Home » Tag Archives: Performance and Scalability (page 3)

Tag Archives: Performance and Scalability

Java Secret: Loading and unloading static fields

OVERVIEW To start with it is natural to assume that static fields have a special life cycle and live for the life of the application. You could assume that they live is a special place in memory like the start of memory in C or in the perm gen with the class meta information. However, it may be surprising to ...

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Monitoring OpenJDK from the CLI

Currently I do quite a bit of work in and around the Java virtual machine (JVM), most of the time on Linux. When things go awry and I am trying to establish why, I reach for the Java performance analysis tools. These tools come in two forms, the wonderful GUI known as visualvm, which I use when I am working ...

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SQL or NOSQL: That is the question?

So what’s the deal with NoSQL? Is NoSQL just a controversial buzzword? Could you imagine if the term ‘Object Oriented’ didn’t exist and instead architectures based on concepts such as encapsulation, polymorphism and inheritance were referred to as ‘NoProcedural’? Could you imagine if .net was called ‘NoJava’? Leinster was called ‘NoMunster’? Well controversial name aside, a good way to appreciate ...

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C++ or Java, which is faster for high frequency trading?

Overview There are conflicting views as to what is the best solution for high frequency trading. Part of the problem is that what is high frequency trading varies more than you might expect, another part is what is meant by faster. My View If you have a typical Java programmer and typical C++ programmer, each with a few years experience ...

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How to get C like performance in Java

Overview Java has many areas which can be slow. However for every problem there is a solution. Many solutions/hacks require working around Java’s protections but if you need low level performance it is still possible. Java makes high level programming simpler and easier at the cost of making low level programming much harder. Fortunately most applications follow the rule of ...

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Java Secret: Using an enum to build a State machine

Overview The enum in Java is more powerful than many other languages which can lead to surprising uses. In this article, I outline some the individual features of enum in Java, and put them together to form a state machine. Enum for Singleton and Utility class You can use an enum as a Singleton or Utility very simply. enum Singleton ...

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Low GC in Java: Use primitives instead of wrappers

Overview There are two good reason to use primitives instead of wrappers where possible. Clarity. By using a primitive, you are making it clear that a null value is not appropriate. Performance. Using primitives is often much faster. Clarity is often more important than performance, and is the best reason to use them. However, this article discussed the performance implications ...

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Using FindBugs to produce substantially less buggy code

Some time ago a user of Java-monitor, the forum of our JCG partner, Kees Jan, spotted that his system was forcing a large number of full Garbage Collections despite the fact that the overall memory utilization was low. A rough estimation for the cause of the problem suggested a potential call to System.gc() performed by one of the libraries in ...

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