Running notcurses-demo consumes a lot of memory.

[nsxz1234]

[mitchellh]

This may be just merged into #254, but I’ll take a Quick Look to see if there is anything obvious/egregious standing out i.e. if this is a leak or if this is just a situation where we aren’t resizing back down from a large scrollback or something.

Importantly, this appears to be on Linux, so things like Kitty image protocol are immediately out of the question (since it’s disabled currently on Linux due to the render work not being done). That narrows it down a bit because Ghostty really doesn’t do that much allocation beyond the screen state.

[mitchellh]

I ran this through macOS leak detector (via Instruments.app) and there is no purposeful leak it can find. One thing I did notice is that memory balloons when we're going through glyphs and I think that's because we never shrink the codepoint cache. So that's an easy win.

Another I noticed is that memory really skyrocketed during the "yields" demo but for that one I have no idea why yet.

[mitchellh]

One thing I did notice is that memory balloons when we're going through glyphs and I think that's because we never shrink the codepoint cache.

I no longer believe this to be true. I removed the cache entirely and don't see a noticeable memory difference. I also did some math and realized that even with 1,000,000 cached code points and glyphs it uses less than 30MB of RAM so this isn't it.

[mitchellh]

Actually, this doesn't reproduce at all on macOS. The screenshot below is macOS. The bottom instance is the one where I launched and ran notcurses-demo and the memory usage is very low. It does appear however that on Linux the memory usage is MUCH higher, suspicious!

[mitchellh]

Okay! I found a massive memory leak with fontconfig and fallback fonts on Linux. I don't think in a realistic environment this would cause many problems but nocturnes creates a pretty large set of font discovery queries so it's really apparent. After this, my memory usage is stable after a certain point for demo runs.