When looking into ncu --query-metrics it turns out that several counters are about this ipa pipeline that isn't even cited in NSight docs, smsp__inst_executed_pipe_ipa for example. While for all of the other pipelines a proper explanation is provided, for ipa I wasn't able to find any reference at all.
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IPA is the Interpolate Attribute pipeline used in pixel/fragment shaders to interpolate a varying attribute over a quad (4 threads). This pipeline is not accessible to a compute shader.
answered Feb 24, 2022 at 22:00
