Why do I see GPU memory usage when using GStreamer for MP4 decoding on Jetson NX? Where is GPU utilized in hardware decoding?

Robotics & Edge Computing Jetson Systems Jetson TX2
1

command：
gst-launch-1.0 filesrc location=“./test.mp4” ! qtdemux ! h264parse ! nvv4l2decoder drop-frame-interval=25 ! nvvidconv ! video/x-raw ! fakesink
image

3

Hi,
Please run sudo tegrastats and check the GPU loading.

4

Thank you DaneLLL for your reply,

When I run ‘sudo tegrastats’, I observe an increase in power consumption for ‘VDD_CPU_GPU_CV’. Is this increase caused by invoking this module?

RAM 2693/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [0%@1420,0%@1420,0%@1420,0%@1420,0%@1420,0%@1420] EMC_FREQ 0%@1600 GR3D_FREQ 0%@1109 APE 150 MTS fg 0% bg 0% AO@25C GPU@25.5C PMIC@50C AUX@25C CPU@26.5C thermal@25.6C VDD_IN 3230/3235 VDD_CPU_GPU_CV 531/553 VDD_SOC 1020/1020
RAM 2693/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [0%@1420,0%@1420,0%@1420,0%@1420,0%@1420,0%@1420] EMC_FREQ 0%@1600 GR3D_FREQ 0%@1109 APE 150 MTS fg 0% bg 0% AO@24.5C GPU@25.5C PMIC@50C AUX@25C CPU@26.5C thermal@25.6C VDD_IN 3230/3235 VDD_CPU_GPU_CV 572/554 VDD_SOC 1020/1020
RAM 2697/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [0%@1420,0%@1420,5%@1420,7%@1420,0%@1420,0%@1420] EMC_FREQ 0%@1600 GR3D_FREQ 0%@1109 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 2% AO@24.5C GPU@25.5C PMIC@50C AUX@25C CPU@26.5C thermal@25.6C VDD_IN 3476/3240 VDD_CPU_GPU_CV 736/557 VDD_SOC 1020/1020
RAM 2727/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [7%@1420,1%@1420,11%@1420,12%@1420,2%@1420,2%@1420] EMC_FREQ 3%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 4% AO@25C GPU@25.5C PMIC@50C AUX@25C CPU@27C thermal@25.6C VDD_IN 4089/3256 VDD_CPU_GPU_CV 858/563 VDD_SOC 1265/1024
RAM 2727/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [12%@1420,4%@1420,7%@1420,5%@1420,5%@1420,4%@1420] EMC_FREQ 7%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 3% AO@25C GPU@25.5C PMIC@50C AUX@25C CPU@26.5C thermal@25.6C VDD_IN 4212/3273 VDD_CPU_GPU_CV 858/568 VDD_SOC 1347/1030
RAM 2727/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [15%@1420,3%@1420,5%@1420,7%@1420,4%@1420,4%@1420] EMC_FREQ 8%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 3% AO@24.5C GPU@26C PMIC@50C AUX@25C CPU@27C thermal@25.75C VDD_IN 4212/3291 VDD_CPU_GPU_CV 858/574 VDD_SOC 1347/1036
RAM 2727/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [10%@1420,4%@1420,11%@1420,7%@1420,3%@1420,3%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 3% AO@24.5C GPU@26C PMIC@50C AUX@25C CPU@27C thermal@25.9C VDD_IN 4212/3307 VDD_CPU_GPU_CV 858/579 VDD_SOC 1347/1041
RAM 2727/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [11%@1420,4%@1420,5%@1420,7%@1420,5%@1420,3%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 3% AO@25C GPU@26C PMIC@50C AUX@25C CPU@27C thermal@26.1C VDD_IN 4212/3323 VDD_CPU_GPU_CV 858/584 VDD_SOC 1347/1047
RAM 2727/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [8%@1420,3%@1420,7%@1420,6%@1420,5%@1420,3%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 61%@115 APE 150 MTS fg 0% bg 3% AO@25C GPU@25.5C PMIC@50C AUX@25C CPU@27C thermal@25.95C VDD_IN 4212/3338 VDD_CPU_GPU_CV 858/588 VDD_SOC 1347/1052
RAM 2727/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [11%@1420,2%@1420,9%@1420,7%@1420,6%@1420,3%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 3% AO@25C GPU@25.5C PMIC@50C AUX@25.5C CPU@27C thermal@25.95C VDD_IN 4212/3353 VDD_CPU_GPU_CV 858/593 VDD_SOC 1347/1057
RAM 2728/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [10%@1420,4%@1420,6%@1420,4%@1420,1%@1420,6%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 3% AO@25C GPU@25.5C PMIC@50C AUX@25.5C CPU@27C thermal@25.95C VDD_IN 4171/3367 VDD_CPU_GPU_CV 858/597 VDD_SOC 1347/1062
RAM 2728/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [10%@1420,5%@1420,7%@1420,7%@1420,3%@1420,6%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 3% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27C thermal@25.95C VDD_IN 4171/3380 VDD_CPU_GPU_CV 817/601 VDD_SOC 1347/1066
RAM 2728/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [13%@1420,2%@1420,8%@1420,8%@1420,5%@1420,4%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 2% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27C thermal@25.8C VDD_IN 4171/3393 VDD_CPU_GPU_CV 858/605 VDD_SOC 1347/1071
RAM 2728/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [10%@1420,5%@1420,6%@1420,7%@1420,3%@1420,5%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 3% AO@25C GPU@25.5C PMIC@50C AUX@25.5C CPU@27C thermal@25.95C VDD_IN 4171/3405 VDD_CPU_GPU_CV 858/609 VDD_SOC 1347/1075
RAM 2728/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [11%@1420,3%@1420,4%@1420,9%@1420,4%@1420,5%@1420] EMC_FREQ 10%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 4% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27C thermal@26.1C VDD_IN 4212/3417 VDD_CPU_GPU_CV 858/613 VDD_SOC 1347/1080
