Reducing NeMo-Speech working-set memory usage on Windows

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3/5
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半日
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35/100
issue の種類
機能追加
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おおむね明確
活発さ
活発
技術スタック
cpp

調査の方向性

The payload names no source files, so start from the model loading path where the GGUF loader and mmap are mentioned, and check whether the Windows-only memory calls belong in a platform-specific file. The reporter's experiment used the Windows EmptyWorkingSet() API, so confirm first with a maintainer whether an optional trim is wanted at all. Done means an opt-in trim that runs without unloading the model, with the measured working set reported before and after.

索引モデルが issue の本文から書いたものです。

説明

Hi, I have been testing NeMo-Speech in Windows on a Nvidia GPU using CUDA. I'm RAM-limited because I have a lot of other software running which was one of the reasons I wanted to offload the speech model to the GPU.

My issue is after loading, nemo-speech.exe was showing about 633 MB of private working set in Windows Task Manager, despite the model weights being loaded onto the GPU. I wondered whether mmap or the GGUF loader's temporary buffers were responsible, but disabling mmap did not resolve the issue. Using VMMap showed substantial committed heap memory, although only a fraction of it was resident in physical RAM.

I experimented with the Windows API EmptyWorkingSet(), which allows Windows to remove pages from a process's working set without terminating the process or releasing its underlying allocations.

The results were:
Initial private working set | ~633 MB
Working set after trimming | ~2.2 MB
After a subsequent transcription | ~50 MB
During continued dictation | ~around 55MB and it settles there.
Private bytes | ~6.38 GB (unchanged)

So I seem to have recovered about 580MB of system RAM without a noticeable downside.

Would it be worth considering an optional Windows-specific working-set trimming mechanism? A one-off trim could substantially reduce the resident RAM footprint without unloading the model, and it can then grow naturally during use.

主要言語
C++
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237
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53
平均マージ
13時間 10分
マージ済み PR(30日)
12

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