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We decided not to use this model mainly because the amount of memory required to store the instrumentation metrics per shader or pipeline is not fixed; it can vary based on the number of shaders in a pipeline or the number of basic blocks in the shader.",{"type":1873,"tag":1874,"props":1941,"children":1942},{},[1943],{"type":1878,"value":1944},"Capturing metrics directly into a user-specified buffer was also considered. 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vkClearShaderInstrumentationMetricsARM",{"type":1873,"tag":2274,"props":3460,"children":3461},{"style":2291},[3462],{"type":1878,"value":2520},{"type":1873,"tag":2274,"props":3464,"children":3465},{"class":2276,"line":14},[3466,3470,3474],{"type":1873,"tag":2274,"props":3467,"children":3468},{"style":2291},[3469],{"type":1878,"value":2528},{"type":1873,"tag":2274,"props":3471,"children":3472},{"style":2531},[3473],{"type":1878,"value":266},{"type":1873,"tag":2274,"props":3475,"children":3476},{"style":2291},[3477],{"type":1878,"value":2538},{"type":1873,"tag":2274,"props":3479,"children":3480},{"class":2276,"line":18},[3481,3485,3489],{"type":1873,"tag":2274,"props":3482,"children":3483},{"style":2291},[3484],{"type":1878,"value":2659},{"type":1873,"tag":2274,"props":3486,"children":3487},{"style":2531},[3488],{"type":1878,"value":2664},{"type":1873,"tag":2274,"props":3490,"children":3491},{"style":2291},[3492],{"type":1878,"value":2612},{"type":1873,"tag":1874,"props":3494,"children":3495},{},[3496,3498,3503],{"type":1878,"value":3497},"This is a host side command as the assumption is that this only gets called once previous results have been retrieved via ",{"type":1873,"tag":2003,"props":3499,"children":3501},{"className":3500},[],[3502],{"type":1878,"value":3177},{"type":1878,"value":3504},", which is already a host side command.",{"type":1873,"tag":1880,"props":3506,"children":3508},{"id":3507},"_examples",[3509],{"type":1878,"value":3510},"Examples",{"type":1873,"tag":2263,"props":3512,"children":3514},{"className":2265,"code":3513,"language":2267,"meta":2268,"style":2268},"compute_pipeline_create_info.flags = VK_PIPELINE_CREATE_2_INSTRUMENT_SHADERS_BIT_ARM;\n\n/* Create a pipeline with the flag enabled. */\nvkCreateComputePipelines(compute_pipeline_create_info);\n\n\nVkShaderInstrumentationCreateInfoARM create_info = {\n  VK_STRUCTURE_TYPE_SHADER_INSTRUMENTATION_CREATE_INFO_ARM, /* sType */\n  nullptr                                                   /* pNext */\n};\n\nVkShaderInstrumentationARM instrumentation = {};\nvkCreateShaderInstrumentationARM(\n     device,                            /* device */\n     create_info,                       /* createInfo */\n     nullptr,                           /* pAllocator */\n     &instrumentation                   /* pInstrumentation */\n);\n\nvkBeginCommandBuffer(cmd_buf, &cmd_buf_begin_info);\n\n/* ... */\n\n/* Bind resources and the compute pipeline (with instrumentation) */\n\nvkCmdBeginShaderInstrumentationARM(\n      cmd_buf,                           /* commandBuffer */\n      instrumentation                    /* instrumentation */\n);\n\n/* this dispatch will have the following header: resultIndex=0, shaderStage=compute, resultSubIndex=0 */\nvkCmdDispatch(cmd_buf, 128, 2, 1);\n\nvkCmdEndShaderInstrumentationARM(\n      cmd_buf                            /* commandBuffer */\n);\n\n/* ... */\n\nvkCmdBeginShaderInstrumentationARM(\n      cmd_buf,                           /* commandBuffer */\n      instrumentation                    /* 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completion */\n\n/* Read out the counters.\n\n/* Get the descriptions for the counters: */\nVkShaderInstrumentationMetricDescriptionARM *descriptions = malloc(numMetrics * sizeof(VkShaderInstrumentationMetricDescriptionARM));\n\n/* note that this entry point requires pDescriptions to have space for numMetrics */\n\nvkEnumeratePhysicalDeviceShaderInstrumentationMetricsARM(\n  physical_device,          /* physicalDevice */\n  &numMetrics,              /* the number of descriptions to retrieve */\n  descriptions              /* pDescriptions */\n);\n\n/* Assume numMetrics == 6. The resulting array may have the following structure:\n *\n   {{ \"fma\", \"Fused multiply accumulate operations\" },\n    { \"cvt\", \"Arithmetic convert operations\" },\n    { \"sfu\", \"Special functions operations\" },\n    { \"ls\",  \"Load/store operations\"  },\n    { \"tex\", \"Texture operations\" },\n    { \"var\", \"Varying operations\" },\n   }\n*/\n\nuint32_t total_basic_block_count;\n\n/* Get the number of basic blocks associated with the instrumentation object. */\nvkGetShaderInstrumentationValuesARM(\n     device,                            /* device */\n     instrumentation,                   /* instrumentation */\n     &total_basic_block_count,          /* pMetricBlockCount */\n     nullptr,                           /* pMetricValues */\n     0                                  /* flags */\n);\n\nuint32_t stride = sizeof(VkShaderInstrumentationMetricDataHeaderARM) + sizeof(uint64_t) * numMetrics;\nvoid *metrics = malloc(stride * total_basic_block_count);\n\n/* Read out the metrics */\nVkResult result = vkGetShaderInstrumentationValuesARM(\n     device,                            /* device */\n     instrumentation,                   /* instrumentation */\n     &total_basic_block_count,          /* pMetricBlockCount */\n     metrics,                           /* pMetricValues */\n     0                                  /* flags */\n);\n\n/* NOTE:\n * If total_basic_block_count is smaller than the value returned by the\n * implementation, the implementation will not write beyond\n * stride * total_basic_block_count.\n *\n * The intended usage is to read all available entries, so there is no\n * mechanism to randomly access a specific metric index.\n */\n\nif (result == VK_INCOMPLETE)\n{\n  /* The output data will be truncated as the allocated memory was not big enough. */\n}\n\n/* At this point, all the counters should be contained within the metrics array.\n * Each block of data in the array is structured as:\n * {resultIndex, resultSubIndex, shaderStage, basicBlockIndex, fma, cvt, sfu, ls, tex, var}\n * The name/description of the metric can be looked up by searching for the matching index in the\n * descriptions array.\n * The array is sorted by resultIndex/shaderStage/resultSubIndex/basicBlockIndex in that order. 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