EcoConception Logicielle

La détection des capacités navigateur (ou feature detection) est une façon d'optimiser son profilage côté serveur.

Website speed is important for usability. The free web-based/online tools featured in this collection allow you to evaluate web performance.

There are various techniques to improve the performance of your Java application. In this article I will talk about Statement Pooling Configuration and its effect on Garbage Collection process.

Statement Pooling allows to improve the performance of an application by caching SQL statements that are used repeatedly. Such caching mechanism allows to prepare frequently used statements only once and reuse them multiple times, thus reducing the overall number of times the database server has to parse, plan, and optimize these queries. A well-configured number of statements (maxStatements) to be cached can be as good as tuning the Garbage Collection. Now let's see how Statement Pooling can affect the Garbage Collection.

This is the second article in the series of "Become a Java GC Expert". In the first issue Understanding Java Garbage Collection we have learned about the processes for different GC algorithms, about how GC works, what Young and Old Generation is, what you should know about the 5 types of GC in the new JDK 7, and what the performance implications are for each of these GC types.

In this article, I will explain how JVM is actually running Garbage Collection in the real time.

This is the fifth article in the series of "Become a Java GC Expert". In the first issue Understanding Java Garbage Collection we have learned about the processes for different GC algorithms, about how GC works, what Young and Old Generation is, what you should know about the 5 types of GC in the new JDK 7, and what the performance implications are for each of these GC types.

In the second article How to Monitor Java Garbage Collection we have explained how JVM actually runs the Garbage Collection in the real time, how we can monitor GC, and which tools we can use to make this process faster and more effective.

In the third article How to Tune Java Garbage Collection we have shown some of the best options based on real cases as our examples that you can use for GC tuning. Also we have explained how to minimize the number of objects passed to Old Area, decreasing Full GC time, as well as how to set GC type and the memory size.

In the fourth article MaxClients in Apache and its effect on Tomcat during Full GC we have explained the importance of MaxClients parameter in Apache that significantly affects the overall system performance when GC occurs.

In this fifth article I will explain about the principles of Java application performance tuning. Specifically, I will explain what is required in order to tune the performance of Java application, the steps you need to perform to identify whether your application needs tuning. I will also explain the problems you may encounter during performance tuning. The article will be finalized with the recommendations you need to follow to make better decisions when tuning Java applications.

This is the third article in the series of "Become a Java GC Expert". In the first issue Understanding Java Garbage Collection we have learned about the processes for different GC algorithms, about how GC works, what Young and Old Generation is, what you should know about the 5 types of GC in the new JDK 7, and what the performance implications are for each of these GC types.

In the second article How to Monitor Java Garbage Collection I have explained how JVM actually runs the Garbage Collection in the real time, how we can monitor GC, and which tools we can use to make this process faster and more effective.

In this third article based on real cases as our examples I will show some of the best options you can use for GC tuning. I have written this article under the assumption that you have already understood the previous articles in this series. Therefore, for your further understanding, if you haven't already read the two previous articles, please do so before reading this one.

This is the first of a series of "Become a Java GC Expert" articles. I will cover the GC introduction this time, and in the next article, I will talk about analyzing GC status and GC tuning examples from NHN.

The purpose of this article is to introduce GC to you in an easy way. I hope this article proves to be very helpful. Actually, my colleagues have already published a few great articles on Java Internals which became quite popular on Twitter. You may refer to them as well.

Returning back to Garbage Collection, there is a term that you should know before learning about GC. The term is "stop-the-world." Stop-the-world will occur no matter which GC algorithm you choose. Stop-the-world means that the JVM is stopping the application from running to execute a GC. When stop-the-world occurs, every thread except for the threads needed for the GC will stop their tasks. The interrupted tasks will resume only after the GC task has completed. GC tuning often means reducing this stop-the-world time.