我注意到我的Vulkan程序在创建窗口后实际响应几乎需要10秒;经过一些测试，我把原因归结为vkCreateInstance()。
这里是有趣的部分:这个问题只发生在运行VSCode时-和如果程序正在使用验证层(VK_EXT_debug_utils)。也就是说:
程序工作在以下条件下:
- 它正在独立运行(没有VSCode)与调试utils
- 它正在独立运行(没有VSCode)没有调试utils
- 它正在VSCode中运行，没有调试utils
但是程序不工作时间:
- 它正在VSCode与调试utils运行。
(这里的"工作"是指没有任何重大延迟的运行)
I am onLinuxRadeon RX 480，使用RADV(台面)司机。
<标题>更新1看起来我在创建实例时没有使用验证层-现在我已经这样做了，并且在通过VSCode启动vkCreateInstance()时返回以下输出:
[vlk] Searching for layer manifest files
[vlk] In following folders:
[vlk] /home/jack/.config/vulkan/implicit_layer.d
[vlk] /etc/xdg/vulkan/implicit_layer.d
[vlk] /etc/vulkan/implicit_layer.d
[vlk] /home/jack/.local/share/vulkan/implicit_layer.d
[vlk] /usr/local/share/vulkan/implicit_layer.d
[vlk] /usr/share/vulkan/implicit_layer.d
[vlk] Found the following files:
[vlk] /home/jack/.local/share/vulkan/implicit_layer.d/steamfossilize_i386.json
[vlk] /home/jack/.local/share/vulkan/implicit_layer.d/steamoverlay_x86_64.json
[vlk] /home/jack/.local/share/vulkan/implicit_layer.d/steamoverlay_i386.json
[vlk] /home/jack/.local/share/vulkan/implicit_layer.d/steamfossilize_x86_64.json
[vlk] /usr/share/vulkan/implicit_layer.d/amd_icd64.json
[vlk] /usr/share/vulkan/implicit_layer.d/amd_icd32.json
[vlk] Found manifest file /home/jack/.local/share/vulkan/implicit_layer.d/steamfossilize_i386.json (file version "1.0.0")
[vlk] Found manifest file /home/jack/.local/share/vulkan/implicit_layer.d/steamoverlay_x86_64.json (file version "1.0.0")
[vlk] Found manifest file /home/jack/.local/share/vulkan/implicit_layer.d/steamoverlay_i386.json (file version "1.0.0")
[vlk] Found manifest file /home/jack/.local/share/vulkan/implicit_layer.d/steamfossilize_x86_64.json (file version "1.0.0")
[vlk] Found manifest file /usr/share/vulkan/implicit_layer.d/amd_icd64.json (file version "1.0.0")
[vlk] Found manifest file /usr/share/vulkan/implicit_layer.d/amd_icd32.json (file version "1.0.0")
[vlk] Searching for layer manifest files
[vlk] In following folders:
[vlk] /home/jack/.config/vulkan/explicit_layer.d
[vlk] /etc/xdg/vulkan/explicit_layer.d
[vlk] /etc/vulkan/explicit_layer.d
[vlk] /home/jack/.local/share/vulkan/explicit_layer.d
[vlk] /usr/local/share/vulkan/explicit_layer.d
[vlk] /usr/share/vulkan/explicit_layer.d
[vlk] Found the following files:
[vlk] /etc/vulkan/explicit_layer.d/VkLayer_screenshot.json
[vlk] /etc/vulkan/explicit_layer.d/VkLayer_monitor.json
[vlk] /etc/vulkan/explicit_layer.d/VkLayer_api_dump.json
[vlk] /etc/vulkan/explicit_layer.d/VkLayer_device_simulation.json
[vlk] /usr/share/vulkan/explicit_layer.d/VkLayer_khronos_validation.json
[vlk] Found manifest file /etc/vulkan/explicit_layer.d/VkLayer_screenshot.json (file version "1.2.0")
[vlk] Found manifest file /etc/vulkan/explicit_layer.d/VkLayer_monitor.json (file version "1.0.0")
[vlk] Found manifest file /etc/vulkan/explicit_layer.d/VkLayer_api_dump.json (file version "1.2.0")
[vlk] Found manifest file /etc/vulkan/explicit_layer.d/VkLayer_device_simulation.json (file version "1.2.0")
[vlk] Found manifest file /usr/share/vulkan/explicit_layer.d/VkLayer_khronos_validation.json (file version "1.2.0")
[vlk] Searching for driver manifest files
[vlk] In following folders:
[vlk] /usr/share/vulkan/icd.d/radeon_icd.x86_64.json
[vlk] Found the following files:
[vlk] /usr/share/vulkan/icd.d/radeon_icd.x86_64.json
[vlk] Found ICD manifest file /usr/share/vulkan/icd.d/radeon_icd.x86_64.json, version "1.0.0"
[vlk] Searching for ICD drivers named /usr/lib/libvulkan_radeon.so
[vlk] Build ICD instance extension list
[vlk] Loading layer library libVkLayer_khronos_validation.so
[vlk] Insert instance layer VK_LAYER_KHRONOS_validation (libVkLayer_khronos_validation.so)
[vlk] /usr/lib32/amdvlk32.so: wrong ELF class: ELFCLASS32
[vlk] Loading layer library /usr/lib/amdvlk64.so
[vlk] Insert instance layer VK_LAYER_AMD_switchable_graphics_64 (/usr/lib/amdvlk64.so)
[vlk] Requested layer VK_LAYER_AMD_switchable_graphics_32 was wrong bit-type.
[vlk] Build ICD instance extension list
在Visual Studio Code之外的输出日志是一样的。
在深入研究了这个问题之后，我发现了一个解决方法，虽然它不能完全消除延迟，但可以将其最小化到几乎即时。大约8-9秒减少到平均大约2-3秒。虽然不完美，但比以前好了很多。
结果是GDB不管出于什么原因，导致了这次延误。也许GDB或Vulkan团队的人应该调查一下?我不知道。在任何情况下，VSCode都使用GDB来调试程序。
所以要解决这个问题:使用LLDB代替。幸运的是，我不限于出于任何原因使用GDB, LLDB似乎也是一个非常好的调试器。可能还有其他我不知道的人做得更好……在将来的某个时候，我将进一步研究它。
在我的情况下，因为我使用VSCode，这个扩展是有用的集成LLDB到启动。