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[GH-ISSUE #1773] 微调模型时，cpu可用内存一直下降直到爆炸 #1115

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opened 2026-10-29 14:48:42 +00:00 by bsakaguchi · 4 comments
bsakaguchi commented 2026-10-29 14:48:42 +00:00
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Originally created by @SamsFirth on GitHub (Dec 31, 2025).
Original GitHub issue: https://github.com/kvcache-ai/ktransformers/issues/1773

Originally assigned to: @JimmyPeilinLi on GitHub.

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  • I have read the above rules and searched the existing issues.

System Info

kt0.4.2版本，py3.11，cpu支持amx

Reproduction

使用默认的训练配置文件进行sft，free -h输出的available内存会不断下降，直到训练异常退出

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Originally created by @SamsFirth on GitHub (Dec 31, 2025). Original GitHub issue: https://github.com/kvcache-ai/ktransformers/issues/1773 Originally assigned to: @JimmyPeilinLi on GitHub. ### Reminder - [x] I have read the above rules and searched the existing issues. ### System Info kt0.4.2版本，py3.11，cpu支持amx ### Reproduction 使用默认的训练配置文件进行sft，free -h输出的available内存会不断下降，直到训练异常退出 ### Others _No response_
bsakaguchi commented 2026-10-29 14:48:43 +00:00
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@KMSorSMS commented on GitHub (Jan 8, 2026):

你得内存大小是多少呢？这个好像要 2T 内存

<!-- gh-comment-id:3723442715 --> @KMSorSMS commented on GitHub (Jan 8, 2026): 你得内存大小是多少呢？这个好像要 2T 内存
bsakaguchi commented 2026-10-29 14:48:43 +00:00
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@SamsFirth commented on GitHub (Jan 12, 2026):

你得内存大小是多少呢？这个好像要 2T 内存

有两个t，加载完模型剩大约400多g，然后训练开始，之后内存就会不断下降

<!-- gh-comment-id:3736724492 --> @SamsFirth commented on GitHub (Jan 12, 2026): > 你得内存大小是多少呢？这个好像要 2T 内存 有两个t，加载完模型剩大约400多g，然后训练开始，之后内存就会不断下降
bsakaguchi commented 2026-10-29 14:48:43 +00:00
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@ovowei commented on GitHub (Jan 22, 2026):

请提供下更详细的配置和运行信息

<!-- gh-comment-id:3783875884 --> @ovowei commented on GitHub (Jan 22, 2026): 请提供下更详细的配置和运行信息
bsakaguchi commented 2026-10-29 14:48:43 +00:00
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@SamsFirth commented on GitHub (Jan 27, 2026):

请提供下更详细的配置和运行信息

发现需要在sft/lora.py中的training_step函数中添加每隔几步就回收一次内存的功能就可以解决

<!-- gh-comment-id:3803945150 --> @SamsFirth commented on GitHub (Jan 27, 2026): > 请提供下更详细的配置和运行信息 发现需要在sft/lora.py中的training_step函数中添加每隔几步就回收一次内存的功能就可以解决
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