Jetson Xavier

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hii,
I am running an application on Jetson xavier board, I get different computation time in each iteration(decreases) if I put the application in a loop, I have several kernels in the application including fft kernel whose timing also changes with every iteration.
Any idea why that is happening?

6

Hi,

Please make sure you have locked the processor clocks.
Or the performance will vary due to the dynamic clock mode.

More, the first launch will take a little bit longer for GPU initialization.

Thanks.

7

Hi, AastaLL
How do I lock the processor clocks on remote jetson board?

8

Hi,

You can use our default tool and script to maximize the device performance:

$ sudo nvpmodel -m 0 
$ sudo jetson_clocks

Thanks.

9

Hi AastaLLL,
I tried the commands you mentioned, now the timings are in control, Could you please explain what these commands do?

Thanks

10

There is a table in the kernel of allowed clock ranges and whether to enable or disable cores. The nvpmodel -m 0 uses the table which contains the maximum range of clocks and all cores (more or less). The jetson_clocks command pegs the clocks to the maximum of that model. If you were using different models, then jetson_clocks would still maximize performance within that model, but the model itself might limit to a lower performance profile.

If those commands helped, then it tends to imply that some sort of energy savings was limiting performance.