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Report live bytes as well as line usage, and size the heap from live bytes #83
Description
Immix counts a whole 128-byte line as used when any live object touches it, and the next collection target is computed from those line bytes, so fragmentation and the 100% target free space compound and a process can hold about twice its live data. Exposing live bytes next to line bytes (a MEM_INFO_* value) would make this measurable, and basing the target on live bytes would shrink it.
Activity
dimensionscape commentedon Oct 19, 2026
Status: can be done entirely in libhxcpp; no Haxe change needed.
The
MEM_INFO_*values come from the runtime's enum insrc/hx/gc/Immix.cpp(around line 267). Haxe'sstd/cpp/vm/Gc.hxonly gives names to 0 to 3 as plain constants. A new value for live bytes works throughGc.memInfo64(<value>)straight away; a named constant in Haxe's std would be nice to have, not required.Note for the second half: sizing the heap from live bytes changes when collections happen, so for a 6.x release it should be opt-in (a define) or come with measurements.
Report live bytes next to line usage