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February 3rd, 2012

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I'm interested because I'm interested in doing more real-time stuff with Websockets and Mongrel2:

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February 2nd, 2012

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February 2nd, 2012

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VPSes were never a serious option for the reasons stated in this article. it's impossible to track down performance problems when a dozen other VPS customers on the same server are taxing the CPUs and disks. i do use one that i pay $10/month for just to run a network monitor for some off-network perspective. they can be useful for single-task servers that don't need a lot of processing power like dns servers. Serpina online without prescription, with dedicated servers, though, you can signup on a website and within a few hours have a complete server with modern CPUs, disks, and lots of memory assembled, tested, and connected to the internet with a remote console waiting for an o/s installation. when hardware goes bad, the server provider has lots of spare parts waiting around to be swapped in for free. and the best part of all, when you're ready to upgrade or move to a different provider, you just cancel the account and let the provider worry about what to do with the old hardware. i have a handful of these on various providers costing between $140-$190 a month for something like a core i5 ~2ghz with 8gb of ram, 2 big sata drives, and 100mbit ethernet with more than enough transfer every month.

Having said that, I should say I've got most of my sites on the Rackspace Cloud, and its been a great experience.

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January 25th, 2012

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Adding together the lack of any real-world example, performance experiment, and implementation indication or detail, we are left with an obscure exercise using unfamiliar mathematics and of little or no practical consequence. It can be safely rejected.

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January 20th, 2012

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January 18th, 2012

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master
* spinach_features
remotes/origin/HEAD -> origin/master
remotes/origin/master
remotes/origin/spinach_features

C:\Sites\deals\deals_intranet>git push
To git@github.com:shermanstravel/deals_intranet.git
. [rejected] spinach_features -> spinach_features (non-fast-forward)
error: failed to push some refs to
'git@github.com:shermanstravel/deals_intranet
.git'
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Switched to branch 'remotes/origin/spinach_features'

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master
* remotes/origin/spinach_features
spinach_features
remotes/origin/HEAD -> origin/master
remotes/origin/master
remotes/origin/spinach_features

C:\Sites\deals\deals_intranet>git pull
git@github.com:shermanstravel/deals_intranet.git spinach_features
From github.com:shermanstravel/deals_intranet
* branch spinach_features -> FETCH_HEAD
Merge made by recursive, priligy order. Find cheap priligy online, features/campaign_active_dates.feature | 21 ++++++++++---------
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tl;dr - Your 1920x1080 TV takes a 1920x1080 signal, chops the edges off it and then stretches the rest to fit the screen because of decisions made in the 1930s.

So you plug your computer into a TV and even though you know what the resolution really is you still don't get to address the individual pixels. Even worse, the edges of your screen are missing. Penis growth pills online without prescription, The best thing about overscan is that it's not rigorously standardised - different broadcast bodies have different recommendations, but you're then still at the mercy of what your TV vendor decided to implement. So what usually happens is that graphics vendors have some way in their drivers to compensate for overscan, which involves you manually setting the degree of overscan that your TV provides. This works very simply - you take your 1920x1080 framebuffer and draw different sized black borders until the edge of your desktop lines up with the edge of your TV. The best bit about this is that while you're still scanning out a 1920x1080 mode, your desktop has now shrunk to something more like 1728x972 and your TV is then scaling it back up to 1920x1080. Once again, you lose.

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January 2nd, 2012

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HTTP was invented in 1989 and has done well for the last 22 years, penis growth oil us. But we are entering a new era, penis growth oil online without prescription. Buy discount penis growth oil, It seems likely that HTTP will face a slow eclipse, an out-dated protocol, penis growth oil online pharmacy. Order generic penis growth oil, It seems like that the future belongs to WebSockets. And what kind of network will be built with that, buy cheapest penis growth oil. Penis growth oil without rx, Some critical voices:

The WebSocket protocol design was hijacked by architecture astronauts who decided that it must have all of these extra features added, instead of remaining a simple, compare penis growth oil prices online, Order penis growth oil cheap online, easily implementable and understandable protocol. Penis growth oil online without prescription, The original WebSocket protocol was a simple stream of delimited messages, with the only complexity being in the handshake that was necessary to ensure that JavaScript apps couldn't send arbitrary data to arbitrary ports without permission.

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And some praise:

I think his analysis is flawed. WebSocket is a message based protocol that does not specify a maximum message size in the RFC. This does not make it a streaming protocol until an implementation decides to deliver incomplete messages to the end application. Penis growth oil online without prescription, Some implementations have done this, many (including all browsers) have not and will not.

