04-19-2006 03:53 PM
I find some event which is called non-standard event in the VTune, e.g. "Stall for Store Resource Buffer" event. What does "non standard" here mean? What are standard events? What is the difference between them?
04-19-2006 04:32 PM
That's an interesting question. From experience with the SBA stall cycle event selection, it exaggerates the reported stalls (maybe multiple counting), so it's more of a qualitative than a quantitative analysis. It's difficult to draw automated tuning suggestions from it. A high SBA stall rate could simply mean that you are writing out data as fast as the memory system will go (possibly limited by speed of resolution of Read For Ownership requests), or it could indicate that you are thrashing Write Combine buffers.