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Add prefetching support on macOS

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macOS doesn't have posix_fadvise(), but fcntl() with the F_RDADVISE
command does the same thing.

Some related documentation has been generalized to not mention
posix_advise() specifically anymore.

Reviewed-by: Thomas Munro <thomas.munro@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/0827edec-1317-4917-a186-035eb1e3241d%40eisentraut.org
This commit is contained in:
Peter Eisentraut
2024-08-28 07:26:48 +02:00
parent 2e6a8047f0
commit 6654bb9204
6 changed files with 54 additions and 35 deletions
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4
src/backend/commands/variable.c
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@ -1212,7 +1212,7 @@ check_effective_io_concurrency(int *newval, void **extra, GucSource source)
#ifndef USE_PREFETCH
if (*newval != 0)
{
GUC_check_errdetail("\"effective_io_concurrency\" must be set to 0 on platforms that lack posix_fadvise().");
GUC_check_errdetail("\"effective_io_concurrency\" must be set to 0 on platforms that lack support for issuing read-ahead advice.");
return false;
}
#endif /* USE_PREFETCH */
@ -1225,7 +1225,7 @@ check_maintenance_io_concurrency(int *newval, void **extra, GucSource source)
#ifndef USE_PREFETCH
if (*newval != 0)
{
GUC_check_errdetail("\"maintenance_io_concurrency\" must be set to 0 on platforms that lack posix_fadvise().");
GUC_check_errdetail("\"maintenance_io_concurrency\" must be set to 0 on platforms that lack support for issuing read-ahead advice.");
return false;
}
#endif /* USE_PREFETCH */