Time and time again it has been demonstrated that we are bad at choosing a maximum allowed value for all applications and all future considerations (see: ethernet frame sizes, IP address lengths, operating system address spaces, file system block sizes/counts, etc).

In some cases (many of those previously listed) there were hardware, cost, or technical concerns that led to nailing down a number in an RFC. For WebSocket there is no clear benefit to forever encoding a specific numeric maximum message size. It is a high enough level protocol that there is no technical or cost benefit to make message sizes limited by anything other than individual application needs.
As such, the WebSocket RFC leaves maximum message size implementation defined, and specifically says that an implementation SHOULD implement a reasonable maximum message size for its purpose, penis growth oil online without prescription. A chat application that knows it will only be moving small text messages can set its maximum message threshold small to improve buffer performance and catch invalid messages sooner. An application that finds a business case for sending a large file in one large message can set itself up accordingly. Generic WebSocket parsers should expose a method of setting the maximum message size the application wishes to receive.

I definitely agree that not requiring implementations to return their maximum message size along with the "Message too big" error will make some sorts of interoperability more difficult. However, it also prevents exposing implementation security details and simplifies the core spec (the author has already complained that the spec is too complicated already). It is relatively simple for an application to negotiate a maximum message size privately if necessary and the WebSocket extension mechanism allows a method for standardizing a way of doing so if this turns out to be a serious issue in the future.

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December 30th, 2011

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$value = $array[$key];

// .., cheap patanol online. Patanol, }
Instead of the much more intuitive and straightforward:

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Microoptimization is evil, patanol online without prescription. Usually it only wastes your time and doesn’t give any measurable performance improvements, patanol online without prescription. Cheapest generic patanol online, The copying behavior of foreach is somewhat more complicated than most people think. Often the “optimized” variant happens to be slower than the original, cheapest patanol prices. Patanol prescription, When does foreach copy. Patanol online without prescription, Whether or not foreach copies the array and how much of it depends on three things: Whether the iterated array is referenced, how high its refcount is and whether the iteration is done by reference.

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The following code looks very similar to the previous one, where to order patanol. Patanol vendors, The only difference is that the array is now passed as an argument. This seems like an insignificant difference, patanol no rx, Patanol prices, but it does change the behavior of foreach: It now will copy the array structure, but not the values (proof; if you want to see that this is really only the structure being copied compare this and that script, patanol free delivery. Patanol for order, The first only copies the structure, the second copies both).

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Galois’s Approach: The Big Idea

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In this post I want to investigate the memory usage of PHP arrays (and values in general) using the following script as an example, which creates 100000 unique integer array elements and measures the resulting memory usage:

$startMemory = memory_get_usage();
$array = range(1, buy omnicef online without prescription, Omnicef information, 100000);
echo memory_get_usage() - $startMemory, ' bytes';
How much would you expect it to be, cheap omnicef from usa. Cheap omnicef, Simple, one integer is 8 bytes (on a 64 bit unix machine and using the long type) and you got 100000 integers, buy omnicef on internet, Buy omnicef online, so you obviously will need 800000 bytes. That’s something like 0.76 MBs, buy omnicef low price.

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| 64 bit | 32 bit
---------------------------------------------------
zval | 24 bytes | 16 bytes
+ cyclic GC info | 8 bytes | 4 bytes
+ allocation header | 16 bytes | 8 bytes
===================================================
zval (value) total | 48 bytes | 28 bytes
===================================================
bucket | 72 bytes | 36 bytes
+ allocation header | 16 bytes | 8 bytes
+ pointer | 8 bytes | 4 bytes
===================================================
bucket (array element) total | 96 bytes | 48 bytes
===================================================
total total | 144 bytes | 76 bytes
The above numbers will vary depending on your operating system, your compiler and your compile options. E.g, omnicef approved. Buy cheap omnicef internet, if you compile PHP with debug or with thread-safety, you will get different numbers, omnicef online cheap. Omnicef rx, But I think that the sizes given above are what you will see on an average 64-bit production build of PHP 5.3 on Linux.

If you multiply those 144 bytes by our 100000 elements you get 14400000 bytes, omnicef tablets, Buy generic omnicef online, which is 13.73 MB. That’s pretty close to the real number - the rest is mostly pointers for uninitialized buckets, but I’ll cover that later, omnicef online without prescription.

