Shirley> My observation is the atomic operation is not that
Shirley> expensive.
It's just about the worst thing to do. For example, on x86/x86-64 an
instruction with the lock; prefix is quite slow. If you look at an
instruction level profile you can see that quite clearly.
Shirley> I thought the path holding another AH reference to
Shirley> prevent it to be freed?
If that were true then why would we want to reference count sends at
all? The whole point is that a path might be destroyed before the
send is executed.
- R.
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