Hello,
I am interested to understand the GDDR memory bandwidth consumed by my video transcoding application in RTX 4090.
the Nsight command line to capture memory transaction metircs only shows the metrics for CUDA kernels of post processing filters.
ncu --metrics group:memory__dram_table .\ffmpeg.exe -vsync 0 -c:v h264_cuvid -i bbb_sunflower_2160p_60fps_normal.mp4 -frames 60 -f null -
ConvertNV12BLtoNV12 (15, 540, 1)x(64, 2, 1), Context 1, Stream 7, Device 0, CC 8.9
Section: Command line profiler metrics
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Metric Name Metric Unit Metric Value
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dram__bytes_read.sum Mbyte 12.54
dram__bytes_read.sum.pct_of_peak_sustained_elapsed % 83.53
dram__bytes_read.sum.per_second Gbyte/second 817.87
dram__bytes_write.sum byte 0
dram__bytes_write.sum.pct_of_peak_sustained_elapsed % 0
dram__bytes_write.sum.per_second byte/second 0
dram__sectors_read.sum sector 391,760
dram__sectors_write.sum sector 0
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Also, the nvidia-smi tool for DRAM metrics is showing no activity.
nvidia-smi.exe dmon --select=ucmt --gpm-metrics=1,2,3,10
gpu sm mem enc dec mclk pclk fb bar1 rxpci txpci gract smutil smocc dram
Idx % % % % MHz MHz MB MB MB/s MB/s GPM:% GPM:% GPM:% GPM:%
0 0 0 0 0 405 450 575 1 17 1 - - - -
0 0 0 0 0 405 270 575 1 22 16 - - - -
0 23 3 0 10 10251 2535 1283 1 3 5014 - - - -
0 25 2 0 100 10251 2775 1283 1 8 5355 - - - -
0 23 2 0 100 10251 2775 1283 1 21 5468 - - - -
0 23 2 0 100 10251 2775 1283 1 5 5471 - - - -
0 22 2 0 100 10251 2775 1283 1 10 5471 - - - -
0 21 2 0 100 10251 2775 1283 1 5 5727 - - - -
0 22 2 0 100 10251 2775 1283 1 12 5806 - - - -
0 24 2 0 100 10251 2775 1283 1 12 5471 - - - -
0 23 2 0 100 10251 2775 1283 1 11 5496 - - - -
0 23 2 0 100 10251 2775 1283 1 6 6091 - - - -
0 23 2 0 100 10251 2775 1283 1 7 5705 - - - -
0 23 2 0 100 10251 2775 1283 1 7 5866 - - - -
Can you please help on this ?
Thanks,
Raghav