Posted by Jeroen Borgers at around evening time: June 15th, 2009
Last week I blogged about setting your performance goals: defining your requirements. This time I’ll blog about the importance of a Proof of Concept for performance.
The IT world is very sensitive to trends. Having been around in the IT industry for 15 years, I’ve seen a few. A technology is hot for a while, and then quickly becomes out-of-fashion and yesterdays news. It will be replaced by something which is much better and what everyone follows almost blindly.
(more…)
Posted by Vincent Partington around lunchtime: June 13th, 2009
Last week my colleague Albert Sikkema blogged about using UUIDs as primary keys. Interesting stuff, thanks again, Albert! This week I will continue the JPA implementation patterns series by discussing the relative merits of field access vs. property access.
The JPA specification allows two ways for the persistence provider to access the persistent state of an entity. The persistence provider can either invoke JavaBeans style property accessors (getters and setters) or access the instance fields of the entity directly. Which method is used depends on whether you have annotated the properties or the fields of an entity.
(more…)
Posted by Jeroen Borgers at around evening time: June 10th, 2009
Last week I blogged about how performance problems manifest themselves: frustration, loss of revenue and disruption of development; and how adding hardware is a questionable solution. This week I’ll blog about the first step to assure web performance.
It can be a valid choice to run the risk of performance problems in production and deal with them in a re-active manner. However, it is usually wiser to be pro-active and prevent them. This approach brings more certainty, peace of mind and also saves money. It consists of seven steps. Step 1: Define performance requirements.
(more…)
Posted by Jeroen Borgers at around evening time: June 2nd, 2009
Last week I blogged about the increasing load at web shops and the increasing challenges for developers and operators. The question to be answered was stated as: how can we prevent performance and availability problems; how can we assure that a web site is always quick and available? In this blog I’ll describe some of the forms in which I found performance difficulties to present themselves. (more…)
Posted by Jeroen Borgers at around evening time: May 25th, 2009
By Jeroen Borgers
More and more Internet users buy in web shops these days. Research shows that the part of European Internet users that buys on-line has grown from 40% in 2004 to 80% in 2008. Additionally, large web retailers in The Netherlands see their revenue grow just as if the recession has never materialized. Business seems to be flourishing. (more…)
Posted by Vincent Partington in the early evening: March 16th, 2009
Last week we started our search for JPA implementation patterns with the Data Access Object pattern. This week we continue with another hairy subject.
JPA offers the @OneToMany, @ManyToOne, @OneToOne, and @ManyToMany annotations to map associations between objects. While EJB 2.x offered container managed relationships to manage these associations, and especially to keep bidirectional associations in sync, JPA leaves more up to the developer.
(more…)
Posted by Guido Schoonheim around lunchtime: March 13th, 2009
Yesterday was a very good day! After speaking at QCon the day ended with CloudCamp. An evening dedicated to everything cloud with an amazing turnout! More then 500 folks joined.
Turns out that although in general people tend to agree what a cloud is, nobody actually knows exactly what to do with it! (more…)
Posted by Jeroen Borgers in the late evening: February 18th, 2009
By Jeroen Borgers
Last week I instructed an in-house performance tuning course and explained the participants about the threading optimizations in the Java 6 VM. We run the exercises of the course on Java 6 update 11 and when I told them that Escape Analysis did not work properly yet, I realized I did not really know this for a fact for this update of Sun’s Java. So, it is time to re-run the benchmark and find some unexpected results. (more…)
Posted by Sander Hautvast at around evening time: February 10th, 2009
A colleague asked me whether jconsole could connect to a running IBM Webpshere 6.1 instance. This way you could gather performance data and work with Mbeans like with any other 1.5+ JVM. I had never tried this, but I quickly saw that jconsole is provided with the websphere jvm, so I said I would give it a try.
The forum posts all complained that it wasn´t possible, but I combining several entries I got together a working solution. This is typical of websphere, it´s a little harder, but in the end you can get there.
(more…)
Posted by Vincent Partington just before lunchtime: December 13th, 2008
VMWare Server 2.0 was released about two months ago. Virtualization is hot and has a lot of different uses. I use it to run the Linux-based middleware products (Apache, IBM WebSphere Server, IBM WebSphere Portal, etc.) for which we are building an automated deployment product on my . But more about that later…
Anyway, I’ve been running betas and release candidates of VMWare Server 2.0 for six months now and while the functionality is great, initially the performance was very bad on my Thinkpad T61p running Windows Vista. Last week I finally got it to work with proper performance. A perfect time to let other people know how. 