Jetson TK1 performance issues

Autonomous Machines Jetson & Embedded Systems Jetson TK1
1

Hi.
I’ve been running CUBLAS matrix multiply on the TK1, and I’ve been observing some strange behaviors.

  1. When running the default size of 320x640, the performance varies from ~2.5-4.5 ms.
  2. When I turn off the desktop and just ssh in to run matrix multiply, the performance actually drops by almost 8x.
    Desktop on matrix multiply (640x1280) ~10 ms
    Desktop off matrix multiply (640x1280) ~85 ms.

Anybody have any idea why this might be happening?

Thank you.

2

The GPU clock swings from 72 to 852 MHz. I think it actually starts at 12 MHz when headless and after a reboot.

For all the reasons you can imagine the K1’s GPU isn’t immediately pegged to its maximum speed.

But for development and benchmarking purposes some unsupported overrides were revealed here.

3

Thanks!
It’s behaving much better now.
On my synthetic ubenchmark, I’m getting 308 GFLOP/s.