Now, find discount omnicef, Omnicef medication, if you want to have a more detailed analysis of the values mentioned above, read on :)

The zvalue_value union
First have a look at how PHP stores values, omnicef for order. Omnicef cheap drug, As you know PHP is a weakly typed language, so it needs some way to switch between the various types fast, omnicef vendors. Order omnicef no prescription, PHP uses a union for this, which is defined as follows in zend.h#307 (comments mine):

typedef union _zvalue_value {
long lval; // For integers and booleans
double dval; // For floats (doubles)
struct { // For strings
char *val; // consisting of the string itself
int len; // and its length
} str;
HashTable *ht; // For arrays (hash tables)
zend_object_value obj; // For objects
} zvalue_value;
If you don’t know C, buy omnicef no prescription required, Omnicef in uk, that isn’t a problem as the code is pretty straightforward: A union is a means to make some value accessible as various types. For example if you do a zvalue_value->lval you’ll get the value interpreted as an integer, find discount omnicef online. If you use zvalue_value-> Omnicef online without prescription, ht on the other hand the value will be interpreted as a pointer to a hashtable (aka array). Certified omnicef, But let’s not get too much into this here. Important for us only is that the size of a union equals the size of its largest component, pharmacy omnicef. Order omnicef from canada, The largest component here is the string struct (the zend_object_value struct has the same size as the str struct, but I’ll leave that out for simplicity), omnicef no prescription. Buy cheapest omnicef online, The string struct stores a pointer (8 bytes) and an integer (4 bytes), which is 12 bytes in total, omnicef drug. Due to memory alignment (structs with 12 bytes aren’t cool because they aren’t a multiple of 64 bits / 8 bytes) the total size of the struct will be 16 bytes though and that will also be the size of the union as a whole, omnicef online without prescription. Omnicef overnight delivery, So now we know that we don’t need 8 bytes for every value, but 16 - due to PHP’s dynamic typing, omnicef pharmacy online. Multiplying by 100000 values gives us 1600000 bytes, i.e. 1.53 MB. But the real value is 13.97 MB, so we can’t be there yet.

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December 17th, 2011

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Namenda online without prescription, In some ways, this sounds like an insightful write up, comparing the ability to add numbers in Lush versus Clojure:

I have avoided the JVM my entire life. Order namenda no prescription, I am presently confronted with problems which fit in the JVM; JVM libraries, concurrency, namenda buy online, Namenda free delivery, giant data: all that good stuff. Rather than doing something insane like learning Java, find namenda no prescription required, Cheap namenda online, I figured I’d learn me some Clojure. Why not, canadian pharmacy namenda. Namenda overnight, It’s got everything I need: JVM guts, lispy goodness; what is not to love, namenda australia.

Well, as it turns out, one enormous, gaping lacuna is Clojure’s numerics performance, namenda online without prescription. Compare namenda prices online, Let’s say you want to do something simple, like sum up 3 million numbers in a vector, cheap namenda from usa. Namenda uk, I do shit like this all the time. My entire life is summing up a million numbers in a vector, buy discount namenda online. Buy namenda, Usually, my life is like this:

(let* ((tmp (rand (idx-ones 3000000))))
(cputime (idx-sum tmp)))

0.02
20 milliseconds to sum 3 million random numbers enclosed in a nice tight vector datatype I can’t get into too much trouble with, namenda online stores. Namenda online without prescription, This is how life should be. Order discount namenda online, Hell, let me show off a little:

(let* ((tmp (rand (idx-ones 30000000))))
(cputime (idx-sum tmp)))

0.18

180 milliseconds to sum up 30 million numbers, buy namenda cheap. Cheap namenda, Not bad. 60 times worse than I’d like it to be (my computer runs at 2Ghz), online pharmacy namenda, Cheapest generic namenda online, but I can live with something like that.

Now, namenda cheap drug, Order cheap namenda, let’s try it in Clojure:

(def rands (repeatedly rand))
(def tmp (take 3000000 rand))
(time (reduce + tmp))

Java heap space
[Thrown class java.lang.OutOfMemoryError]

Restarts:
0: [QUIT] Quit to the SLIME top level

Backtrace:
0: clojure.lang.RT.cons(RT.java:552)
(blah blah blah java saying fuck you java blah)

Oh. Shit, namenda online without prescription. Adding 3 million numbers makes Clojure puke, namenda from india. Namenda bangkok, OK. How well does it do at adding, buy namenda no prescription required, Order namenda from us, erm, 1/10 of that using my piddley little default JVM with apparently not enough heap space (@130mb), sale namenda. No rx namenda, (time (reduce + tmp)) "Elapsed time: 861.283 msecs"

Um, holy shit, buy namenda lowest price. Generic namenda cheap, Well, there is this hotspot thing I keep hearing about…

user> (def ^doubles tmp (take 300000 rands))
user> (time (reduce + tmp))
"Elapsed time: 371.451 msecs" 149958.38785575028

user> (time (reduce + tmp))
"Elapsed time: 107.619 msecs" 149958.38785575028

user> (time (reduce + tmp))
"Elapsed time: 46.096 msecs" 149958.38785575028

user> (time (reduce + tmp))
"Elapsed time: 43.776 msecs"

Great; now I’m only a factor of 20 away from Lush speed … assuming I run the same code multiple times, cheapest namenda online, Buy cheapest namenda online, which has a probability close to zero. Otherwise, cheap namenda in canada, Namenda tablet, with a typedef, I’m a factor of 200 away.

