In this thesis we analyzed and compared the performance of a single threaded and a parallel video decoder both implemented in Javascript language. In the single threaded implementation we use the main thread to decode a video. In the parallel version we use an additional thread.ududWe analyzed the effect of parallelism on the main thread's performance. In the single threaded implementation the main thread was fully utilized with video decoding. In the parallel version we were decoding the video on an additional parallel thread with the main thread empty or partially utilized with user interface tasks that cannot be executed in parallel. We measured the performance in desktop web browsers and on the ten most common mobile devices on the market. We evaluated the effect of parallelism on the decoding and rendering speed.ududWe show that parallelism improves performance when the main thread executes heavy tasks related to the user interface. In the case when the main thread's load is fully offloaded to the parallel thread the performance does not improve.
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机译：在本文中，我们分析并比较了均使用Javascript语言实现的单线程和并行视频解码器的性能。在单线程实现中，我们使用主线程对视频进行解码。在并行版本中，我们使用了另一个线程。 ud ud我们分析了并行性对主线程性能的影响。在单线程实现中，主线程与视频解码完全结合使用。在并行版本中，我们在一个附加的并行线程上对视频进行解码，而主线程为空或部分与无法并行执行的用户界面任务一起使用。我们测量了桌面Web浏览器和市场上十种最常见的移动设备上的性能。我们评估了并行性对解码和渲染速度的影响。 ud ud我们证明了当主线程执行与用户界面相关的繁重任务时，并行性可提高性能。如果主线程的负载完全卸载到并行线程上，则性能不会提高。
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