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java Programming Glossary: contentionHow to choose the id generation strategy when using hibernate http://stackoverflow.com/questions/10041938/how-to-choose-the-id-generation-strategy-when-using-hibernate points. For example hilo strategy is expected to reduce contention. I am assuming there must be a trade off associated with this..
Why use a ReentrantLock if one can use synchronized(this)? http://stackoverflow.com/questions/11821801/why-use-a-reentrantlock-if-one-can-use-synchronizedthis an optional fairness parameter. When set true under contention locks favor granting access to the longest waiting thread. Otherwise.. also be more scalable performing much better under higher contention. You can read more about this here . This claim has been contested.. use it if you actually have a situation that exhibits high contention but remember that the vast majority of synchronized blocks hardly..
How is Java's ThreadLocal implemented under the hood? http://stackoverflow.com/questions/1202444/how-is-javas-threadlocal-implemented-under-the-hood reasonably well but does have some disadvantages. Thread contention ConcurrentHashMap is a pretty smart class but it ultimately.. is an improvement but still doesn't address the thread contention issue meaning so far our ThreadLocal isn't all that amazing..
Problem with synchronizing on String objects? http://stackoverflow.com/questions/133988/problem-with-synchronizing-on-string-objects same object. Note that this may introduce a new point of contention since deep in the VM intern may have to acquire a lock. I have.. that StaticCache still needs to be thread safe. But the contention there should be tiny compared with what you'd have if you were..
http://stackoverflow.com/questions/1625118/java-double-checked-locking unless you know you are going to get a ton of thread contention on getting this Singleton or you have profiled the application..
http://stackoverflow.com/questions/1898374/does-the-jvm-create-a-mutex-for-every-object-in-order-to-implement-the-synchron object is never locked or if it is locked but there is no contention it stays that way. If and when contention occurs on a locked.. but there is no contention it stays that way. If and when contention occurs on a locked object the JVM inflates the lock into a full..
Java Concurrency: CAS vs Locking http://stackoverflow.com/questions/2664172/java-concurrency-cas-vs-locking faster than locking but it does depend on the degree of contention. Because CAS may force a retry if the value changes between..
Difference between volatile and synchronized in JAVA (j2me) http://stackoverflow.com/questions/3519664/difference-between-volatile-and-synchronized-in-java-j2me overhead of full synchronization and it's attendant contention and cache flushing. Speaking to your read update write question..
http://stackoverflow.com/questions/4068562/how-heavy-are-java-monitors I'm wondering what's the case in Java. Given the chance of contention is low would the use of monitors impose more than the sheer.. this question You have already paid most of and in low contention the penalty for having the Monitors around by using Java..... Java... no sense not using them. Particularly in the low contention case they are very cheap see Items 2.1 2.2 2.3 here and Item..
Thread-safe iteration over a collection http://stackoverflow.com/questions/4517653/thread-safe-iteration-over-a-collection if this doesn't happen too often i.e. you won't have much contention for the collection . If you're doing a lot of work and don't..
What optimizations can I expect from Dalvik and the Android toolchain? http://stackoverflow.com/questions/4912695/what-optimizations-can-i-expect-from-dalvik-and-the-android-toolchain JIT as soon as possible with minimal impact to resource contention eg memory footprint CPU hijacked by the compiler thread so that..
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