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| author | Thomas Munro <tmunro@postgresql.org> | 2020-03-16 12:31:34 +1300 |
|---|---|---|
| committer | Thomas Munro <tmunro@postgresql.org> | 2020-03-16 17:14:26 +1300 |
| commit | fc34b0d9de27ab5ac2887da00b3892bdabd89e45 (patch) | |
| tree | bfa65c51892f19538b6e7e53633654ddce5eb989 /src/include/utils/spccache.h | |
| parent | b09ff53667ffc986371ec8ffa372916ad460220d (diff) | |
| download | postgresql-fc34b0d9de27ab5ac2887da00b3892bdabd89e45.tar.gz postgresql-fc34b0d9de27ab5ac2887da00b3892bdabd89e45.zip | |
Introduce a maintenance_io_concurrency setting.
Introduce a GUC and a tablespace option to control I/O prefetching, much
like effective_io_concurrency, but for work that is done on behalf of
many client sessions.
Use the new setting in heapam.c instead of the hard-coded formula
effective_io_concurrency + 10 introduced by commit 558a9165e08. Go with
a default value of 10 for now, because it's a round number pretty close
to the value used for that existing case.
Discussion: https://postgr.es/m/CA%2BhUKGJUw08dPs_3EUcdO6M90GnjofPYrWp4YSLaBkgYwS-AqA%40mail.gmail.com
Diffstat (limited to 'src/include/utils/spccache.h')
| -rw-r--r-- | src/include/utils/spccache.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/include/utils/spccache.h b/src/include/utils/spccache.h index 5112ba3c376..7e4ec69aa2e 100644 --- a/src/include/utils/spccache.h +++ b/src/include/utils/spccache.h @@ -16,5 +16,6 @@ void get_tablespace_page_costs(Oid spcid, float8 *spc_random_page_cost, float8 *spc_seq_page_cost); int get_tablespace_io_concurrency(Oid spcid); +int get_tablespace_maintenance_io_concurrency(Oid spcid); #endif /* SPCCACHE_H */ |