November 2015
Intermediate to advanced
200 pages
4h 26m
English
Content preview from Ruby Performance Optimization
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Measure with Ruby-Prof
ruby-prof is a Ruby gem that comes with both an API and a command-line tool. In most cases you’ll probably want use the API to profile just that isolated part of the code that you suspect to be slow. But the command-line tool is what you want for profiling application startup, especially if you’re interested in rubygems startup costs. In Rails applications you can get the complete request profile by inserting ruby-prof into the middleware stack.
1. ruby-prof API
In this example we’ll use the ruby-prof API to profile a specific part of your code.
| chp4/ruby_prof_example_api1.rb | |
| | require 'date' |
| | require 'rubygems' |
| | require 'ruby-prof' |
| | |
| | GC.disable |
| | |
| | RubyProf.start |
| | Date.parse("2014-07-01") |
| | result = RubyProf.stop ... |
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