But as someone pointed out, where to buy namenda, Order namenda without prescription, his examples seem to have Lush start with 30 million numbers, whereas in the Clojure example he has to generate the 30 million numbers, generic namenda. Buy namenda online cheap, Done differently, the speed gap does not need to be so wide, find cheap namenda online. Cost namenda. Find namenda online.

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December 15th, 2011

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This sounds like a very difficult bug to track down:

Modalert online without prescription, My personal understanding of Rails up until an hour ago was that a CSRF violation would raise an exception. Modalert approved, This would practically never get seen by a legitimate user operation, so few people are aware of that, approved modalert pharmacy, Modalert sales, but I had seen it a time or two when security auditing BCC. (Some of my geeky friends had, purchase modalert no rx, Modalert generic, back in the day, exploited BCC with a CSRF and helpfully told me how to fix it, order modalert no prescription required. Modalert overnight shipping, Naturally, after fixing it I verified that the site worked as expected with the fix.)

So if the CSRF protection was somehow eating sessions, modalert in australia, Discount modalert online, I would expect to see that exception getting logged and emailed to me by Airbrake (formerly Hoptoad — it emails you when an exception happens in production, highly recommended), modalert from india. Modalert buy online, That wasn’t happening.

Then I decided to dig into the Rails source, modalert online without prescription. Whereupon I learned that Rails 2.3.11 changed the behavior of CSRF protection: instead of throwing exceptions, modalert overnight delivery, Cheapest modalert, it would silently just clear the session and re-run the request. For most sensitive operations (e.g, buy modalert internet. Buy discount modalert, those which require a signed in user), this would force a signout and then any potentially damaging operation would be averted, cheapest modalert prices. Order modalert from us, Here’s the relevant code in Rails 2.3.11:

def verify_authenticity_token
verified_request. || handle_unverified_request
end

def handle_unverified_request
reset_session
end

Versus the relevant code in Rails 2.3.10 (sidenote: you can see all of this easily in Github because Rails is diligent about tagging releases, modalert drug, Modalert rx, a practice you should certainly follow in your own development):

def verify_authenticity_token
verified_request. || raise(ActionController::InvalidAuthenticityToken)
end

And, buying modalert online, Cost of modalert, sure enough, checking Subversion showed that I upgraded the version of Rails I was using in January of this year in response to this security advisory, buy modalert in canada. Modalert without prescription, I read that, made the required modifications to my application, discount modalert overnight delivery, Cheap modalert pharmacy, tested, and had no problems.

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December 14th, 2011

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Micardis online without prescription, In theory, this is a rant against Coffeescript, but at the theoretical level, it is a rant against easy to read languages that are actually tough to comprehend.

CoffeeScript encourages writing code in sentences instead of logical statements, discount micardis without prescription. Drug micardis, eat food for food in foods

That looks great on the demo page, but eventually you end up with something more like this:

wash plate, order micardis no prescription required, Micardis for sale, brush, sink for key, buy micardis online australia, No prescription micardis, plate of dishes when plate.dirty if meal.status is 'done'

That is verbally readable code, but it’s not very comprehensible:

What is plate, compare micardis prices online. Micardis cheap, The left side of the line (the side you scan while reviewing and debugging code) depends on stuff in the middle. You have to see plate then find it later in the line to know what it is, micardis free sample, Cheap micardis no rx, then come back to see what you’re doing with it.
Why is the plate still dirty in the app?, micardis online without prescription. There are three things that could screw up that single line of code

dishes is empty, micardis in us, Order micardis in us, 8 words in you know you’re dealing with dishes.
The plate isn’t dirty, buying micardis, Cost of micardis, 10 words in.
The meal.status isn’t done, micardis for order, Canada micardis, at the very end of the line
So all the things that determine whether or not the plate gets washed are deep inside the line. Though easy to read out loud, cheap micardis in canada, Find discount micardis, very hard to comprehend while scanning. Micardis online without prescription, Verbally readable code states the logic backwards. To comprehend it, micardis non prescription, Cheap price micardis, you have to understand it from right to left, which takes more time, best price for micardis. Cheap micardis online, I’d probably write the wash plate line like this, assuming its inside of a function:

if meal.status isnt 'done'
return

for key, sale micardis, Buy micardis online cheap, plate of dishes
if plate.dirty
wash plate, brush, micardis side effects, Micardis buy online, sink

