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Tips for assembling the O2 (Objective2) Headphone Amplifier Kit
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thomashunter.name
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12 years ago
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eng
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For a while I’ve been meaning to do some more advanced posts on optimization problems of all flavors. One technique that comes up over and over again is Lagrange multipliers, so this post is going to be a leisurely reminder of that technique. I often forget how to do these basic calculus-type things, so it’s good practice. We will assume something about the reader’s knowledge, but it’s a short list: know how to operate with vectors and the ..
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For a while I’ve been meaning to do some more advanced posts on optimization problems of all flavors. One technique that comes up over and over again is Lagrange multipliers, so this post is going to be a leisurely reminder of that technique. I often forget how to do these basic calculus-type things, so it’s good practice. We will assume something about the reader’s knowledge, but it’s a short list: know how to operate with vectors and the ..
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For a while I’ve been meaning to do some more advanced posts on optimization problems of all flavors. One technique that comes up over and over again is Lagrange multipliers, so this post is going to be a leisurely reminder of that technique. I often forget how to do these basic calculus-type things, so it’s good practice. We will assume something about the reader’s knowledge, but it’s a short list: know how to operate with vectors and the ..
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This post also applies to non-Exadata systems as hard drives work the same way in other storage arrays too – just the commands you would use for extracting the disk-level metrics would be different. Scroll down to smartctl if you wan’t to skip the Oracle stuff and get straight to the Linux disk diagnosis commands. I just noticed that one of our Exadatas had a disk put into “predictive failure” mode and thought to show how to measure w....
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This post also applies to non-Exadata systems as hard drives work the same way in other storage arrays too – just the commands you would use for extracting the disk-level metrics would be different. Scroll down to smartctl if you wan’t to skip the Oracle stuff and get straight to the Linux disk diagnosis commands. I just noticed that one of our Exadatas had a disk put into “predictive failure” mode and thought to show how to measure w....
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Bitcoin — the decentralized digital currency — has been making a lot of headlines lately. Much of this is driven by the current investment boom around it that has raised the exchange rates over the 1000 USD mark. But really, looking at Bitcoin as a medium for currency or asset speculation is a bad idea. Instead, we should see it purely as a medium of exchange . Not a great holder of value Much of the press stories about Bitcoin see....
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Long story short, I scored a free SGI Fuel computer along with the SGI Origin 300 computer I described two posts ago. But the SGI Fuel is a much more “usable” computer because it is a powerful single-processor graphical desktop computer (what Silicon Graphics was best known for). Here is what it comes with: 4GB RAM 600MHz R14000A MIPS CPU (64-bit) Two SCSI hard disks DVD writer Odyssey video card (DVI) that takes up the entire bottom ..
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Long story short, I scored a free SGI Fuel computer along with the SGI Origin 300 computer I described two posts ago. But the SGI Fuel is a much more “usable” computer because it is a powerful single-processor graphical desktop computer (what Silicon Graphics was best known for). Here is what it comes with: 4GB RAM 600MHz R14000A MIPS CPU (64-bit) Two SCSI hard disks DVD writer Odyssey video card (DVI) that takes up the entire bottom ..
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I’ve been looking for Java alternatives since my first days of Android development. I can’t say I don’t like Java. It’s a nice language, very easy to learn and pretty logical. But the lack of proper functional style constructions often inspires me to check what’s new in the field of JVM languages. So far I’ve tried (tried, I never learnt these languages properly): Mirah - a very nice Ruby-translated-to-Java language.
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While browsing for different breakout boards for the Rover I’ve discovered a nice little board that has a push button and logic pin to control a MOSFET. This little contraption allows switching on and off the power, say through a USB cable.
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Bitcoin — the decentralized digital currency — has been making a lot of headlines lately. Much of this is driven by the current investment boom around it that has raised the exchange rates over the 1000 USD mark. But really, looking at Bitcoin as a medium for currency or asset speculation is a bad idea. Instead, we should see it purely as a medium of exchange . Not a great holder of value Much of the press stories about Bitcoin see....
