[Lldb-commits] [lldb] [WIP] [lldb][Progress] Report progress when completing types from DWARF (PR #91452)

[Pavel Labath via lldb-commits]

labath wrote:

> > I am somewhat worried about this slowing down the actual operations it is reporting progress on. I didn't really measure this, but intuitively, I'd expect that a one of these operations (parsing/importing one type) would be pretty fast, and that the whole process takes so long simply because performing a very large number of these ops.
> > Can you get some numbers on this? E.g., the number of events (per second?) that this generates, the timings of expression evaluation with/without the patch, or something like that?
> 
> My understanding was that the progress increment is designed to be really cheap (writing two pointers) and that it's up to presentation layer to decide a t what frequency to update the UI.

Even if the actual publishing of the progress event was free, there's still appears to be quite a bit of code executed before we reach that point. For example, the "if sending progress" block in `UpdateImportProgress` is 15 lines long, it definitely looks like it can end up allocating memory, etc.

https://github.com/llvm/llvm-project/pull/91452