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  5. Soporte del lenguaje para mejorar

10.6 Soporte del lenguaje para mejorar el rendimiento - notas

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En este capítulo, hemos cubierto algunos de los esfuerzos que se han desarrollado en el área de los lenguajes para permitir la escritura de programas para cómputo escalable. Existe una pugna entre el FORTRAN-77 puro, el FORTRAN 90, el HPF y el paso de mensajes por convertirse en la herramienta definitiva para el cómputo escalable de alto rendimiento.

Ciertamente, ha habido ejemplos de grandes éxitos tanto de FORTRAN 90 (Thinking Machines CM-5) y HPF (IBM SP y otros) como lenguajes que pueden hacer un excelente uso de los sistemas de cómputo escalables. Uno de los problemas del enfoque basado en lenguajes de alto nivel es que, en algunas ocasiones, usar un lenguaje de alto nivel abstracto en realidad reduce la transportabilidad efectiva.

Los lenguajes están diseñados para ser transportables, pero si el vendedor de su computadora escalable particular no suporte la variante de lenguaje en la que usted ha elegido escribir su aplicación, entonces no será transportable. Incluso si el vendedor tiene disponible su lenguaje, puede que no esté afinado para generar el mejor código para su arquitectura.

Una solución estriba en comprar sus compiladores de una tercer compañía, tal como Pacific Sierra o Kuck y Asociados. Estos vendedores comercializan un compilador que se ejecuto sobre un amplio rango de sistema. Para aquellos usuarios que puedan costear tales opciones, estos compiladores proporcionan un mayor nivel de transportabilidad.

Una de las preocupaciones fundamentales es el problema del huevo y la gallina. Si los usuarios no emplean un lenguaje, los vendedores no le harán mejoras. Si todos los usuarios influyentes (con todo el dinero) usan paso de mensajes, entonces la existencia de un compilador excelente de HPF no tiene ningún valor real para esos usuarios.

Las buenas noticias son que tanto FORTRAN 90 como HPF proporcionan un camino hacia el cómputo escalable transportable que no requiere paso de mensajes explícito. La única pregunta es qué camino decidirán usar los usuarios.

Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
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2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
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you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
Samuel Reply
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
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A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
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Source:  OpenStax, Cómputo de alto rendimiento. OpenStax CNX. Sep 02, 2011 Download for free at http://cnx.org/content/col11356/1.2
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