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refactor: route cpu placement through backend specs (#1654)

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leejet
2026-06-14 15:52:24 +08:00
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docs/backend.md
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@@ -124,16 +124,16 @@ Runtime and parameter assignments also share the same backend cache. If `--backe
## Compatibility flags
The older CPU placement flags are still supported:
The example CLI/server still accepts these older CPU placement flags as compatibility aliases:
- `--clip-on-cpu`
- `--vae-on-cpu`
- `--control-net-cpu`
- `--offload-to-cpu`
`--clip-on-cpu`, `--vae-on-cpu`, and `--control-net-cpu` affect runtime backend assignment only when `--backend` is not set. They map to `te=cpu`, `vae=cpu`, and `controlnet=cpu`.
`--clip-on-cpu`, `--vae-on-cpu`, and `--control-net-cpu` are deprecated. The example argument layer prepends `te=cpu`, `vae=cpu`, and `controlnet=cpu` to `--backend` before creating the context.
`--offload-to-cpu` prepends a CPU default to the parameter assignment before parsing:
`--offload-to-cpu` prepends a CPU default to the parameter assignment in the caller before creating the context:
```shell
--params-backend '*=cpu'
@@ -141,4 +141,4 @@ The older CPU placement flags are still supported:
Because this default is inserted first, later explicit `--params-backend` entries can still override it, for example `--offload-to-cpu --params-backend te=disk` keeps non-TE parameters on CPU and reloads TE parameters from disk.
Explicit `--backend` and `--params-backend` assignments are preferred for new commands.
Library callers should set `backend` and `params_backend` directly. The old CPU/offload fields are no longer part of the C API. Explicit `--backend` and `--params-backend` assignments are preferred for new commands.