sky_line/Slipstream

Fork 1

Frame stalls during buffer growth / region changes: no long full-GPU waits on the main thread #699

New issue

Closed

opened 2026-10-12 06:11:42 +00:00 by sky_line · 1 comment

sky_line commented

2026-10-12 06:11:42 +00:00

Owner

Scope

Replace full waits with deferred retirement (retire old buffers after their frame fences, copy on the GPU timeline).
Spread region retirement / cache serialization over frames.
Pipeline compile retries off the main thread; a pipeline that failed under pressure is retried later instead of disabled for the session.
Log any main-thread wait over a threshold with its site (see the diagnostics ticket).

Several growth/shrink paths wait for the whole GPU (device idle / fence waits) on the main thread: geometry buffer rebuilds, rigged buffer regrowth (several waits in one call), temporal / probe target re-creates, VRAM ladder rungs that rebuild targets, and synchronous pipeline-compile retries (~3.5 s each). Under memory pressure (Windows paging) these can stretch long enough to cause a region disconnect, and they tend to cluster during region changes. **Scope** - Replace full waits with deferred retirement (retire old buffers after their frame fences, copy on the GPU timeline). - Spread region retirement / cache serialization over frames. - Pipeline compile retries off the main thread; a pipeline that failed under pressure is retried later instead of disabled for the session. - Log any main-thread wait over a threshold with its site (see the diagnostics ticket).

sky_line added the

status

in-progress

label

2026-10-12 06:11:42 +00:00

sky_line added this to the Slipstream project

2026-10-12 06:11:42 +00:00

sky_line referenced this issue from a commit

2026-10-12 12:33:14 +00:00

#699: GPU wait accounting per call site + redundant device-idle elision; #697 low-memory counters

sky_line referenced this issue from a commit

2026-10-12 12:33:14 +00:00

#697: upload staging is soft; refused streams retry next frame

sky_line referenced this issue from a commit

2026-10-12 12:33:14 +00:00

#697: occlusion / Hi-Z, particle emitters, skin cache, alpha-sort keys, anim buffers grow softly

sky_line referenced this issue from a commit

2026-10-12 12:33:14 +00:00

#699: no multi-second synchronous pipeline retry ladder on the render thread in world

sky_line commented

2026-10-14 06:33:44 +00:00

Author

Owner

Shipped in 1.3.0 Beta 7 (4eb78641f8 GPU wait accounting and redundant device-idle elision; 453256ffdb no synchronous pipeline retry ladder on the render thread). Closing -- reopen or comment if you still see this.

Shipped in 1.3.0 Beta 7 (4eb78641f8 GPU wait accounting and redundant device-idle elision; 453256ffdb no synchronous pipeline retry ladder on the render thread). Closing -- reopen or comment if you still see this.

sky_line

2026-10-14 06:33:44 +00:00

closed this issue
removed the
status
in-progress
label

No milestone

No project

No assignees

1 participant

Notifications

Due date

The due date is invalid or out of range. Please use the format "yyyy-mm-dd".

No due date set.

Dependencies

No dependencies set.

Reference

sky_line/Slipstream#699

No description provided.

Rows
Columns