By Brendan Gregg
The Oracle Solaris DTrace function revolutionizes how you debug working structures and purposes. utilizing DTrace, you could dynamically software software program and speedy solution almost 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 participants to the DTrace group, DTrace teaches through instance, proposing rankings of instructions and easy-to-adapt, downloadable D scripts. those concise examples generate solutions to actual and worthwhile questions, and function a kick off point for development extra advanced scripts. utilizing them, you can begin making sensible use of DTrace instantly, even if you are an administrator, developer, analyst, architect, or aid expert. The authors totally clarify the targets, recommendations, and output linked to each one script or command. Drawing on their large adventure, they supply approach feedback, checklists, and sensible diagrams, in addition to a bankruptcy of complicated assistance and tips. you are going to tips on how to Write powerful scripts utilizing DTrace's D language Use DTrace to completely comprehend process functionality reveal practical components of the working approach, together with I/O, filesystems, and protocols Use DTrace within the software and database improvement technique establish and fasten protection issues of DTrace study the working method kernel combine DTrace into resource code expand DTrace with different instruments This publication can assist you're making the main of DTrace to unravel difficulties extra speedy and successfully, and construct platforms that paintings speedier and extra reliably.
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Extra info for DTrace: Dynamic Tracing in Oracle Solaris, Mac OS X and FreeBSD (Oracle Solaris Series)
Studying the DTrace design and source code serves as a worldclass example of software engineering and computer science. Note that there is a minimum knowledge level assumed on the part of the reader for the topics covered, allowing this book to focus on the application of DTrace for those topics. com. All the scripts contained in the book, as well as reader feedback and comments, book errata, and subsequent material that didn’t make the publication deadline, can be downloaded from the site. Brendan Gregg’s DTraceToolkit is free to download and contains more than 200 scripts covering every everything from disks and networks to languages and the kernel.
15 ioctl:entry sysconfig:entry sysconfig:entry In the previous example code, the function field, which for the syscall provider is the name of the system call, is left blank in the probe name. DTrace will treat blank fields as wildcards and enable all probes matching the other fields defined in the DTrace invocation. In this example, the entry point of every system call was enabled. Because a probe clause was not specified, DTrace took the default action, which is to print the CPU ID of the CPU that executed the code (causing the probe to fire), the numeric ID of the probe, and the FUNCTION and NAME fields of the probe.
Table 1-2 is a glossary of key DTrace terms; there is also a full glossary toward the end of this book. 5. On FreeBSD, this probe was proc:::exec_success and is now being updated to proc::: exec-success. 6. The full argument list is not currently shown on Mac OS X and FreeBSD at the time of writing this book. ) Overview 9 Table 1-2 DTrace Terms Term Definition D language This is the defined set of terms, syntax, semantics, and functions for using DTrace. Note that using DTrace either from the command line or by running a script equates to the execution of a D program written in the D language.