November 2001
Intermediate to advanced
218 pages
6h 22m
English
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Profiler
In most cases, you
can improve the performance of a slow program by removing the
bottleneck. The profiler is a tool that finds
the bottleneck. In order to add profiling to your Ruby program, you
need to first load the Profile library using the
command-line option -r profile.
Here is the sample output from profiled execution. You can tell
Object#fact method is a bottleneck.
% ruby -r profile sample/fact.rb 100 9332621544394415268169923885626670049071596826438162146859296389521759999 3229915608941463976156518286253697920827223758251185210916864000000000000 000000000000 % cumulative self self total time seconds seconds calls ms/call ms/call name 66.67 0.07 0.07 1 66.67 66.67 Object#fact 16.67 0.08 0.02 1 16.67 16.67 Bignum#to_s 0.00 0.08 0.00 5 0.00 0.00 Fixnum#* 0.00 0.08 0.00 2 0.00 8.33 IO#write 0.00 0.08 0.00 1 0.00 0.00 Fixnum#== 0.00 0.08 0.00 95 0.00 0.00 Bignum#* 0.00 0.08 0.00 1 0.00 0.00 Module#method_added 0.00 0.08 0.00 101 0.00 0.00 Fixnum#> 0.00 0.08 0.00 1 0.00 16.67 Kernel.print 0.00 0.08 0.00 1 0.00 0.00 String#to_i 0.00 0.08 0.00 1 0.00 0.00 Array#[] 0.00 0.08 0.00 100 0.00 0.00 Fixnum#- 0.00 0.08 0.00 1 0.00 100.00 #toplevel
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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.Julian F.
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.Addison B.
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.Amir M.
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.