> -----Original Message----- > From: ffmpeg-devel <[email protected]> On Behalf Of > [email protected] > Sent: 2020年9月6日 20:29 > To: [email protected] > Cc: [email protected] > Subject: [FFmpeg-devel] [PATCH v5 2/2] > dnn_backend_native_layer_conv2d.c:Add mutithread function > > From: Xu Jun <[email protected]> > > 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:options=conv2d_threads=23 \ -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 on my 3900X 12c24t @4.2GHz > > About the increase of utime, it's because that CPU HyperThreading technology > makes logical cores twice of physical cores while cpu's counting performance > improves less than double. And utime sums all cpu's logical cores' runtime. > As a > result, using threads num near cpu's logical core's number will double utime, > while reduce rtime less than half for HyperThreading CPUs. > > Signed-off-by: Xu Jun <[email protected]> > --- > v2: add check for HAVE_PTHREAD_CANCEL and modify FATE test > dnn-layer-conv2d-test.c > v4: use extern to call dnn_native_class in dnn-layer-conv2d-test.c > v5: use DNN_SUCCESS as return flag instead of 0. > LGTM, will push tomorrow if no other comments. _______________________________________________ ffmpeg-devel mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
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