pytorch-rocm-llms: unify transformers pin and disable mmap for halo gpt-oss-20b - #659
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pytorch-rocm-llms: unify transformers pin and disable mmap for halo gpt-oss-20b#659lucbruni-amd wants to merge 3 commits into
lucbruni-amd wants to merge 3 commits into
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…mmap on halo Windows halo loaded gpt-oss-20b via safetensors mmap, which exhausts the Windows paged pool on the ~40GB bf16 model (OSError 1450). Add disable_mmap to read weights into RAM instead. Also unify the transformers pin at 5.10.1 across all devices (halo-windows was stale at 4.57.1, which lacks disable_mmap; halo-linux and others-linux were unpinned). Possibly fixes #655.
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July 29, 2026 15:03
lucbruni-amd
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On Windows, halo loads
gpt-oss-20b(dequantized to ~40GB bf16 since MXFP4/Triton kernels aren't available on Windows ROCm).safetensorsmemory-maps the shards, and a mapping that large intermittently exhausts the Windows paged pool:OSError 1450 (ERROR_NO_SYSTEM_RESOURCES). Not a RAM limit (halo has 128GB).Fix: pass
disable_mmap=Trueto the halorun-modelload so weights are read into RAM instead of mmapped. Available in transformers 5.x.Also unify the transformers pin at
5.10.1across all devices/OSes: halo-windows was stale at4.57.1(which lacksdisable_mmap), halo-linux and others-linux were floating.Possibly fixes #655.