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https://github.com/seaweedfs/seaweedfs.git
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Chris Lu
e1fa4ec756
* perf(cache): drop OS page cache after disk cache reads After reading from the on-disk chunk cache, advise the kernel via FADV_DONTNEED to release the corresponding page cache pages. This prevents double-caching the same data in both user-space and kernel page caches, freeing RAM for other uses on systems with large disk caches. * fix(cache): guard dropReadCache against zero length and invalid fd A zero-length fadvise is interpreted as "to end of file" on Linux, which would inadvertently drop the page cache for the entire remainder of the cache volume. Also check fd >= 0 to avoid unnecessary syscalls when the backend file is closed. * perf(cache): only apply FADV_DONTNEED for reads >= 1 MiB For small needle reads the syscall overhead outweighs the memory savings, and the kernel page cache is more beneficial for warm data. Restrict fadvise to reads of at least 1 MiB where the freed page cache is meaningful.
9 lines
166 B
Go
9 lines
166 B
Go
//go:build !linux
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package util
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// DropOSPageCache is a no-op on non-Linux platforms.
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func DropOSPageCache(fd int, offset int64, length int64) error {
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return nil
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}
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