On 02/05/2018 09:58 PM, John Hening wrote: > 1. Why do you find it is a bug in tierred compilation machinery? It is not on > my eye. The > compilation level is: C2, level 4
Wait a minute, where exactly does it say "C2, level 4" for you? I am saying the disassembly you have provided in the original message is probably level 2/3, and if it is hot, that might be a bug in tiered compilation machinery: we are not supposed to spend a lot of time in methods with profiling enabled. But you haven't verified that disassembly is actually on the hot path. Level 4 code would be on hotpath, and it would be without profiling. > 2. I have still a doubt: why profiling counter is not synchronized. What if 2 > or more threads > executing a function That is a race, so profile is not very accurate. We (mostly) do not care about that: there is a tradeoff between profiling overhead and profile accuracy. (Yes, I know racy updates are quirky and potentially lose the unbounded number of updates). -Aleksey -- You received this message because you are subscribed to the Google Groups "mechanical-sympathy" group. To unsubscribe from this group and stop receiving emails from it, send an email to mechanical-sympathy+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
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