Introducing the Qt WebEngine-blink

Qt团队经过研究和评估,决定将Chromium作为未来Web引擎的基础,因为Chromium具备跨平台特性、丰富的功能、高质量的开发、优秀的性能以及快速的发展速度。这一选择简化了操作系统的集成工作,提供了更好的API和更无缝的Qt整合。

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http://blog.qt.digia.com/blog/2013/09/12/introducing-the-qt-webengine/

http://qt-project.org/wiki/QtWebEngine

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After spending some time researching and looking at both alternatives, we have now come to the conclusion, that we will base our future Web engine on Chromium. The Qt WebEngine. There are many reasons that lead to this decision:

  • Chromium has a cross-platform focus, with the browser being available on all major desktop platforms and Android. The same is no longer true of WebKit, and we would have had to support all the OS’es on our own in that project.
  • There are many things that are available out-of-the box from Chromium, which would require a lot of work for us to support ourselves in WebKit. One example, is the whole platform/OS adaptation that we can simply re-use. Multimedia and new HTML5 features such as WebRTC are working out-of the-box and don’t require any Qt-specific code.
  • As using Chromium simplifies handling the OS integration, this allows us to spend additional time to focus on the upper layers to provide a great and easy-to-use API and a seamless integration into Qt as possible.
  • We are seeing that Chromium is being developed with very strict control on quality. This simplifies our testing efforts and will allow us to provide a more stable and higher quality Web engine.
  • Chromium will allow us to do a better and more performant integration with both widgets and the Qt Quick scene graph than we would be able to do with WebKit
Finally, we are seeing that Chromium is currently by far the most dynamic and fastest moving browser available. Basing our next-generation Web engine on Chromium is a strategic and long-term decision. 
Linux block IO(块输入输出)是Linux操作系统的IO子系统,用于管理块设备(例如硬盘和SSD)的访问。在多核系统上引入多队列SSD访问是一种优化措施。 传统上,Linux操作系统在处理块设备访问时,使用单个队列(queue)来处理所有IO请求。这种单队列设计对于单核系统来说是合适的,因为只有一个CPU核心可以处理IO请求。然而,在多核系统中,这种设计却成为了性能瓶颈,因为所有的IO请求都必须经过单个队列,即使有多个CPU核心是可用的。 为了解决这个问题,Linux引入了多队列SSD访问功能。这意味着在多核系统上,每个CPU核心都有一个独立的队列来处理IO请求。每个队列可以独立处理IO请求,而不会受到其他队列的干扰。这种设计可以提高系统的并发性和吞吐量。 多队列SSD访问还可以充分利用SSD设备的性能特点。SSD设备通常具有多个通道(channel)和多个闪存芯片(chip),每个通道和芯片都可以同时处理IO请求。通过将IO请求分配给多个队列,可以同时利用多个通道和芯片,从而提高SSD的性能。 在Linux中实现多队列SSD访问需要对内核进行相应的修改和配置。用户可以通过命令和配置文件来设置每个队列的属性和参数,以满足特定场景下的需求。 总之,通过引入多队列SSD访问,Linux在多核系统上可以更好地利用硬件资源,提高系统的性能和吞吐量。这是一个重要的优化措施,可以提高块设备访问的效率和响应速度。
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