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Bitcoin — the decentralized digital currency — has been making a lot of headlines lately. Much of this is driven by the current investment boom around it that has raised the exchange rates over the 1000 USD mark. But really, looking at Bitcoin as a medium for currency or asset speculation is a bad idea. Instead, we should see it purely as a medium of exchange . Not a great holder of value Much of the press stories about Bitcoin see....
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I’ve been looking for Java alternatives since my first days of Android development. I can’t say I don’t like Java. It’s a nice language, very easy to learn and pretty logical. But the lack of proper functional style constructions often inspires me to check what’s new in the field of JVM languages. So far I’ve tried (tried, I never learnt these languages properly): Mirah - a very nice Ruby-translated-to-Java language.
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Bitcoin — the decentralized digital currency — has been making a lot of headlines lately. Much of this is driven by the current investment boom around it that has raised the exchange rates over the 1000 USD mark. But really, looking at Bitcoin as a medium for currency or asset speculation is a bad idea. Instead, we should see it purely as a medium of exchange . Not a great holder of value Much of the press stories about Bitcoin see....
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Bitcoin — the decentralized digital currency — has been making a lot of headlines lately. Much of this is driven by the current investment boom around it that has raised the exchange rates over the 1000 USD mark. But really, looking at Bitcoin as a medium for currency or asset speculation is a bad idea. Instead, we should see it purely as a medium of exchange . Not a great holder of value Much of the press stories about Bitcoin see....
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Bitcoin — the decentralized digital currency — has been making a lot of headlines lately. Much of this is driven by the current investment boom around it that has raised the exchange rates over the 1000 USD mark. But really, looking at Bitcoin as a medium for currency or asset speculation is a bad idea. Instead, we should see it purely as a medium of exchange . Not a great holder of value Much of the press stories about Bitcoin see....
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So I did a presentation on Information Security at University today. I think it went rather well, however I couldn’t show a couple of the demonstrations due to some SkyDrive files only being available online. That sucked because those were my best demonstrations, but overall I was happy. A few peopl...
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So I did a presentation on Information Security at University today. I think it went rather well, however I couldn’t show a couple of the demonstrations due to some SkyDrive files only being available online. That sucked because those were my best demonstrations, but overall I was happy. A few peopl...
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When do Oracle Parallel Execution Slaves issue buffered physical reads – Part 2?
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tanelpoder.com
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12 years ago
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eng
In the previous post about in-memory parallel execution I described in which cases the in-mem PX can kick in for your parallel queries. A few years ago (around Oracle 11.2.0.2 and Exadata X2 release time) I was helping a customer with their migration to Exadata X2. Many of the queries ran way slower on Exadata compared to their old HP Superdome. The Exadata system was configured according to the Oracle’s “best practices”, that include..
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When do Oracle Parallel Execution Slaves issue buffered physical reads – Part 2?
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tanelpoder.com
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12 years ago
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eng
In the previous post about in-memory parallel execution I described in which cases the in-mem PX can kick in for your parallel queries. A few years ago (around Oracle 11.2.0.2 and Exadata X2 release time) I was helping a customer with their migration to Exadata X2. Many of the queries ran way slower on Exadata compared to their old HP Superdome. The Exadata system was configured according to the Oracle’s “best practices”, that include..
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When do Oracle Parallel Execution Slaves issue buffered physical reads – Part 1?
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tanelpoder.com
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12 years ago
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eng
This post applies both to non-Exadata and Exadata systems. Before Oracle 11.2 came out, it was true to say that Oracle Parallel Execution slaves always do direct path reads (bypassing buffer cache) when doing full segment scans. This should not be taken simplistically though. Even when you were doing full table scans, then yes the scanning was done with direct path multiblock reads – but if you had to visit other, additional blocks out ....