Totally clear when a block of code will run, and much easier to scan, find micardis no prescription required. Discount micardis no rx, Also, not substantially different than some fast-and-loose JavaScript:

if (meal.status !== 'done')
return

for (var plate in dishes)
if (dishes[plate].dirty)
wash(dishes[plate], buy generic micardis, Buy micardis internet, brush, sink);

Though, purchase micardis without prescription, Cheap micardis no prescription, I’d write it like this:

if (meal.status !== 'done') {
return;
}
for (var plate in dishes) {
plate = dishes[plate];
if (plate.dirty) {
wash(plate, brush, micardis purchase, Buy micardis on internet, sink);
}
}

The one-liners are very tempting as the author: you’re head is already wrapped around the problem so it’s easier to stay in context, giving you the false idea that it’ll make more sense to everybody else, cheap micardis in usa. No rx micardis, Don’t believe me. Check out this one-liner I pulled out of the first .coffee file I randomly opened from our application:

scores = (student["assignment_#{@assignment.id}"].score for own idx, find micardis online, Micardis in australia, student of @gradebook.students when student["assignment_#{@assignment.id}"]?.score?)

That’s 160 columns of “readable code” that turns into this for debugging ಠ_ಠ:

var idx, scores, lowest price for micardis, Online micardis, student;
var __hasProp = Object.prototype.hasOwnProperty;

scores = (function() {
var _ref, _ref2, _results;
_ref = this.gradebook.students;
_results = [];
for (idx in _ref) {
if (!__hasProp.call(_ref, idx)) continue;
student = _ref[idx];
if (((_ref2 = student["assignment_" + this.assignment.id]) != null . _ref2.score : void 0) != null) {
_results.push(student["assignment_" + this.assignment.id].score);
}
}
return _results;
}).call(this);

Source

December 14th, 2011

In Technology

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Microlean online without prescription, This makes me hopeful. More to the point, free microlean, Find cheap microlean online, it makes me want to work on desktop apps with Clojure.

Starting a Clojure Desktop Application
We’re starting up our first desktop application in Clojure, get microlean. Drug microlean online purchase, We’re a heavy vim and ruby shop. We’ve done several desktop applications in JRuby, buy no rx microlean. This is the first time we’ve tackled swing UIs and GUI testing in Clojure, microlean online without prescription. Microlean cheapest price, It’s still early in the process, but here’s what we’ve found so far, microlean bangkok. Microlean medication, Swing
For Swing, we’re using seesaw, price of microlean. Generic microlean online, It provides Clojure bindings to standard Swing widgets and MigLayout, which was all I set out looking for, buy microlean online without prescription. Microlean no rx, What really impressed me, however, microlean overnight, Buy microlean us, was its CSS selector engine, allowing you to query a frame for particular widgets for event subscription or manipulation, find cheap microlean. Microlean online without prescription, It also offers an impressive data binding mechanism similar to UNIX pipes, complete with transformations and tee. Microlean no prescription, Testing
We’re using Brian Marick’s Midje for unit testing and fest to automate system tests.

Packaging
Leiningen manages our dependencies and packages our jars, microlean rx. Microlean tablet, We’ve found it helpful to set up a local maven repository in our vendor directory for a couple of cases where we needed a jar that was neither in the main maven repository nor clojars.

Editing
We’re heavy Vim users here at AO, pharmacy microlean, Microlean pills, but as fantastic as VimClojure is, paredit.vim from slimv just doesn’t compare to Emacs’ glorious mode, microlean discount. Tablet microlean, I’m pretty incompetent in Emacs, but the Emacs starter kit and a weekend of practice with Emacs and ParEdit has taken the shine off my beloved vim for lisp editing, microlean sales. Order microlean from canada, (It’s actually been a while since I last used Emacs, so I’m sticking with vim in the short term while I ramp back up with Emacs), microlean buy drug. Canadian pharmacy microlean,

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December 14th, 2011

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My name is Lawrence Krubner. I run WP Questions and now, in October of 2011, I am trying to start Tutor Ruby, a place where Ruby beginners can hire some quick help with urgent questions.

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