October 2024
Intermediate to advanced
270 pages
8h 13m
Spanish
Content preview from 97 cosas que todo programador Java debe saber
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Capítulo 6. La evaluación comparativa es difícil: JMH te ayuda
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Michael Hambre
La evaluación comparativa en la JVM, especialmente la microevaluación comparativa, es difícil. No basta con lanzar una medición de nanosegundos alrededor de una llamada o bucle y ya está. Tienes que tener en cuenta el calentamiento, la compilación HotSpot, las optimizaciones de código como el inlining y la eliminación de código muerto, el multihilo, la coherencia de la medición y mucho más.
Afortunadamente, Aleksey Shipilëv, autor de muchas grandes herramientas JVM de , aportó JMH, el arnés de microcomprobación de Java, al OpenJDK. Consiste en una pequeña biblioteca y un complemento del sistema de compilación. La biblioteca proporciona anotaciones y utilidades para declarar tus puntos de referencia como clases y métodos Java anotados, incluida una clase BlackHole para consumir valores generados y evitar la eliminación de código. La biblioteca también ofrece un correcto manejo del estado en presencia de multihilo.
El complemento del sistema de compilación genera un JAR con el código de infraestructura pertinente para ejecutar y medir correctamente las pruebas. Esto incluye fases de calentamiento específicas, multihilo adecuado, ejecución de varias bifurcaciones y cálculo de la media entre ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.