"Pleiades, one of the world's most powerful supercomputers, represents NASA's state-of-the-art technology for meeting the agency's supercomputing requirements, enabling NASA scientists and engineers to conduct modeling and simulation for NASA missions. Powered by Lustre, this distributed-memory SGI ICE cluster is connected with InfiniBand in a dual-plane hypercube technology."The post Video: Defending the Planet with Lustre appeared first on insideHPC.

Comments

In this video from LUG 2015 in Denver, Robert Triendl from DDN presents: Application-optimized Lustre Solutions for Big-Data Workflows.The post Video: Application-optimized Lustre Solutions for Big-Data Workflows appeared first on insideHPC.

Comments

The original Mark I trains still sound the same but the areas around the station have developed greatly.

This is a sequel to my 2009 post about division of long integers. I am occasionally asked why this code produces a bizarre error message: Console.WriteLine(Math.Round(i / 6000000000, 5)); Where i is an integer. The error is: The call is … Continue reading →

As I’ve mentioned before, I’m part of the technical group looking at updating the ECMA-334 C# standard to reflect the C# 5 Microsoft specification. I recently made a suggestion that I thought would be uncontroversial, but which caused some discussion – and prompted this “request for comment” post, effectively. What does the standard say about … Continue reading Precedence: ordering or grouping? →

Comments

Comments

Nobody wants to use RC4. This well known stream cipher would have been retired long time ago if it weren’t for several critical problems in SSL and TLS, problems that affect block ciphers only–for example, BEAST, Lucky 13, and POODLE. So RC4 ended up being the lesser evil. Take BEAST, for example. There are mitigations […]

Comments

Occasionally I’m asked to review code that has a lot of repetition in it. Like, for instance, someone is writing a function memoizer: static Func<A, R> Memoize<A, R>(this Func<A, R> function) { var cache = new Dictionary<A, R>(); return argument … Continue reading →

Comments

Smashes, SMASHES! into that poor little car. :( Alternative title could have been: Driver weaves around car sitting in the left turn lane, ignores the red light, tries to turn left from center lane, ignores train signal, inevitable happens.

A common problem I see in object-oriented design is: A wizard is a kind of player. A warrior is a kind of player. A staff is a kind of weapon. A sword is a kind of weapon. A player has … Continue reading →

Yesterday (27 April), we released a new version of SSL Labs. In this blog post I’d like to quickly go over what was changed: there were a healthy number of improvements, a few fixes, and a large number of additions to the API. New features and assessment improvements: Added checks for Certificate Transparency in certificate, […]

Comments

In this series we’re exploring the problem “a player can use a weapon, a wizard is a kind of player, a staff is a kind of weapon, but a wizard can only use a staff”. The best solution we’ve come … Continue reading →

Comments

So let’s digress for a few episodes here. We’ll temporarily leave aside the problem of how we can have both a Player that has a Weapon and a Wizard that has a Staff. (Or Dagger.) Supposing that we can figure … Continue reading →

There are many, many questions on Stack Overflow about both parsing and formatting date/time values. (I use the term “date/time” to mean pretty much “any type of chronlogical information” – dates, times of day, instants in time etc.) Given how often the same kinds of mistakes are made, I thought it would be handy to … Continue reading Common mistakes in date/time formatting and parsing →

Comments

Comments

Last time we saw that in order to decide what code to call based on the runtime type of one argument — single dispatch — we could use virtual dispatch. And we saw that we could use the inaptly-named Visitor … Continue reading →

Emerald Express (EmX) is a popular and growing BRT system in Eugene OR.

Comments

Comments

Comments

Comments

Comments

Comments

Finalizers are interesting and dangerous because they are an environment in which everything you know is wrong. I’ve written a lot about the perils of C# finalizers / destructors (either name is fine) over the years, but it’s scattered in … Continue reading →

Comments

Yesterday we released SSL Labs 1.17.10, whose main goal was to introduce grading adjustments we had talked about a month ago. We delivered the planned changes as well as a few additional tweaks. Our release coincided with an announcement of a new attack against TLS, called Logjam, and we had some time to work on […]

Now that we’ve looked at a bunch of myths about when finalizers are required to run, let’s consider when they are required to not run: Myth: Keeping a reference to an object in a variable prevents the finalizer from running … Continue reading →

Earlier this week we released SSL Labs 1.17.10, whose main purpose was to increase the penalty when RC4 is used with modern protocols (i.e., TLS 1.1 and TLS 1.2). We had announced this change some time ago, and then put in place on May 20. The same release introduced another change, which was to increase […]

Comments

Comments

I briefly discussed copy-paste errors in code earlier; though this is a rich area of defects that I will probably at some point go into more detail on, that’s not for today. Though this is a trivial little issue, I … Continue reading →

Comments

Comments

Comments

As a reminder, we invite you to join us for our next STB Meetup TONIGHT from 5:30-7:30pm at the Impact Hub in Pioneer Square. Metro planners Ted Day and Jeremy Fichter will join us to discuss the U-Link restructure, with a brief presentation beginning at 5:30 and plenty of time for open Q&A thereafter. At roughly […]

Comments

The Cambridge Guided Busway is the world’s longest with 16 miles of guided sections. The guidance allows buses to run on a very narrow right of way (typical of many former railroad lines). It’s greener due to the vegetation that grows between the grooved concrete slabs which contain the wheels of the bus. Running the buses on […]

Comments

Comments

Comments

At the moment, I’m spending a fair amount of time thinking about a new version of the C# API and codegen for Protocol Buffers, as well as other APIs for interacting with Google services. While that’s the context for this post, I want to make it very clear that this is still a personal post, … Continue reading Backwards compatibility is (still) hard →

Comments