Finding and fixing Ghostty's largest memory leak (mitchellh.com)

Article summary

The Ghostty terminal emulator had a significant memory leak that was recently fixed. The leak was caused by a logic bug in the scrollback pruning optimization, which led to non-standard pages not being properly freed. The fix involves destroying non-standard pages during scrollback pruning and allocating a fresh standard-sized page from the pool. The fix is available in the latest nightly build and will be included in the 1.3 release in March.

Main themes

• Memory leak fix
• Terminal emulator development
• Scrollback optimization
• Bug tracking and reproduction
• Software release cycles

What commenters say

• The memory leak fix is a significant improvement, but some users are surprised it's not being released as a hotfix.
• The bug was difficult to reproduce and required a reliable reproduction to be fixed.
• Some users think the fix could be improved by reusing non-standard pages instead of destroying and recreating them.
• The use of AI for visualizations is a reasonable and efficient approach for one-time use cases.
• The decision to reserve the fix for a feature release instead of a bug fix release is questioned by some users.
• The nightly releases are the expected way to get timely bugfixes, but some users may not be aware of this.
• The impact of the bug was limited, but it was still important to fix to prevent potential issues.
• The community's feedback and discussion were helpful in identifying and fixing the issue.