[TxMt] Re: Memory leak?
pjkim00 at gmail.com
Mon Apr 7 17:35:44 UTC 2014
>> 1) Memory usage should be in the ballpark of starting footprint (40
>> MB) + file (66 MB) = 106 MB.
> This is not possible because TM associates scopes with everything in
> your document and it also needs to create CoreText line objects to
> render the text (which is too slow to do ad-hoc so these are cached).
> It will probably need 10-20 extra bytes per character in your document,
> which turns 66 MB into ~1 GB, add in memory fragmentation and data
> structure alignment requirements, and you probably have your 1.4 GB.
> Maybe it can be improved, maybe there is the need for a special
> (limited) mode for large files, but it?s not currently a priority.
Thank you for the explanation. I really like TM2 for coding and was hoping it could be my editor for large files but it seems this was not meant to be-- will use TM for coding, vim for large files.
>> 2) After closing the window/file, memory footprint should go back to
>> near starting footprint (40 MB)
> How do you measure this? The malloc allocator does not give pages back
> to the OS (AFAIK), so once a process has increased its number of
> allocated pages, the count does not go down again.
>> 3) Closing and reopening a file should not increase memory footprint
> This might be due to fragmentation. Here one solution could be a custom
> memory allocator to keep everything related to a document allocated from
> the same memory pool, but there are still many other things I would like
> to do, before I look into such optimizations.
I measured using the memory pane of Activity Monitor.app. Regarding the malloc allocator not giving pages back, this sounds bad behavior and is an OS or C library issue that should be fixed by "them." Thank you for taking the time to respond to my email.
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