Created the USE method and USE method checklist for OS X.These were ported and enhanced by Apple engineering (thanks!).Procsystime, bitesize.d, seeksize.d, setuids.d, etc.

Wrote many DTrace scripts included with OS X.Įg: dtruss, iosnoop, iotop, opensnoop, execsnoop,.May change how you think about performance!.Covering not just current tools, but suggestions for future work.Many application issues can be found easily this way.From the systems perspective, not the application.Summarizes casual to serious performance analysis of OS X.This talk will make you aware of many areas of OS X that you can investigate, which will be especially useful for the time when you need to get to the bottom of a performance issue.Īnalyzing OS X Systems Performance with the USE Methodīrendan Gregg, Senior Performance Architect, Netﬂixĭarwin Operating System HardwareXNUKernel This is a tour of the tools needed to solve our performance needs, rather than understanding tools just because they exist. These areas are investigated by a wide variety of tools, including vm_stat, iostat, netstat, top, latency, the DTrace scripts in /usr/bin (which were written by Brendan), custom DTrace scripts, Instruments, and more. The focus is resources: CPUs, GPUs, memory capacity, network interfaces, storage devices, controllers, interconnects, as well as some software resources such as mutex locks. This methodology can be used by beginners and experts alike, and begins by constructing a checklist of the questions we’d like to ask of the system, before reaching for tools to answer them. This talk is about systems performance on OS X, and introduces the USE Method to check for common performance bottlenecks and errors.

Use dig for osx