VisualVM is a visual tool integrating several commandline JDK tools and lightweight profiling capabilities. Designed for both production and development time use, it further enhances the capability of monitoring and performance analysis for the Java SE platform.
Currently adding a column to a table with a non-NULL default results in
a rewrite of the table. For large tables this can be both expensive and
disruptive. This patch removes the need for the rewrite as long as the
default value is not volatile. The default expression is evaluated at
the time of the ALTER TABLE and the result stored in a new column
(attmissingval) in pg_attribute, and a new column (atthasmissing) is set
to true. Any existing row when fetched will be supplied with the
attmissingval. New rows will have the supplied value or the default and
so will never need the attmissingval.
Thanks to mobile device and network proliferation, more people are using the web than ever before. As this user base grows, performance is more important than ever. In this article, find out why performance matters, and learn what you can do to make the web faster for everyone.
Researchers and educators have developed computer-based tools, such as automated writing evaluation (AWE) systems, to increase opportunities for students to produce natural language responses in a variety of contexts and subsequently to alleviate some of the pressures facing writing instructors due to growing class sizes
Website Performance ist ein sehr weitläufiges Thema und erstreckt sich über nahezu alle Aspekte der Webentwicklung. So ist es auf der Serverseite möglich, mit cleverem Caching von dynamisch generiertem Markup, dem Optimieren und Reduzieren von Datenbankabfragen und dem Setzen der wichtigen Expires und Cache-Control Header sehr schnell möglich, einen hohen Grad an Performance zu erreichen. Auf der Clientseite hingegen finden sehr häufig die meisten Geschwindigkeitsverluste statt.
A website speed test tool to compare uBlock Origin with plain Chrome. Check the weight of your ad implementation. Please consider the environment before loading a bunch of ads on your website.
Thousands of students and teachers across Wales will benefit from cutting-edge data analytics technology to improve student engagement, retention and performance as a result of a funding boost to be announced today by the Higher Education Funding Council for Wales (HEFCW) and Jisc.
This post takes a look at the speed - latency and throughput - of various subsystems in a modern commodity PC, an Intel Core 2 Duo at 3.0GHz. I hope to give a feel for the relative speed of each component and a cheatsheet for back-of-the-envelope performance calculations. I’ve tried to show real-world throughputs (the sources are posted as a comment) rather than theoretical maximums. Time units are nanoseconds (ns, 10-9 seconds), milliseconds (ms, 10-3 seconds), and seconds (s). Throughput units are in megabytes and gigabytes per second. Let’s start with CPU and memory, the north of the northbridge:
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Genetic and evolutionary computation, 2, Seite 1760--1760. London, ACM Press, (7-11 July 2007)
R. Attar, V. Prabhu, M. Glueck, und A. Khan. Proceedings of the 2010 Spring Simulation
Multiconference, Seite 177:1--177:4. San Diego, CA, USA, Society for Computer Simulation International, (2010)