RAM 2729/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [10%@1420,2%@1420,7%@1420,3%@1420,4%@1420,4%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 3% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27C thermal@25.95C VDD_IN 4171/3429 VDD_CPU_GPU_CV 858/617 VDD_SOC 1347/1084
RAM 2729/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [11%@1420,3%@1420,11%@1420,7%@1420,6%@1420,5%@1420] EMC_FREQ 10%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 2% AO@25C GPU@25.5C PMIC@50C AUX@25.5C CPU@27C thermal@25.9C VDD_IN 4212/3441 VDD_CPU_GPU_CV 858/620 VDD_SOC 1347/1088
RAM 2729/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [10%@1420,4%@1420,5%@1420,6%@1420,2%@1420,1%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 2% AO@25C GPU@25.5C PMIC@50C AUX@25.5C CPU@27C thermal@26.1C VDD_IN 4171/3452 VDD_CPU_GPU_CV 817/623 VDD_SOC 1347/1091
RAM 2729/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [13%@1420,2%@1420,9%@1420,7%@1420,5%@1420,5%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 3% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27C thermal@26.1C VDD_IN 4171/3462 VDD_CPU_GPU_CV 817/626 VDD_SOC 1347/1095
RAM 2729/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [14%@1420,3%@1420,8%@1420,4%@1420,4%@1420,5%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 2% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27.5C thermal@26.1C VDD_IN 4171/3473 VDD_CPU_GPU_CV 817/629 VDD_SOC 1347/1099
RAM 2729/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [12%@1420,4%@1420,3%@1420,1%@1420,7%@1420,8%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 2% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27C thermal@26.25C VDD_IN 4171/3483 VDD_CPU_GPU_CV 817/632 VDD_SOC 1347/1102
RAM 2729/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [10%@1420,3%@1420,6%@1420,5%@1420,6%@1420,3%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 1%@115 APE 150 MTS fg 0% bg 2% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27C thermal@26.1C VDD_IN 4171/3492 VDD_CPU_GPU_CV 817/634 VDD_SOC 1347/1106
RAM 2729/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [12%@1420,4%@1420,6%@1420,6%@1420,5%@1420,6%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 2% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27C thermal@26.1C VDD_IN 4171/3502 VDD_CPU_GPU_CV 817/637 VDD_SOC 1347/1109
RAM 2730/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [11%@1420,4%@1420,8%@1420,9%@1420,5%@1420,4%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 2% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27C thermal@26.1C VDD_IN 4171/3511 VDD_CPU_GPU_CV 817/639 VDD_SOC 1347/1112
RAM 2730/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [7%@1420,2%@1420,5%@1420,6%@1420,1%@1420,2%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 2% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27.5C thermal@26.1C VDD_IN 4171/3520 VDD_CPU_GPU_CV 817/642 VDD_SOC 1347/1116
RAM 2730/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [9%@1420,4%@1420,7%@1420,6%@1420,5%@1420,3%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 2% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27C thermal@26.1C VDD_IN 4171/3528 VDD_CPU_GPU_CV 817/644 VDD_SOC 1347/1119
RAM 2730/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [14%@1420,3%@1420,8%@1420,6%@1420,5%@1420,2%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 2% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27C thermal@26.1C VDD_IN 4130/3536 VDD_CPU_GPU_CV 817/646 VDD_SOC 1347/1122
RAM 2730/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [12%@1420,4%@1420,5%@1420,5%@1420,2%@1420,4%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 1% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27C thermal@26.25C VDD_IN 4171/3545 VDD_CPU_GPU_CV 858/649 VDD_SOC 1347/1125
RAM 2730/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [11%@1420,3%@1420,1%@1420,1%@1420,7%@1420,3%@1420] EMC_FREQ 9%@1600 GR3D_FREQ 0%@1109 NVDEC 665 NVDEC1 665 VIC_FREQ 0%@115 APE 150 MTS fg 0% bg 2% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27C thermal@26.1C VDD_IN 4171/3553 VDD_CPU_GPU_CV 817/651 VDD_SOC 1347/1127
RAM 2693/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [1%@1420,3%@1420,0%@1420,2%@1420,1%@1420,0%@1420] EMC_FREQ 5%@1600 GR3D_FREQ 0%@1109 APE 150 MTS fg 0% bg 1% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27C thermal@26.1C VDD_IN 3394/3551 VDD_CPU_GPU_CV 613/651 VDD_SOC 1061/1127
RAM 2693/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [0%@1420,0%@1420,0%@1420,0%@1420,0%@1420,0%@1420] EMC_FREQ 2%@1600 GR3D_FREQ 0%@1109 APE 150 MTS fg 0% bg 0% AO@25.5C GPU@26C PMIC@50C AUX@25.5C CPU@27C thermal@26.1C VDD_IN 3271/3547 VDD_CPU_GPU_CV 572/650 VDD_SOC 1020/1125
RAM 2693/7773MB (lfb 188x4MB) SWAP 441/3887MB (cached 8MB) CPU [0%@1420,0%@1420,0%@1420,0%@1420,0%@1420,0%@1420] EMC_FREQ 1%@1600 GR3D_FREQ 0%@1109 APE 150 MTS fg 0% bg 0% AO@25C GPU@26C PMIC@50C AUX@25.5C CPU@27C thermal@26.1C VDD_IN 3271/3544 VDD_CPU_GPU_CV 572/649 VDD_SOC 1020/1124
5

Hi,
From tegrastats, there is 0% loading on GPU engine. So the memory usage should be mainly from hardware decoder.