HiCache, fixing hash value indexing #8636
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Summary of Changes
Hello @xiezhq-hermann, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
I've addressed an indexing issue within the HiCache memory management system, specifically concerning how hash_value arrays are accessed. The core problem was that hash_value was being indexed using token-based lengths, while it should have been indexed based on page counts. My changes ensure that all slicing operations on hash_value are now correctly aligned with self.page_size, preventing potential errors in cache management and improving the accuracy of hash value lookups and updates.
Highlights
- Corrected hash value indexing in prefetch progress: I've corrected the indexing logic for
hash_valuewithin thecheck_prefetch_progressfunction. Previously,hash_valuewas sliced directly usingmin_completed_tokens, which was incorrect given thathash_valuelikely corresponds to pages rather than individual tokens. The fix now correctly dividesmin_completed_tokensbyself.page_sizeto ensure page-aligned indexing. - Adjusted hash value slicing in insertion helper: I've also applied a similar correction to the
_insert_helper_hostmethod. The slicing ofhash_valuebased onprefix_lenwas adjusted toprefix_len // self.page_size, ensuring that the hash value array is always indexed by page count, maintaining consistency with the underlying memory management.
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Code Review
This pull request fixes a bug in HiCache's hash value indexing. The hash_value list, which is indexed by page, was being incorrectly indexed by token count. The changes in check_prefetch_progress and _insert_helper_host correct this by using integer division with page_size to get the proper page index. These changes are correct and improve the reliability of the hierarchical cache.
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