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VRAM: compact the texture pools; aggressive compaction as the first VRAM-pressure step #614

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opened 2026-10-10 01:15:50 +00:00 by sky_line · 1 comment

sky_line commented

2026-10-10 01:15:50 +00:00

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Background compaction: move live images out of sparsely used blocks into fuller ones and free the emptied blocks (copy + descriptor / bindless slot update, deferred frees through the existing retire path), bounded per frame.
First VRAM-pressure pre-step: when the budget manager sees pressure, before the ladder takes its first rung, run compaction much harder per frame until it is exhausted (near-zero slack). Free memory at the cost of some GPU copy / CPU work; often prevents the ladder from engaging at all.
Stats: slack before / after, MB moved per second, blocks freed, in the VKMem line.

Related: #411, #587.

Texture pool blocks strand memory: on an RTX 3070 user's machine the pools held 1992 MB of blocks for 1647 MB of live images, 345 MB slack (257 MB stranded in the medium classes, 85% occupied). That's free VRAM before anything visible has to degrade. ## Do - **Background compaction:** move live images out of sparsely used blocks into fuller ones and free the emptied blocks (copy + descriptor / bindless slot update, deferred frees through the existing retire path), bounded per frame. - **First VRAM-pressure pre-step:** when the budget manager sees pressure, before the ladder takes its first rung, run compaction much harder per frame until it is exhausted (near-zero slack). Free memory at the cost of some GPU copy / CPU work; often prevents the ladder from engaging at all. - Stats: slack before / after, MB moved per second, blocks freed, in the VKMem line. Related: #411, #587.

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2026-10-10 01:15:50 +00:00

sky_line added this to the Slipstream project

2026-10-10 01:15:50 +00:00

sky_line referenced this issue

2026-10-10 01:20:14 +00:00

VRAM (later): quantize skinned positions (16-bit per-instance box) as a pressure-only ladder rung #617

sky_line referenced this issue from a commit

2026-10-10 03:31:53 +00:00

#614 texture pool compaction + pressure pre-step before the VRAM ladder

sky_line referenced this issue from a commit

2026-10-10 03:31:53 +00:00

#614 compaction: per-pass move cap, cost-ranked blocks, release empty blocks on pressure

sky_line referenced this issue from a commit

2026-10-10 03:31:54 +00:00

#614 compaction: never move pinned textures; background hysteresis stops the churn

sky_line referenced this issue from a commit

2026-10-10 03:31:54 +00:00

#614 compaction: no background drain abort (a plan's own frees consumed the slack it measured)

sky_line referenced this issue

2026-10-10 03:37:42 +00:00

RT shadows: foliage shimmers under FSR with the half-res shadow mask; full res fixes it but costs ~1.3 GB at 4K #625

sky_line referenced this issue

2026-10-10 04:53:20 +00:00

VRAM: suballocate textures from shared blocks (~0.9 GB of 64 KiB page padding); bonus: group spatially related textures #411

sky_line referenced this issue

2026-10-10 04:53:21 +00:00

Explore: further texture memory reductions (RAM + VRAM) #263

sky_line commented

2026-10-10 05:32:58 +00:00

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Done. Texture pool compaction + pressure pre-step before the VRAM ladder (da2c366314), per-pass move cap and cost ranking (c74bee530b), pinned textures never moved and background hysteresis (382ba5e8fe), no drain abort (6e87105999). Owner verified in-session that the churn is fixed (moves ~0 at steady state). Shipped in 1.2.0 (v1.2.0, 55f4242518).

Done. Texture pool compaction + pressure pre-step before the VRAM ladder (da2c366314), per-pass move cap and cost ranking (c74bee530b), pinned textures never moved and background hysteresis (382ba5e8fe), no drain abort (6e87105999). Owner verified in-session that the churn is fixed (moves ~0 at steady state). Shipped in 1.2.0 (v1.2.0, 55f4242518).

sky_line

2026-10-10 05:32:58 +00:00

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