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  • 1.
    Essayas, Gebrewahid
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Yang, Mingkun
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Cedersjö, Gustav
    Department of Computer Science, Lund University, Lund, Sweden.
    Ul-Abdin, Zain
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Gaspes, Veronica
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Janneck, Jörn W.
    Department of Computer Science, Lund University, Lund, Sweden.
    Svensson, Bertil
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Realizing Efficient Execution of Dataflow Actors on Manycores2014Inngår i: Proceedings: 2014 International Conference on Embedded and Ubiquitous Computing: EUC 2014: August 2014, Milano, Italy / [ed] Randall Bilof, Los Alamitos, CA: IEEE Computer Society, 2014, s. 321-328, artikkel-id 6962305Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Embedded DSP computing is currently shifting towards manycore architectures in order to cope with the ever growing computational demands. Actor based dataflow languages are being considered as a programming model. In this paper we present a code generator for CAL, one such dataflow language. We propose to use a compilation tool with two intermediate representations. We start from a machine model of the actors that provides an ordering for testing of conditions and firing of actions. We then generate an Action Execution Intermediate Representation that is closer to a sequential imperative language like C and Java. We describe our two intermediate representations and show the feasibility and portability of our approach by compiling a CAL implementation of the Two-Dimensional Inverse Discrete Cosine Transform on a general purpose processor, on the Epiphany manycore architecture and on the Ambric massively parallel processor array. © 2014 IEEE.

  • 2.
    Yang, Mingkun
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Savas, Suleyman
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Ul-Abdin, Zain
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Nordström, Tomas
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    A Communication Library for Mapping Dataflow Applications on Manycore Architectures2013Inngår i: Proceedings of the 6th Swedish Multicore Computing Workshop / [ed] Tomas Nordstrom & Zain-ul-Abdin, 2013, s. 65-68Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Dataflow programming is a promising paradigm for high performance embedded parallel computing. When mapping a dataflow program onto a manycore architecture a key component is the library to express the communication between the actors. In this paper we present a dataflow communication library supporting the CAL actor language. A first implementation of the communication library is created for Adapteva’s manycore architecture Epiphany that contains an onchip 2-D mesh network. Three different buffering methods, with and without direct memory access (DMA) transfer, have been implemented and evaluated. We have also made a preliminary study on the effect of mapping strategies of the actors onto the cores. The assessment of the library is based on a CAL implementation of a two dimensional inverse discrete cosine transform (2D-IDCT) and our own CAL-to-C compilation framework. As expected the results show that the most efficient actor to-core mapping strategy is to keep the communication to the nearest neighbor communication pattern as much as possible. Thus, the best way to place a pipelined sequence of computations like our 2D-IDCT is to place the actors into cores in a serpentine fashion. For this application we found that the simple receiver side buffer outperforms the more complicated buffering strategies that used DMA transfer.

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