have the opportunity to work with and learn from every day: Andy Bowers, Matt Finch, Calum Mackay, Tim Uglow, and Rick Weisner, all of whom rightfully belong in the “scary smart” category. Speaking of “scary smart,” a special thanks to my friend Jon Haslam for answering a constant stream of DTrace questions and for his amazing contributions to DTrace.
You can collect and aggregate data, take time stamps, collect stack traces, and so on. These choices will be explored extensively throughout this book. Once the desired actions have been taken, the code resumes executing normally: The software behaves just as if the probe were not present. Dynamically generated probes alter code only when they are in use; when disabled, their effect on performance is zero. Among the many benefits of DTrace’s innovative design are CPU and memory utilization—the framework makes minimal demand on CPU cycles and memory.
NULL/ tests that the string variable b contains data (not NULL). Operators All operators and order of precedence follow the ANSI-C conventions. Arithmetic operators are supported for integers only. They are + (addition), - (subtraction), * (multiplication), / (division), and % (modulus). The expression a = (b + c) * 2; will add b and c, then multiply by 2, and finally assign the result to a. = (not equal to), < (less than), <= (less than or equal to), > (greater than), and >= (greater than or equal to).
DTrace: Dynamic Tracing in Oracle Solaris, Mac OS X and FreeBSD (Oracle Solaris Series) by Brendan Gregg