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fix(render3d): nothing allocated in the steady state - the Vulkan allocator reuses its records

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gvk_mem_new made a one-slot []pointer per allocation, and turned the requirement's size and
alignment into strings to read them as ints; gvk_list_drop_last rebuilt the spare-record list to
drop its last entry; gvk_mem_id did the string round trip on every free. One slot is kept
(gvk_map_slot), int() truncates a long, the spare list pops. Every Text.to_int(string(x)) in
render3d is int(x) now.

Vk.heap_bytes() (vk_mac.ll: malloc_zone_statistics' size_in_use; 0 on Windows) and
examples/rendering/steady.ludic, in the suite: a buffer released and made again 5000 times and
600 whole frames gain 0 bytes each - the allocator before this, 1,120,000 over the 5000.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-28 11:14:56 +03:00
parent 3915af34c2
commit 866037a0d7
9 changed files with 119 additions and 19 deletions
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changes/render3d-zero-per-frame.md Normal file
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bump: patch
type: fix
**render3d allocates nothing in its steady state.** A buffer released and made again - what a
streamed or growing buffer does every few frames - left about 224 bytes behind each time: the
Vulkan allocator made a one-slot list per allocation, turned two 64-bit sizes into strings to read
them as ints, and rebuilt its spare-record list whole to drop the last entry. It now keeps one
slot, converts with `int()`, and pops. `Vk.heap_bytes()` reads malloc's live bytes (macOS), and
`examples/rendering/steady.ludic` holds render3d to zero: 5000 buffer rounds and 600 whole frames,
0 bytes each (the unfixed allocator: 1,120,000 over the 5000).