September 2011
Intermediate to advanced
528 pages
19h 57m
English
Content preview from Oracle WebLogic Server 11g Administration Handbook Become 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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Understanding Locking
The JVM uses two types of locks—thin locks that are helpful for brief periods and fat locks that are held when there's contention for resources. Threads sleep during a fat lock and spin during a think lock, thus making fat locks less resource intensive because spinning uses up CPU cycles. You can use the command -Xverbose:locks to view information about the JVM locks. You can enable locking instrumentation by using the following command:
-XX:UseLockProfiling=true
The preceding command shows details about the number and types of locks held by the JVM. You can enable the collection of locking information by the JRockit Runtime Analyzer using the following option at startup time:
-Djrockit.lockprofiling=true
Using Lock ...
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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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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.