Analiza zmogljivosti mobilnih spletnih brskalnikov pri izrisovanju videa

Semprimožnik, Anton (author), Lebar Bajec, Iztok (mentor)

V magistrskem delu smo analizirali in primerjali zmogljivost zaporedne in vzporedne implementacije dekodirnika videa. Za implementacijo smo uporabili jezik Javascript. Pri zaporedni implementaciji smo za dekodiranje uporabili glavno nit, medtem ko smo pri vzporedni uporabili dodatno nit. V delu smo podrobno preučili vpliv vzporednosti na razbremenitev glavne niti. Pri zaporedni implementaciji je bila glavna nit v celoti obremenjena z dekodiranjem. Pri vzporedni implementaciji smo dekodiranje izvajali na vzporedni niti, zaradi česar je bila glavna nit popolnoma razbremenjena ali obremenjena z operacijami upravljanja uporabniškega vmesnika, ki jih ne moremo izvajati vzporedno. Meritve smo izvajali v namiznih spletnih brskalnikih in v spletnih brskalnikih desetih najbolj uporabljanih mobilnih naprav. Pri tem smo poizkušali ugotoviti, kakšen vpliv ima vzporednost na hitrost dekodiranja in izrisovanje videa. Ugotovili smo, da je uporaba vzporednosti smiselna le v primerih, kadar je glavna nit močno obremenjena z operacijami za upravljanje uporabniškega vmesnika. V primeru, da z odlaganjem bremena na vzporedno nit glavno popolnoma razbremenimo, na zmogljivosti aplikacije ne pridobimo.

• Language: Slovenian
• Keywords: realno-časovna grafika, mobilni splet, zmogljivost mobilnih naprav, vzporednost
• Work type: Master's thesis/paper
• Organization: FRI - Faculty of Computer and Information Science
• Year: 2017
• PID: 20.500.12556/RUL-88884
• Publication date in RUL: 25.01.2017

Secondary language

• Language: English
• Title: Performance analysis of video rendering in mobile web browsers

Abstract

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. We 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. We 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.

• Keywords: real-time graphics, mobile web, mobile device performance, parallelism