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This Blog Has Moved!

Right, so yes, five years ago I moved to github pages, and never bothered to redirect any of these pages there. Now I've moved on from there, and... Finally I am using my real domain, trishagee.com . My blog is now at trishagee.com/blog .  See you there!
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On The Evil Of Stereotypes

I attended (one way or another) two events last week that got me thinking The first was  Girl Developers will Save the World  - a session that had me a little confused as to whether that referred to me, or  actual  girls, i.e. those that are not yet legally classed as adults.  The second was the  Remarkable Women Twitter  party the following day. Firstly, a caveat/disclaimer (as usual) - both events were useful, thought-provoking and overall worthwhile.  But the alarming thing to me was the number of times I heard "boys are…" or "women think…" or "girls prefer…".  And I know we often make generalisations to stress a point, but I'm becoming extremely wary of statements that group people together along some arbitrary boundaries.   "Google+ failed because it's design by men for men" - no, it's because it's not designed for anyone.  Its only purpose was to compete with Facebook. "Women are better at communicating an...
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Overheard: Development Myths

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Continuing the theme of Things I Have Heard I Don't Think I Agree With. To developers technologies are everything I can't remember the context of this but I hear the same sentiment in different guises over and over again.  Often from non-techies, but more alarmingly from developers. Is this true? It's true for a certain tribe of techies, sure.  And creating and effectively using new technologies is an important part of what drives the current information age forward.  But I'd be worried if I thought that 99% of developers were like this. In our day jobs, and also if we want to create something that makes any money, we need to be interested in solving people's problems and creating solutions.  Sure, we'll use technology to do that.  But if we were all only motivated by technology, we'd always be trying out the Next Big Thing when our customers wanted a simple CRUD web app.  Any organisation that encouraged this sort of technology um, infidelity? ...
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On Changing The Image Of Programmers

Gah!! This is exactly what I was talking about  - it's pink, it mentions shoes, and it's about as patronising as you can get. Would the chart be different if your possible outcomes were  Bill Gates ,  Steve Jobs ,  Mark Zuckerberg , and  Linus Torvalds ?  I bet for a start it wouldn't mention Jimmy Choos or choice of handbags.  And it probably wouldn't be in baby blue either. Which leads me nicely onto the next subject I have strong opinions on: Role models.  Why do we need them?  Do  we need them? If there is any good to be salvaged from that horrific infographic, it's that it gave me what I've been trying to research - some female role models in technology. Unfortunately it hit the other button I was ranting about earlier - they're all very presentable and polished.  I don't doubt their value as role models, it's great to have people like that to try and emulate.  But surely there must be IT...
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Dissecting the Disruptor: What's so special about a ring buffer?

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Recently we open sourced the LMAX Disruptor , the key to what makes our exchange so fast.  Why did we open source it?  Well, we've realised that conventional wisdom around high performance programming is... a bit wrong. We've come up with a better, faster way to share data between threads, and it would be selfish not to share it with the world.  Plus it makes us look dead clever. On the site you can download a technical article explaining what the Disruptor is and why it's so clever and fast.  I even get a writing credit on it, which is gratifying when all I really did is insert commas and re-phrase sentences I didn't understand. However I find the whole thing a bit much to digest all at once, so I'm going to explain it in smaller pieces, as suits my  NADD audience. First up - the ring buffer.  Initially I was under the impression the Disruptor was just the ring buffer.  But I've come to realise that while this data structure is at the hea...
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Dissecting the Disruptor: Writing to the ring buffer

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This is the missing piece in the end-to-end view of the Disruptor.  Brace yourselves, it's quite long.  But I decided to keep it in a single blog so you could have the context in one place. The important areas are: not wrapping the ring; informing the consumers; batching for producers; and how multiple producers work. ProducerBarriers The Disruptor code has interfaces and helper classes for the Consumer s, but there's no interface for your producer, the thing that writes to the ring buffer.  That's because nothing else needs to access your producer, only you need to know about it.  However, like the consuming side, a ProducerBarrier is created by the ring buffer and your producer will use this to write to it. Writing to the ring buffer involves a two-phase commit.  First, your producer has to claim the next slot on the buffer.  Then, when the producer has finished writing to the slot, it will call commit on the ProducerBarrier . So let's look at...
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Dissecting the Disruptor: Demystifying Memory Barriers

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My recent slow-down in posting is because I've been trying to write a post explaining memory barriers and their applicability in the Disruptor . The problem is, no matter how much I read and no matter how many times I ask the ever-patient Martin and Mike questions trying to clarify some point, I just don't intuitively grasp the subject. I guess I don't have the deep background knowledge required to fully understand. So, rather than make an idiot of myself trying to explain something I don't really get, I'm going to try and cover, at an abstract / massive-simplification level, what I do understand in the area.  Martin has written a post  going into memory barriers  in some detail, so hopefully I can get away with skimming the subject. Disclaimer: any errors in the explanation are completely my own, and no reflection on the implementation of the Disruptor or on the LMAX guys who actually do know about this stuff. What's the point? My main aim in this s...
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