Changes between Version 16 and Version 17 of user_applications


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Timestamp:
Nov 29, 2015, 12:28:28 PM (10 years ago)
Author:
alain
Comment:

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  • user_applications

    v16 v17  
    138138The source code can be found [source:soft/giet_vm/applications/classif/classif.c here], and the mapping is defined [source:soft/giet_vm/applications/classif/classif.py here].
    139139
     140== __mjpeg__ ==
     141
     142This multi-threaded application makes the decompression of a MJPEG bit-stream contained in a file, an display the stream of images on the Frame Buffer.
     143It illustrates the "multi pipe-line" parallelism. It uses the message passing programming model, on top of the POSIX threads API, and the MWMR communication middleware.
     144The application is described as a TCG (Task and Communication Graph), and all communications between threads uses MWMR channels.
     145Each pipeline decompress one complete image, and there is one pipe-line per cluster.
     146It uses the chained buffer DMA component to display the stream of decompressed images.ç!!l:=m
     147It contains 6 types of threads (plus the "main" thread, that makes initialisation), and 7 types of MWMR communication channels:
     148 * the TG thread dispatch the bit-stream to the pipeline. It is only mapped in cluster[0,0].
     149 * the 5 threads implementing the pipeline (DEMUX, VLD, IQZZ, IDCT, LIBU) are replicated in all clusters.
     150 * the 7 MWMR channels are replicated in all clusters.
     151The image throughput is actually bounded by the TG task that cannot be parallelized.
     152
     153The hardware constraints are the following
     154 * The number of clusters cannot be larger than 16*16.
     155 * The number of processors per cluster cannot be larger than 4.
     156 * The frame buffer size must fit the decompressed images size.
     157 * It uses one TTY terminal shared by all tasks.
     158
     159All parameters (number of images, depths of communication channels, debug variables) are defined in the [source:soft/giet_vm/applications/mjpeg/mjpeg.h mjpeg.h] file.
     160
     161The source code can be found [source:soft/giet_vm/applications/mjpeg/mjpeg.c here], and the mapping is defined [source:soft/giet_vm/applications/mjpeg/mjpeg.py here].
     162
    140163== __raycast__ ==
    141164
    … …  
    172195
    173196The source code can be found [source:soft/giet_vm/applications/router/router.c here], and the mapping is defined [source:soft/giet_vm/applications/router/router.py here].
    174 
    175 == __mjpeg__ ==
    176 
    177 This multi-threaded application makes the decompression of a MJPEG bit-stream contained in a file, an display the stream of images on the Frame Buffer.
    178 It illustrates the "multi pipe-line" parallelism. It uses the message passing programming model, on top of the POSIX threads API, and the MWMR communication middleware.
    179 The application is described as a TCG (Task and Communication Graph), and all communications between threads uses MWMR channels.
    180 Each pipeline decompress one complete image, and there is one pipe-line per cluster.
    181 It uses the chained buffer DMA component to display the stream of decompressed images.ç!!l:=m
    182 It contains 6 types of threads (plus the "main" thread, that makes initialisation), and 7 types of MWMR communication channels:
    183  * the TG thread dispatch the bit-stream to the pipeline. It is only mapped in cluster[0,0].
    184  * the 5 threads implementing the pipeline (DEMUX, VLD, IQZZ, IDCT, LIBU) are replicated in all clusters.
    185  * the 7 MWMR channels are replicated in all clusters.
    186 The image throughput is actually bounded by the TG task that cannot be parallelized.
    187 
    188 The hardware constraints are the following
    189  * The number of clusters cannot be larger than 16*16.
    190  * The number of processors per cluster is not constrained.
    191  * The frame buffer size must fit the decompressed images size.
    192  * It uses one TTY terminal shared by all tasks.
    193 
    194 All parameters (number of images, depths of communication channels, debug variables) are defined in the [source:soft/giet_vm/applications/mjpeg/mjpeg.h mjpeg.h] file.
    195 
    196 The source code can be found [source:soft/giet_vm/applications/mjpeg/mjpeg.c here], and the mapping is defined [source:soft/giet_vm/applications/mjpeg/mjpeg.py here].