ARB_sparse_texture crashing, causing computer to reboot

Question

I'm using ARB_sparse_texture OpenGL extension in a visualisation project. I'm getting random exception on glTexturePageCommitmentEXT call. Its causing computer to reboot when i run my application in NVidia Mosaic Mode.

I'm calling glTexturePageCommitmentEXT like this :

glTexturePageCommitmentEXT( textureId, level, 0, 0, layer, width, height, 1, false );

Where textureId points to a sparse texture generated with :

const PageSizeT & pageSize  = pageSizes( internalFormat );
pageSizeX   = pageSize.x[pageSizeIndex_];
pageSizeY   = pageSize.y[pageSizeIndex_];
pageSizeZ   = pageSize.z[pageSizeIndex_];

glGenTextures( 1, &id );
glBindTexture( GL_TEXTURE_2D_ARRAY, id );

glTexParameteri( GL_TEXTURE_2D_ARRAY, GL_TEXTURE_SPARSE_ARB, GL_TRUE );
glTexParameteri( GL_TEXTURE_2D_ARRAY, GL_VIRTUAL_PAGE_SIZE_INDEX_ARB, pageSizeIndex_ );

glTexParameteri( GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );
glTexParameteri( GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR );

glTexParameteri( GL_TEXTURE_2D_ARRAY, GL_TEXTURE_BASE_LEVEL, 0 );

glTexStorage3D( GL_TEXTURE_2D_ARRAY, levels, internalFormat, width, height, layers );

handle = glGetTextureHandleARB( id );

glMakeTextureHandleResidentARB( handle );

glBindTexture( GL_TEXTURE_2D_ARRAY, 0 );

level is mipmapping level, 0 and 0 x and y offsets, layer is index of a slice in GL_TEXTURE_2D_ARRAY, width and height is texture size in mipmap level

std::max( (int)textureWidth_ >> level_, 1 )

and 1 is depth. Last parameter (false) is where i ask extension to uncommit given texture area. To commit texture specific area i have a similar call to this function with last parameter set true.

glTexturePageCommitmentEXT( textureId, level, 0, 0, layer, width, height, 1, false );

• I have 12 screens running in NVidia Mosaic mode.
• I have 3 NVidia Quadro M6000 installed on my computer.

• I have a fragment shader to tell application which portion/mipmap level of this texture is visible :

  layout( std430, binding = 4 ) buffer TexUsage { uint texUsage[]; //[ layer{level, level, level..}... ] };

  atomicAdd( texUsage[layer * levelCount + int( textureQueryLod( tex, texCoord.xy ).y )], 1 );

• Each frame when i find a mipmap level of a layer is visible i commit that with above steps and i create a Framebuffer :

  glGenFramebuffers( 1, &id );

  glBindFramebuffer( GL_FRAMEBUFFER, id ); glFramebufferTextureLayer( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, textureId, level, layer );

  // Do some drawing

  glBindFramebuffer( GL_FRAMEBUFFER, 0 );

• Or if i found a mipmap level of a layer is not visible any more i uncommit it with the code above.

• After i have this random crashes i tried :

  • Using smaller textures 256x256x100 => Crashed.
  • Not using sparse textures => I had no crashes.
  • Tried to isolate problem with removing mipmap levels (by setting levels to 1) => didn't helped.
  • Tried disabling Mosaic Mode and forcing 1 GPU to do the work instead of three GPUs => Some what better, at least i got an exception for glTexturePageCommitmentEXT(..., false) call. But still have random crash.

My questions :

• How can i resolve this issue?
• What is happening?
• Why i don't get any glError?
• Why it can only throw exception only when 1 GPU is active (Mosaic is disabled)?
• How this can cause computer to reboot and how i can i prevent it?
• I see NVidia driver has option to "Optimize Sparse Texturing" and its turned on. What is this setting doing? Any Experience?
• Any suggestion to improve this whole thing?