zero.Init() should pin params in GPU memory as requested #2953
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…osoft/DeepSpeed into olruwase/zero_infer_partial_offload
…osoft/DeepSpeed into olruwase/zero_infer_partial_offload
…osoft/DeepSpeed into olruwase/zero_infer_partial_offload
…osoft/DeepSpeed into olruwase/zero_infer_partial_offload
…osoft/DeepSpeed into olruwase/zero_infer_partial_offload
mrwyattii
approved these changes
Mar 29, 2023
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Currently,
zero.Init()will offload all parameters even if user requested some to be pinned in GPU memory (using*_persistence_thresholdconfigs). Those params are eventually pinned into GPU memory after the first forward pass. Unfortunately,zero.Init()may fail CPU OOM which could be avoided by utilizing GPU and CPU memory per user request.This PR avoids this problem and improves flexibility of combining GPU and CPU memory.