0

Our team wishes to write a performance measuring tool with focus on GPUGPU In order to understand if a particular app is compute-bound or memory-bound we would like to track Graphic card's memory accesses without sticking to any compute API Is it possible to track syscalls like read for this purpose?

Dmitry
  • 317
  • 3
  • 10
  • `strace` would show you syscalls, but it's unclear that the actual memory access would originate in userspace and not in some kernel driver. – Chris Stratton Mar 18 '19 at 16:17
  • @Chris, it sounds like the memory accesses they want to trace aren't originating from the CPU at all, but from the graphics card. – prl Mar 18 '19 at 16:49
  • That would make syscalls rather irrelevant... at least as the direct actor, though perhaps it's possible to identify triggering interactions. My suspicious is that the asker needs to do a lot more studying of the architecture before any practical experiments. – Chris Stratton Mar 18 '19 at 17:09
  • 1
    It’s possible to trace all MMIO accesses (x86 only for now) for the given device driver. – 0andriy Mar 19 '19 at 06:36
  • @0andriy how MMIO can be traced? – Dmitry Mar 19 '19 at 11:44
  • Surprise, surprise — with *mmiotrace*. It actually had been developed to trace GPU MMIO accesses. https://elixir.bootlin.com/linux/latest/source/Documentation/trace/mmiotrace.rst – 0andriy Mar 20 '19 at 09:20

0 Answers0