Sunday, February 20, 2011

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The concept of cluster (3 of 3)

the chest of memories came to receive the documentation of my final project. I was surprised to reread the introduction to my work (a computer simulation framework applied to cache coherence in NUMA machines) and I clearly see what they say: I am of letters and a mole in the technology world. I'll post the introduction of three fragments. To put this into context, let us consider that I wrote back in 2005, I have not changed a comma and then it was probably a lot smarter now ...

The first of these solutions would be to overcome the disabilities of computing power and speed of the fastest processors possible to build (and cheaper) combining the skills of many simple processors. Thus, computing clusters has allowed the treatment volume surprising information and respond to unmet needs of power before. Would for example, computing clusters rendered images, modeling weather or stock. And as crude version of such clusters would appear the load-balancing clusters that share the work between various machines semiparalela. For example in the case of web server farms that share the responsibility to meet the requests of the customers' browsers.

other hand, the redundancy of some of the sensors and processors of human organisms inspire other types of clusters. Clusters of high availability or fault tolerant, able to cope their duties with tolerable loss of performance even after a failure in one of its elements.

But the clusters have managed to generate a new computational model comparable to that of the Turing machine? The answer is no. Finally, improvements have been made (not always) at the speed of execution of complex algorithms, but in theory there is nothing to prevent a Turing machine to perform the same task. Does this mean that this line of research is dead and useless? Here each of the parties to the dispute give their own version of events.

as technology clusters would undeniably useful and practical. On the one hand, freeing the computing capacity of the machines of progress in building processors with more capacity and higher cost. The power to solve a task with items cheaper and more scalable systems has obvious advantages in the real world application of information technology. So in this sense does not seem likely cease to exist, this type of machine or leave it for research in this line.

However, from the theoretical point of view we have seen that this type of equipment has revolutionized the science as some expected and that finally brings no new computing model. What has been the failure? The initial idea based on observation of human beings and their complex parallel processing did not seem wrong, the question is what are the computer clusters or parallel machines really only give an illusion of parallelism? If the algorithms implemented on a cluster computer can theoretically (without limitation of time and memory) to run on a Turing machine, it is clear that parallelism does not exist and is merely an illusion of parallelism equal to that already existed in the machines uniprocessor running multithreaded applications and multi-parallel giving an impression of unreality. However, the research should not be abandoned as invalid, because there is no evidence that is incorrect, the results achieved are not yet satisfactory.

This search for a new parallel computing model really has not been abandoned at all. The new concepts provided by relativity in the physical sciences and experimental studies have come to open up new scenarios for this new parallel model. Quantum computers can address a new computer model in which computing states would no longer be 0 or 1 binary and exclusive but could coexist simultaneously. In this sense (moving parallel and could not be otherwise so) the newest theories in psychological science begin to model the mental processes of the same way: with simultaneous states. That is, with real parallelism.

So, in my view the evolution of computing as a science will present identification and realization of this new computational model. On the other hand, computing and technology will continue to address, given its advantages, and for quite some time building and improving multiprocessor machines or clusters.

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The concept of cluster (2 of 3)

the chest of memories came to receive the documentation of my final project. I was surprised to reread the introduction my work (a computer simulation framework applied to cache coherence in NUMA machines) and I clearly see what they say: I am of letters and a mole in the technology world. I'll post the introduction of three fragments. To put this into context, let us consider that I wrote back in 2005, I have not changed a comma and then it was probably a lot smarter now ...

Proponents of strong AI, heirs to the association psychology, based his belief in the strength of the Turing model in which complex algorithms that define the mental processes have only been out of the current practical achievements Turing machine technology disability. It would be enough for them to increase the ability to create more complex and fast processors for more complex algorithms could be resolved in human times (assuming that these algorithms are definable).

Moreover, as we have seen, another line of research would deny the Turing completeness of the model itself and explore new practical achievements of prototypes based on existing technologies. In this sense, it addresses the implementation of algorithms in parallel: the same way that the functioning of a human being is based on the binding of the mini work of millions of singles (Neurons) that deal with small amounts of information received by their systems of input / output (sensory organs), and the future model that correctly completed the current machine would be based on the parallel execution of different tasks by processors, not necessarily complex, and the final processing of all this information in a kernel, not necessarily nuclear, ie they could be distributed on several machines-that would serve as the brain in the machine.

Thus arises the concept of cluster could be defined as a set of computers that come together to contribute, in aggregate, to better performance total computer. We might refer to high-performance multiprocessor machines by a particular manufacturer or sets of computers built using common hardware components, typically personal computers. The clusters will provide from the technological point of view, from its origins, solutions to problems that were left unresolved.

