Simon Kågström, PhD

BTH logoYesterday, I had the honor of being the opponent at the PhD defense of Simon Kågström at Blekinge Tekniska Högskola (BTH, Blekinge University of Technology in English). His PhD thesis deals mainly with the multiprocessor port of an industrial in-house operating system, and a secondary theme was the design of the Cibyl C-programs-to-JVM translator. All of his papers are very well-written and a joy to read, and the engineering work behind it is very solid.

The most important data in the PhD thesis is really just how much work it is to do an SMP port of an OS kernel. And how hard it is to get performance up to good levels even with several years of work. Really emphasizes the point that hard work and perseverance and just lots of calendar time is what it takes to create a good SMP OS. That’s why Solaris and AIX are still years ahead of Linux in this respect — you just need to hit the snags, fix them, retest, and hit the next snag. It takes time to polish, basically.

So, if you have any interest in multiprocessor operating systems, Simon’s work is well-worth a read. Also check out his blog at  And by the way, he did pass.

Simulation is Better than Barr & Massa Says

Cover of Programming Embedded Systems by Barr and MassaIn the book “Programming Embedded Systems — with C and GNU Development Tools“, authors Michael Barr and Anthony Massa make some statements on simulation that I just have to disagree with on principle. Read on for what. Note that overall this is a good book, I am not claiming that it is not. The Amazon reviews are pretty good, and having a foreword by Jack Ganssle is always a sign of quality. But I just have to correct them on one little fact…

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Book review: “Fruits of War”

A review of the book “Fruits of War” by Michael White. The book discusses how war has accelerated technological progress and provided unexpected benefits to society. The author is a bit defensive about not professing that war is good in any way, which is pretty obvious and does not really need to be an issue in reading the book. It is a fairly straight reporting of facts, rather than any attempt to editorialize or present radical opinions.
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Book Review: Intel’s Multicore Programming Book

Multicore programming book coverThe book “Multicore Programming – Increasing Performance through Software Multithreading” by Shameem Akhter and Jason Roberts is part of a series of books put out by Intel in their multicore software push. In case you have not noticed, Intel has a huge market push currently where they give seminars, publish articles and books, and give curricula to universities in order to get more parallel software in place. I read this book recently, and here is a short review.
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