About the Authors

Brendan Gregg is a performance specialist at Joyent and is known worldwide in the field of DTrace. Brendan created and developed the DTraceToolkit and is the coauthor of Solaris Performance and Tools (McDougall, Mauro, and Gregg, 2006) as well as numerous articles about DTrace. He was previously the performance lead for the Sun/Oracle ZFS storage appliance and a software developer on the Fishworks advanced development team at Sun, where he worked with the three creators of DTrace. He has also worked as a system administrator, performance consultant, and instructor, and he has taught DTrace worldwide including workshops that he authored. His software achievements include creating the DTrace IP, TCP, and UDP providers; the DTrace JavaScript provider; and the ZFS L2ARC. Many of Brendan’s DTrace scripts are shipped by default in Mac OS X.

Jim Mauro is a senior software engineer for Oracle Corporation. Jim works in the Systems group, with a primary focus on systems performance. Jim’s work includes internal performance-related projects, as well as working with Oracle customers on diagnosing performance issues on production systems. Jim has 30 years of experience in the computer industry, including 19 years with Sun Microsystems prior to the acquisition by Oracle. Jim has used DTrace extensively for his performance work since it was first introduced in Solaris 10 and has taught Solaris performance analysis and DTrace for many years.

Jim coauthored the first and second editions of Solaris Internals (McDougall and Mauro, 2006) and Solaris Performance and Tools (McDougall, Mauro, and Gregg, 2006) and has written numerous articles and white papers on various aspects of Solaris performance and internals.