[Question] Shared and Host Buffers can offer the same overall performance on Intel Integrated Graphics?

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cpp
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performance

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从所链接的 codeBlogArticles repository 中的 sharedMemoryEffect 应用开始，将其 host-buffer 和 shared-buffer 运行结果与博客中报告的结果进行比较。该 issue 没有指定需要修改的 Level Zero 源文件或测试；完成这项工作需要复现 memory-bound 和 compute-bound 情况，并确定在 Intel 集成显卡上的观测性能是否符合预期。

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描述

I am interested in analyzing the overall performance (end-to-end applications) when using different types of buffer allocation. I wrote this blog-entry for reference:

https://jjfumero.github.io/posts/2022/05/overall-performance-of-unified-shared-memory-level-zero/

What I saw was that running an application with host buffers offers the same performance as running with shared memory buffers. My understanding is that, when running applications using shared memory buffers, the GPU driver can migrate the buffers from the host to the device, while host memory will be accessed from the device every time a data item is required. I have two scenarios: a) memory-bound and b) compute-bound. I was surprised to see that, when running the memory-bound case, the overall performance was very similar when allocating buffers using host memory only, and shared memory only. Is this performance expected when running on Intel Integrated graphics?

If you want to reproduce all numbers, the whole application is available here: https://github.com/jjfumero/codeBlogArticles/tree/master/may2022/sharedMemoryEffect

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