January 2015
Intermediate to advanced
298 pages
6h 27m
English
Content preview from OpenJDK CookbookBecome 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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Using HotSpot dev parameters
HotSpot has other options, which may significantly change its behavior. Here we will make use of some of these options, which are used only on the dev versions of OpenJDK.
Getting ready
We will need to compile a dev OpenJDK version, in order to use the dev options.
How to do it...
We will use parameters that are available in the developer version of OpenJDK. In the production builds, they are disabled or set as constant values.
To make use of these parameters, we will run Java as follows:
java - -XX:<optionName>
Here is a list of some usable dev options:
InlineUnsafeOps: This option will, if enabled, inline native memory operations fromsun.misc.Unsafe. It may offer some performance improvements in some cases.DieOnSafepointTimeout ...
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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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