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The concept of cluster (1 of 3)

the chest of memories came to receive the documentation of my final project. I was surprised to reread the introduction to my work (a computer simulation framework applied to cache coherence in NUMA machines) and I clearly see what they say: I'm from Lyrics and infiltrated into the technological world. I'll post the introduction of three fragments. To put this into context, let us consider that I wrote back in 2005, I have not changed a comma and then it was probably a lot smarter now ...

Since the beginning of computing as a science until the present, through its emergence as a technology after the Second World War, their movement has followed two parallel paths often closely related: first computer science appears as an effort to model the unknown human mind and its processes using the tools offered him mathematics, is well placed the service of research in the field of psychology and illustrates its modeling existing controversies in this field. On the other hand, is converted to happen in practical technology in a way that allows information processing tasks above (in speed and volume) that you can make a human.

We are heirs of the original concept of the Turing machine defined, but this machine seems in some areas of science as inadequate and clumsy. Thus, cognitive psychologists found that modeling of the human mind that can afford a Turing machine is partial and crude and leaves unexplained many of the mental processes more complex and beautiful human beings. And furthermore, for artificial intelligence appear as obstacles frustrating limitations of this model to run complex algorithms that allow machines to increase their capacities to human levels.

Presumably, this double path of development followed by information technology remains the model of evolution of this discipline. Thus, as more advance knowledge about our own mental processes even more advance technology, allowing us to create artificial minds increasingly similar to those of humans. If the Turing machine appears to be insufficient, you should see new models.

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Saturday, February 5, 2011

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The mad house at dusk


"Imagination is the mad house" Santa Teresa de Jesus


"The Crazy House" by Rosa Montero is a book of dubious generic assignment somewhere between essays, novels and biography fabled, in which the author provides an informal speech about the imagination, literature and the boundaries between reality and fiction.

This is a book of vague boundary that is easier to say what it is: not a formal treaty or poetic, is not an essay on the craft of writing, there is a novel and is not, or is in any degree, a biography. In the hands of the imagination, the mad house, the author portrays the limits of creation and the folly of human nature and its insertion into the reality and fears and frustrations of the literary creator, namely the novelist.

a quality book is unbalanced, in which moments of brilliance alternated with heavy digressions that add nothing to what is already known. Sorry for not able to fully participate in the game that offers the reader and have stayed on the path of the labyrinth admiring some detail and losing the final goal, if there was. I'll take the hit with it would build a lighter book parallel.

not know the rest of the work of Rosa Montero so my opinion is confined exclusively to this work given in isolation. I think it may be of interest to people attracted by literature, fans and theorizing write lightly.

parallel in my book would not miss what I consider the most brilliant passage in the book and thus justifying their reading. Begins:

"" Today I wanted to write, I had all day to write, and I have thrown overboard answering e-mails.
- Why?
I do not know. Sometimes you avoid get to work. It a strange thing.
- Why laziness?
"No, no
- Why?
-Fearing.

I knew not explain, but last night at the extreme helplessness of the night, in the hallucinatory clarity of the night, while I was tossing and turning, I knew exactly what he meant. For fear of what you leave without writing once you get past action. "

Friday, February 4, 2011

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We all have prejudices, who is without sin that you do look. And after reading this book I to admit that my image of Dickens has changed completely.

This volume was published recently collected a series of stories that keep the common factor encountered in ghosts the excuse of the plot. The prose of Dickens, the environment and atmosphere, we move immediately to the nineteenth century and the exquisite art of writing as a craft. I have really enjoyed the beginning where I think a teacher, able to place the reader with few resources, can create an atmosphere as appealing as the children that kept us glued to a book. Needless to say, it is essential reading.

And I start talking about huge bias because my ignorance, I was trapped in the image of an innocent Dickens. He was by an author with little risk and with little to offer, but it is undeniably his charm, for something was one of the best-sellers of his time-and his ironic vision of reality, their sensitive insights to dispense the pace, the scenes, small digressions.

confront you I love Poe, and its antithesis in many ways and much more when this volume speaks of ghosts and terror on his contemporary as well elaborated. Dickens, however, approaches it from light, from the humor, insight from a man of success that the fates smiled on life. Both are great writers, but I can not help bend gently toward the American and his devastating personal reality. say they met and I think that this event is so literary as their works. I imagine the situation perfectly: Dickens man success, which travels to the U.S. to discuss with copyright piracy of their books by U.S. publishers. In short, the writer at the top. And it's easy for me to imagine Poe, as a prisoner of alcoholism and the rawness of a personal failure that must have seemed unfair to force. A face to face with them, so suggestive and that the end is so fruitless, because they were, but there was no meeting.

And finally, even one extra-literary matter, I can not get carried away by my snobbish side and admire the publication itself: the role and format make it a special book. And yes, I am of those people that when they open a book the first thing you do is tilt the nose on the pages and inhale the smell of printing. Silly as any other, right?