Use posix_fadvise(2) instead of pread(2) for faulting pages

TritonDataCenter / pg_prefaulter

Faults pages into PostgreSQL shared_buffers or filesystem caches in advance of WAL apply

Apache License 2.0

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Use posix_fadvise(2) instead of pread(2) for faulting pages #46

Open sean- opened 6 years ago

sean- commented 6 years ago

Suggestion from the audience:

[ ] https://linux.die.net/man/2/posix_fadvise
[ ] https://www.freebsd.org/cgi/man.cgi?query=posix_fadvise

Flag: POSIX_FADV_WILLNEED

While the memory bandwidth consumed from copying data from the OS into userland is not much, there is room for improvement through the use of posix_fadvise(2) instead of pread(2).