How to get the amount of total and available GPU(Cuda) memory?(QOpenGLFunctions)

[mandruk1331]

@Wieland Yes I know. I meant that this two variables are not being init in the function.

    QOpenGLContext context;
   context.create();

   QOffscreenSurface surface;
   surface.create();

   QOpenGLFunctions func;
   context.makeCurrent(&surface);
   func.initializeOpenGLFunctions();

   qDebug()<<func.glGetString(GL_RENDER);

qDebug prints 0x0 smth, is for sure wrong

[A Former User]

Hmm.. worked for me. Tested on Nvidia GTX 1080, 64 bit desktop Linux, with Nvidia's proprietary drivers. Don't have that machine at hand right now, can't tell for sure which driver version it has.

[mandruk1331]

@Wieland Have you tried it on Windows?? ran this code on W7 and W10 different laptops, the result was 0x0

[A Former User]

Wait, I can check with Windows 7 laptop.

[A Former User]

Okay, the code I posted above works here, too.

qDebug() << QString::fromLatin1((const char*)func.glGetString(GL_EXTENSIONS)); prints all the extentions,

qDebug() << QString::fromLatin1((const char*)func.glGetString(GL_RENDER)); prints an empty string.

[mandruk1331]

@Wieland tried the above code and it gives a list of extensions. But the main thing I need is the available GPU memory.

  QOpenGLContext context;
  context.create();
  QOffscreenSurface surface;
  surface.create();
  QOpenGLFunctions func;
  context.makeCurrent(&surface);
  func.initializeOpenGLFunctions();
  GLint cur_avail_mem_kb = 0;
  func.glGetIntegerv(GL_GPU_MEM_INFO_CURRENT_AVAILABLE_MEM_NVX,&cur_avail_mem_kb);
  qDebug()<<cur_avail_mem_kb;

cur_avail_mem_kb - is equals to the number it was initialized, in this case it's zero. What can be the problem? Does this code executes on your computer?

[A Former User]

Yes, the following prints the correct results:

GLint total_mem_kb = 0;
func.glGetIntegerv(GL_GPU_MEM_INFO_TOTAL_AVAILABLE_MEM_NVX,&total_mem_kb);
qDebug()<<total_mem_kb;

GLint cur_avail_mem_kb = 0;
func.glGetIntegerv(GL_GPU_MEM_INFO_CURRENT_AVAILABLE_MEM_NVX,&cur_avail_mem_kb);
qDebug()<<cur_avail_mem_kb;

[mandruk1331]

@Wieland A big thank you for the time you invested in solving the problem. It looks like then smth is wrong on my side, now I'm updating my drivers and after I'll give it a try again.

[A Former User]

@mandruk1331 You're welcome. Good luck, hope you can solve it. It's almost always driver-related issues.

[mandruk1331]

@Wieland Ok so I updated everything I could, but that did not solve the problem, but by asking the same question on StackOverflow, I now have a solution. The code above works ok, the main problem was that my main graphic card was Intel, therefore I had to switch the video card setting so that the main video card would be Nvidia, by doing that the problem has been solved.

[A Former User]

@mandruk1331 Hey, glad you solved it. And thanks for sharing the solution :)