On 31/08/2020 18:03, xuju...@sjtu.edu.cn wrote:
From: Xu Jun <xuju...@sjtu.edu.cn>
Use pthread to multithread dnn_execute_layer_conv2d.
Can be tested with command "./ffmpeg_g -i input.png -vf \
format=yuvj420p,dnn_processing=dnn_backend=native:model= \
espcn.model:input=x:output=y -y sr_native.jpg -benchmark"
before patch: utime=11.238s stime=0.005s rtime=11.248s
after patch: utime=20.817s stime=0.047s rtime=1.051s
Can you explain why it uses almost twice as much total CPU time after the
patch? That seems rather more than can be explained away as scheduling
overhead.
If it's actually doing significantly more then maybe you want to document
somewhere that enabling threading will improve latency at the cost of
throughput.
- Mark
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