Re: treesitter local parser: huge slowdown and memory usage in a long file

[Yuan Fu]

> On May 25, 2024, at 9:23 PM, Stefan Monnier via Emacs development 
> discussions. <emacs-devel@gnu.org> wrote:
> 
>> The only problem is to decide how long a history of updated ranges do we
>> keep for each parser. The 100% correct approach is to maintain a separate
>> history for each consumer, and never throw away old ranges until the
>> consumer consumes them. But then you risk wasting memory if some consumer
>> never consumes the ranges. To handle that we can add a hard limit. But then
>> this hard limit might be too low for some edge case… We can make this hard
>> limit configurable, and if we ever encountered a case where this hard limit
>> is not enough and there’s no way around it (unlikely), we can instruct users
>> or lisp program to increase it.
> 
> Side note: the above is fairly close to describing `track-changes.el`.
> [ where I don't have any hard limit, currently.  ]
> 

I see. I suppose you had to shift “modified region” around according to later 
edits, right?

Yuan