diff options
| 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/backend/storage/buffer/bufmgr.c | |
| 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/backend/storage/buffer/bufmgr.c')
| -rw-r--r-- | src/backend/storage/buffer/bufmgr.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c index 7a7748b6955..e05e2b34565 100644 --- a/src/backend/storage/buffer/bufmgr.c +++ b/src/backend/storage/buffer/bufmgr.c @@ -120,6 +120,13 @@ bool track_io_timing = false; int effective_io_concurrency = 0; /* + * Like effective_io_concurrency, but used by maintenance code paths that might + * benefit from a higher setting because they work on behalf of many sessions. + * Overridden by the tablespace setting of the same name. + */ +int maintenance_io_concurrency = 0; + +/* * GUC variables about triggering kernel writeback for buffers written; OS * dependent defaults are set via the GUC mechanism. */ |