Storage B

Linux User #310674

jac — Tue, 27 Sep 2011 01:26:58 +0000

6 Million Orders per Second on a Single Thread

jac — Sat, 23 Jul 2011 00:18:51 +0000

LMAX is a new retail financial trading platform. As a result it has to process many trades with low latency. The system is built on the JVM platform and centers on a Business Logic Processor that can handle 6 million orders per second on a single thread. The Business Logic Processor runs entirely in-memory using event sourcing. The Business Logic Processor is surrounded by Disruptors – a concurrency component that implements a network of queues that operate without needing locks. During the design process the team concluded that recent directions in high-performance concurrency models using queues are fundamentally at odds with modern CPU design.

The motivation for developing this technology was to facilitate betting on sporting events…

MSDN

jac — Thu, 21 Jul 2011 16:33:36 +0000

Here's my MSDN profile.

Standards

jac — Wed, 20 Jul 2011 16:50:44 +0000

Leninbert

jac — Fri, 24 Jun 2011 01:43:41 +0000

(via Tom the Dancing Bug)

Twitter Test

jac — Sat, 14 May 2011 20:47:09 +0000

Testing…

Something I used to do

jac — Wed, 11 May 2011 18:38:10 +0000

Actual screenshots of software I’ve had a hand in creating:

Feedback system – used in the operation of ship handling simulators

The above feedback system used in a classroom setting

Simulated ship controls and navigational aids

I supervised the installation of a ship handling simulator at the Indian Navy’s Navigation and Direction school in Kochi, India

Upgrades

jac — Fri, 11 Mar 2011 02:13:56 +0000

An Update is Available for Your Computer

OpenDDS 2.3

jac — Sat, 19 Feb 2011 23:37:01 +0000

(via OpenDDS)

(18 February 2011) We are pleased to announce the release of OpenDDS version 2.3

First release of the OpenDDS Modeling SDK, a modeling tool that can be used by the application developer to define the required middleware components and data structures as a UML model and then generate the code to implement the model using OpenDDS. The generated code can then be compiled and linked with the application to provide seamless middleware support to the application. UML models are manipulated using a graphical editor based on Eclipse. See the OpenDDS Developer’s Guide for installation instructions.

DCPSInfoRepo no longer requires an -ORBSvcConf argument when using Built-In Topics. The DCPSInfoRepo process will take care of loading SimpleTCP (if it’s not already loaded).

Fixed method signature of DataWriter::register_instance_w_timestamp() to have two arguments per the latest spec, not three.

“make install” is now available on platforms using GNU Make and when building with OCI TAO 1.6a or DOC Group TAO. Added support for Microsoft Visual Studio 2010 (vc10).

See the Release Notes for details.

Fortran vs. Algol

jac — Thu, 27 Jan 2011 16:51:31 +0000

I recently stumbled upon Google Trends. I though it might be interesting to compare the search volume for the first two computer languages I learned: Fortran vs. Algol

fortran algol

The results are not too surprising, since Fortran is still widely used by scientists and engineers. Algol, which, according to The Retrocomputing Museum, is “the common ancestor of C, Pascal, Algol-68, Modula, Ada, and most other conventional languages that aren’t BASIC, FORTRAN, or COBOL,” isn’t used as much anymore.