Last week, I posted a discussion about fault injection in virtual systems, using Basil Fawlty as the perfect example of a fault injection agent.
Category Archives: Wind River Blog
I have a post at my Wind River blog, about the difference between virtual and physical systems. The key idea is this:
Comparing virtual and physical systems is like comparing apples and apples, not apples and oranges: while apples are mostly interchangeable, they is certainly variation between them. Some apples are best for eating, some are better for making sauce, some are pie material, and some are best for fermenting cider. The type you select depends on what you want to cook. The difference between physical and virtual hardware is similar: they can be used as replacements for each other to some extent, but the connoisseur can make much better use of both by looking at the differences.
Go there now and read i!
I have a new post at my Wind River blog, about variability and determinism and how these two concepts interact. In short, even a deterministic simulator can expose great variability in a software workload and target system behavior.
I have a paper about “Transporting Bugs with Checkpoints” to be presented at the S4D (System, Software, SoC and Silicon Debug) conference in Southampton, UK, on September 15 and 16, 2010. The core concept presented is to leverage Simics checkpointing to capture and move a bug from the bug reporter to the responsible developer. It is a fairly simple idea, but getting it to work efficiently does require that some things are done right. See the longer Wind River blog posting about this topic for a few more details.
Past Friday, I posted a new blog post in my Wind River blog. It is an interview the PhD student Girish Venkatasubramanian from the University of Florida. He is doing research on virtual machines/hypervisors and how they can be implemented more efficiently by making fairly small changes to the architecture of memory management units.
I have a blog post called “When is Scripting Really Programming” up at the Wind River blog network. In that post, I discuss how scripting is really not clearly separated from “real programming” in the way I once believed it was… today, the line between higher-level programming languages and scripting languages look very thin in many cases. I illustrate with examples from Simics and its CLI and Python scripting systems.
I have another blog up at Wind River. This one is about multicore bugs that cannot happen on multithreaded systems, and is called True Concurrency is Truly Different (Again). It bounces from a recent interesting Windows security flaw into how Simics works with multicore systems.
One of the many nice effects of the Wind River acquisition of Simics is that I will be blogging as part of the Wind River Blog network. My first post there is up now, and it is a short (at least compared to a textbook, I admit it looks terribly long for a blog post) overview of how Simics works inside.
I think it is important for users of technologically advanced tools to know a bit of how they work. A classic example of this is compilers, where I taught an ESC class almost a decade ago which is my most popular piece of writing to date…