Category Archives: Sizing

Fewer Large (heap size) JVMs vs Several Smaller JVMs

In the world of J2EE applications and their associated architectures, there is frequently a debate about the number and heap size of the JVMs to be used. The performance and resource “sweet spot” is highly dependent on the application and … Continue reading →

Posted in J2EE, Java, Sizing, Tuning | 1 Comment

[CheapHA-HPC] A Different Slightly Approach To Grid Computing

I’ve been working with a customer that has a surprisingly common workload – document management & processing, as well as very common constraints – no development staff with parallel programming (MPI, etc) expertise, no time to build a completely new … Continue reading →

Posted in Cloud Computing, J2EE, Java, Linux, Sizing, Storage, Tuning, VMWare, [CheapHA-HPC] | Tagged , , | Comments Off

Erlang Units…

Per Wikipedia, an Erlang Unit is: “The erlang (symbol E[1]) as a dimensionless unit is used in telephony as a statistical measure of offered load. It is named after the Danish telephone engineer A. K. Erlang, the originator of traffic … Continue reading →

Posted in Models, Sizing, Tuning | Tagged , | Comments Off

[CheapHA-HPC] Part 1 – First Steps

This is part 1 in a multipart adventure into cost-efficient supercomputing and high availability. By now you’ve probably heard of Beowulf Linux clusters, HPC clusters made from PlayStations, the monsters listed at http://www.top500.org/, Amazon’s EC2/S3, and the like. Well, what … Continue reading →

Posted in J2EE, Java, Legacy, Linux, Models, Perl, Scripts, Sizing, Tuning, UNIX, [CheapHA-HPC] | 2 Comments

Mainframe Modernization And Migration Considerations

So… you have a mainframe application and you want to modernize it or migrate it to a distributed systems architecture… congratulations. Here are some things you may want to consider before making the foolish move of comparing MIPS to SPECint … Continue reading →

Posted in AIX, DB2, J2EE, Java, Legacy, Linux, Mainframe, Oracle, Sizing, UNIX | Tagged , | Comments Off