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When do Oracle Parallel Execution Slaves issue buffered physical reads – Part 1?
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tanelpoder.com
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12 years ago
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eng
This post applies both to non-Exadata and Exadata systems. Before Oracle 11.2 came out, it was true to say that Oracle Parallel Execution slaves always do direct path reads (bypassing buffer cache) when doing full segment scans. This should not be taken simplistically though. Even when you were doing full table scans, then yes the scanning was done with direct path multiblock reads – but if you had to visit other, additional blocks out ....
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This is a presentation I recently gave to provide an overview of PostgreSQL and some of it's excellent features, including full-text search, multiple built in datatypes, data compression and extensions. Also, Morgan Freeman is narrating. You're welcome.
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This is a presentation I recently gave to provide an overview of PostgreSQL and some of it's excellent features, including full-text search, multiple built in datatypes, data compression and extensions. Also, Morgan Freeman is narrating. You're welcome.
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I love The Verge — I really do. Not long after posting Credibility and Bullies with Blogs , where I took Josh Topolsky to task for his wholly inappropriate reaction to many justifiable criticisms regarding his publication’s device reviews, I subscribed to The Verge. Today it not only serves as my primary news source, but I also follow The Vergecast and tune in for their live coverage of Apple’s events. Lately, however, I have been increa..
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Humility is not a very common trait with software architects. After having worked with a few awful architects and recently with a very pleasant one, I’ve compiled a few of my experiences in the way every architect loves: As a set of rules. Rule 0: Don’t assume stupidity It seems like some architects assume that developers, if left to their own devices, would behave like monkeys. In my experience, this is very rarely the case.
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As a follow-up to my original article on recursion in Puppet , and in my attempt to Push Puppet (to its limit) , I’ll now attempt some more advanced recursion techniques in Puppet. In my original recursion example , the type does recurse, but the callee cannot return any value to the caller because it is a type, and not strictly a function. This limitation immediately limits the usefulness of this technique, but I’ll try to press o..
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As a follow-up to my original article on recursion in Puppet , and in my attempt to Push Puppet (to its limit) , I’ll now attempt some more advanced recursion techniques in Puppet. In my original recursion example , the type does recurse, but the callee cannot return any value to the caller because it is a type, and not strictly a function. This limitation immediately limits the usefulness of this technique, but I’ll try to press o..
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Kirill Zubovsky is the founder of Scoutzie, an online marketplace that connects designers and clients.
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Back in May I wrote Nickelodeon’s Experiment where I talked about the network’s hit animated series Avatar: The Last Airbender and its sequel, Avatar: The Legend of Korra . Last week the latter’s show finished its second season with the final episode of “Book Two: Spirits”. In preparation for the third, I thought I would post a mid-series update. As with my last article on this topic, spoiler alert, I will give away big parts of the ..
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I wrote this article for the Sidebolt company blog . Reposting it here for your reading pleasure! Our latest game Skyward Slots makes extensive use of JSON. We send Gigabytes of it flying back and forth haphazardly between client and server over a WebSocket connection. At first, we wrote code by hand to pack and unpack each message. Later on we decided that life is too short for that. In the beginning, we just dove into the JSON righ..
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I wrote this article for the Sidebolt company blog . Reposting it here for your reading pleasure! We publish our games on both Mac and iOS. Since UIKit is not available on Mac, we have to build all of our UI by hand in Cocos2D. One of the hardest parts to get right was emulating the UIScrollView bouncy scroll formula. Here it is in action: There are tons of implementations available in nearly every language and framework, but few of..
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Many years ago there was a Rails app. It started with things. These things were actually blueprints for other things. The other things needed many associated parts, and parts of parts. How many? The blueprints knew. The blueprints absolutely had to have an admin interface, but changing the blueprints would cause a chain reaction on things and parts. Every modification to the things and their blueprints permeated throughout the coupled netwo....
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