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Currency Traders Telnet Game

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A new, large Currency Traders game is up. To connect enter the following command from an xterm, konsole, or other terminal/command line window:

telnet teotwawkigames.com

It runs on port 23, just like traditional telnet. It's free to play and no software is required to play. All you need is an internet connection.

This is an old-school, no-graphics strategy game. All you need is a telnet client to play -- and every modern operating system comes with one. It's free and you can play anonymously. Just choose a name and a password and log in. If you don't know what to do, just press your H key for a Hint and a context-sensitive Tip.

This game is played in a persistent world where whatever you build, buy, or otherwise 'acquire' in the game will still be there tomorrow. Unless you make an enemy of another player, that is. PVP (player-versus-player) is always enabled here so other players can attack your deployed fortifications -- or even, heaven forbid, you.

This is a turn-based game that can be played any time of the day, night, or week. Each player is issued a certain amount of energy (turns) per day that is used to travel, trade, or play at the arcade in the several Malls. If you don't use your turns, they accumulate for as much as several months -- so there's no disadvantage to skipping a day or even a few weeks.

A slightly longer description of Currency Traders is here.
mail this link | permapage | score:9553 | -Ray, January 23, 2013

Apple DIY Repair

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I won't be buying any more Apple products. Here's why:

I'm generally capable of repairing my own equipment and can recognize when self-repair has been deliberately undermined. I recently had to replace a hard drive in an early generation white Intel iMac. Innocently, I believed the interior was accessible and serviceable in the manner of the externally identical white PowerPC iMacs.

No such luck. Not only do you have to remove the LCD to get to the hard drive, but you must also remove shielding around the LCD -- mostly by tearing it to bits. No doubt it is attached this way so that an authorized Apple technician will be able to confidently void your warranty if you've ever worked on the system yourself.

You'll also need a #10 torx magnetic screwdriver. And, no, #10 torx bits just won't do due to the narrow and deeply recessed screw holes. Also, since most torx screwdrivers aren't magnetic, you'll probably need to tape the screws to the screwdriver to reattach the LCD. Good thing there's a hardware store near you.

Oh, and don't forget to pick up some rubber cement to 'properly' reattach the hard drive temperature sensor while you're out looking for magnetic torx screwdrivers.

Considering the logical design of its predecessor and the tamper-evident shielding, I'm certain that this machine has been deliberately designed to prevent the owner from performing DIY upgrades and repairs.

While that is all quite annoying, at least working on the system is possible for someone with experience and determination.

Now, Apple has improved their anti-customer techniques with the 'Pentalobe' screw. It doesn't solve any problem but one: it'll keep customers from even being able to open the case.

If you're curious about Apple's evil new invention, you can read its rap sheet and view its mug shot here.
mail this link | permapage | score:9490 | -Ray, January 25, 2011

VPS: Xen vs. OpenVZ

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This is a short overview of the key differences between OpenVZ and Xen that you might consider when choosing a VPS. Note that this article is based on my opinions and that you must do your own research to determine which, if either, technology is best for you and your application.

First, some terminology. OpenVZ isn't fully virtualized and could be more properly referred to as a 'container', not a VPS. That shouldn't affect your choice. It's the technical differences that matter.

Cheap VPS offers are everywhere lately, it seems. However, upon closer inspection I saw that almost all of the low-priced offers were for OpenVZ. While both Xen and OpenVZ offer their advantages, I chose Xen. So, there's my first bias, right up front. :)

OpenVZ advantages:

  • Efficient (fast)
OpenVZ disadvantages:
  • Shared kernel (no custom kernel)
  • Shared memory with other users
  • Vendor can easily oversell, killing performance
Xen advantages:
  • Dedicated memory
  • fully virtualized (can run other kernels or even OS's)
  • vendor more limited in overselling
Xen disadvantages
  • Less efficient (more overhead due to a kernel-per-VPS)

You'll notice I left price out of the above comparison. In theory, there should be a small price advantage for OpenVZ. I don't know how big it should be but it pertains to two things: 1) Xen uses more memory due to each VPS having its own kernel, and 2) Xen uses more CPU, also due to the additional software layer required to virtualize the kernel.

In practice, however, the price gap appears larger than the above technical differences suggest it should be. I think the remainder of OpenVZ's price advantage is based on 1) the ability for a vendor to easily oversell OpenVZ, and 2) The price competition that results from some vendors overselling OpenVZ.

OpenVZ doesn't encapsulate its containers into a fixed amount of memory, so it runs processes in the host environment to monitor memory usage and kill processes as a container allocates more than its assigned amount.

As a result of this difference, loading down an OpenVZ container is problematic. To partially offset this disadvantage, most OpenVZ vendors offer 'burst' memory in addition to 'dedicated' memory. That is, the monitor process is set to allow the container to use more than its allocated memory -- for a short period of time. This messy situation results in a potentially unreliable environment as some of your processes may be arbitrarily killed -- at the busiest times.

Xen, on the other hand, allows the use of a swap space and excess memory allocation results in (hopefully) idle segments being rolled out to the swap area. While this is good for the memory-hungry VPS user, it can consume significant I/O capacity when memory is overallocated to the point of busy segments getting swapped out. This is bad for everyone sharing the underlying hardware.

I see Xen as clearly the superior technology. A Xen VPS feels and behaves more like a dedicated server. However, I still would have purchased OpenVZ at some price difference. After a bit of research, however, I located Xen VPS's at practically the same price as the cheapest OpenVZ containers. That made my decision easy.

With that said, keep in mind that a bad hosting vendor can ruin either technology through various means. Both technologies share the disk drives and I/O paths as well as the processor cores. Hardware can be poorly configured and managed in any case. A reputable vendor is probably the single most important consideration in choosing a virtual server.

Lastly, carefully check the 'allowed use' policy. Make sure your application is allowed on the server you intend to purchase. Note that due to their different characteristics, the allowed use policy may differ between OpenVZ and Xen for the same host. Also, it's good to understand the memory usage characteristics of your applications. If you know how much memory/swap they require on a physical system, it'll probably work with that same amount of memory/swap on Xen.

[I'll post a review shortly of my current VPS vendor and I will then add a link to that article here.]

mail this link | permapage | score:9483 | -Ray, June 13, 2011

Linux dominates Windows

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Linux dominates Windows -- and everything else -- on supercomputers in 2010. Microsoft's renowned engineering quality and down-to-earth pricing shows brilliantly in its capturing 1% of the top 500 supercomputer projects. Perhaps next year, utilizing all the organizational pressure they can bring to bear, they can retain 0.8%.

Formal Unix, now long dead*, controls 4.4%. Meanwhile, Linux is now installed on 91% of the remaining 95% of top systems. Add in the single BSD system and you have Unix-like systems (Unix+Linux+BSD) accounting for 95.6% of the top supercomputer projects. The remaining 3.4% of are 'mixed' systems and may also contain significant percentages of Unix and Linux.

There are many reasons for Linux' success. Among the top factors are surely these four, in no particular order:
  • Price (starting at free)
  • Quality (excellent code, Unix-based design)
  • Hardware Support (most all modern quality gear is supported)
  • Open Source (open to tinkering -- and redistributable)
Check my math on the top 500 systems here.

*Of course, counting functional Unix systems while ignoring the trademarked term, Unix is clearly not dead since Linux is one of the truest of the true Unix work-alike systems. Linux is, of course, the reason formal Unix has suffered such a precipitous decline. Many Unix users just switched flavors -- and Linux was a most appealing flavor.
mail this link | permapage | score:9375 | -Ray, June 2, 2010
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