Performance Evaluation of Kvazaar HEVC Intra Encoder on Xeon Phi Many-core Processor

Ari Koivula, Marko Viitanen, Ari Lemmetti, Jarno Vanne, Timo D. Hämäläinen

    Tutkimustuotos: Conference contributionScientificvertaisarvioitu

    13 Sitaatiot (Scopus)
    11 Lataukset (Pure)

    Abstrakti

    This paper analyzes parallel scalability and coding speed of our open-source Kvazaar HEVC intra encoder on Intel Xeon Phi 61-core coprocessor that supports up to four hardware threads per core. The evaluated parallelization schemes of Kvazaar are 1) Wavefront Parallel Processing (WPP); and 2) tiles, both accelerated with picture-level parallel processing. With WPP, the C implementation of Kvazaar high-quality preset achieves an average speedup of 1.3 and a bit rate gain of 0.7% over the respective implementation of x265. Using tiles makes Kvazaar 1.4 times faster than x265 but at a cost of 0.3% bit rate loss. When high-speed presets are used, the speedup of Kvazaar increases to 1.4 with WPP and to 1.9 with tiles. Moreover, the respective coding efficiency of Kvazaar rises to 11.2% and 10.3%. Kvazaar also scales almost linearly to the number of cores in the processor. Even if the peak coding speed of Kvazaar on Xeon Phi is lower than that on the Intel 8-core i7 processor, our parallel scalability results promise excellent speed for Kvazaar on massively parallel processors equipped with more powerful cores.
    AlkuperäiskieliEnglanti
    Otsikko2015 IEEE Global Conference on Signal and Information Processing, GlobalSIP 2015
    KustantajaIEEE
    Sivut1250-1254
    ISBN (elektroninen)978-1-4799-7590-7
    ISBN (painettu)9781479975914
    DOI - pysyväislinkit
    TilaJulkaistu - 2015
    OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
    TapahtumaIEEE GLOBAL CONFERENCE ON SIGNAL AND INFORMATION PROCESSING -
    Kesto: 1 tammikuuta 1900 → …

    Conference

    ConferenceIEEE GLOBAL CONFERENCE ON SIGNAL AND INFORMATION PROCESSING
    Ajanjakso1/01/00 → …

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