Stabilize DeepCompile ZeRO-3 memory scheduling#8169
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Signed-off-by: Masahiro Tanaka <mtanaka@anyscale.com>
Signed-off-by: Masahiro Tanaka <mtanaka@anyscale.com>
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Depends on #8159.
DeepCompile's ZeRO-3 scheduler does not consistently account for memory pressure across gather/release ordering, prefetch, selective gathering, and native gather-buffer reuse. This can retain excess gathered storage or trigger a full-parameter gather while Dynamo evaluates guards.
This PR adds rank-consistent scheduler budgeting and diagnostics, coordinates prefetch and selective gathering with graph profiling, reuses native gather storage within a bounded pressure-aware lifecycle, and avoids guard-time full-parameter gathers while the DeepCompile eager fallback is active.