By default, freeing memory in CUDA is expensive because it does a GPU sync. Because of this, PyTorch avoids freeing and mallocing memory through CUDA, and tries to manage it itself. When blocks are freed, the allocator just keeps them in their own cache. The allocator can then use the free blocks in the cache when something else is allocated. But if these blocks are fragmented and there isn’t a large enough cache block and all GPU memory is already allocated, PyTorch has to free all the allocator cached blocks then allocate from CUDA, which is a slow process. This is what our program is getting blocked by. This situation might look familiar if you’ve taken an operating systems class.
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LLMs are useful. They make for a very productive flow when the person using them knows what correct looks like. An experienced database engineer using an LLM to scaffold a B-tree would have caught the is_ipk bug in code review because they know what a query plan should emit. An experienced ops engineer would never have accepted 82,000 lines instead of a cron job one-liner. The tool is at its best when the developer can define the acceptance criteria as specific, measurable conditions that help distinguish working from broken. Using the LLM to generate the solution in this case can be faster while also being correct. Without those criteria, you are not programming but merely generating tokens and hoping.，推荐阅读heLLoword翻译获取更多信息