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When I asked for tools to profile Rails apps, someone pointed at DTrace. Since I work on MacOSX stations and deploy on OpenSolaris, it is a valid way to go. But I have little knowledge of DTrace.
Besides the usual suspect, Sun DTrace page and the avaliable info there, is there any other killer pointer to learn Dtrace out there?
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DTrace helps you understand a software system by enabling you to dynamically modify the operating system kernel and user processes to record additional data that you specify at locations of interest, called probes.
DTrace allows developers to embed static probe points in application code, including both complete applications and shared libraries. These probes can be enabled wherever the application or library is running, either in development or in production.
As a kind of post-modern advanced debugging technology, dynamic tracing allows software engineers to answer some tricky problems about software systems, such as high CPU or memory usage, high disk usage, long latency, or program crashes.
I did a 35 min video and showed some DTrace starter examples that you can find here: http://cocoasamurai.blogspot.com/2008/05/dtrace-for-cocoa-developers.html which were intended for introducing DTrace to Cocoa Developers, but it can work for anybody really
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