November 2015
Intermediate to advanced
200 pages
4h 26m
English
Content preview from Ruby Performance OptimizationBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Understand Why GC in Ruby 2.1 and 2.2 Is So Much Faster
In this book we repeatedly observed that new Ruby versions consistently perform better because the GC is faster. But why is it faster?
The first reason it’s faster is that less GC is needed. We have just seen that with our memory allocation example. The second reason is that each individual GC run can take less time.
Ruby implements GC using a simple two-phase mark and sweep (M&S) algorithm. In the mark phase it finds all living objects on the Ruby heap and marks them as live. In the sweep phase it collects unmarked objects.
Naturally, GC can’t allow you to allocate new objects while it marks. So your program pauses for the duration of GC.
Ruby 2.1 with RGenGC reduces the number ...
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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.
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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.