Tenderlove Making - Profiling Rails startup with DTrace
TL;DR: I’m adding DTrace probes to Ruby, and I used those to make a 6% performance improvement to rake environment. ruby*:::function-entry { printf("-> %s::%s (%s:%d)\n", copyinstr(arg0), copyinstr(arg1), copyinstr(arg2), arg3); } $ sudo dtrace -q -s calls.d -c'rake environment' -> Module::local_constant_names (/Users/aaron/git/rails/activesupport/lib/active_support/core_ext/module/introspection.r
wiki . retrospectiva
Welcome to Joyent’s DTrace site What is DTrace? From sun.com’s BigAdmin : “DTrace is a comprehensive dynamic tracing framework for the Solaris Operating Environment. DTrace provides a powerful infrastructure to permit administrators, developers, and service personnel to concisely answer arbitrary questions about the behavior of the operating system and user programs.” What is the point of this sit
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