Page manager with buffer pool #169
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nqd
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nqd
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Sep 18, 2025
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| /// Retrieves a page from the memory mapped file. | ||
| pub fn get(&self, _snapshot_id: SnapshotId, page_id: PageId) -> Result<Page<'_>, PageError> { |
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remove unused snapshot_id
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nqd
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Sep 18, 2025
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| // TODO: Temporarily use LruReplacer as the eviction policy, replace with a better eviction policy | ||
| pub(crate) struct CacheEvict { | ||
| lru_replacer: LruReplacer<PageId>, |
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A new cache eviction policy will be in the nextPR
nqd
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Sep 18, 2025
| .map_err(|_| PageError::InvalidValue)?; | ||
| // Use O_DIRECT on Linux for better performance, but not available on macOS | ||
| #[cfg(target_os = "linux")] | ||
| let flags = libc::O_RDWR | libc::O_CREAT | libc::O_DIRECT; |
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O_DIRECT to bypass OS page cache, hence avoid double caching
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This PR provides a buffer pool as an alternative to mmap for page management.
Benchmark shows that writing is 3 - 4 times faster than the current mmap. Run example/insert to insert 20 million EOA + storage result:
The current cache eviction is just a proof of concept and is not efficient. Another PR will be raised to provide a better eviction policy.