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| author | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2015-09-08 12:51:42 -0300 |
|---|---|---|
| committer | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2015-09-08 12:51:42 -0300 |
| commit | 1aba62ec635f5852bc45ce65482366e541e61ff5 (patch) | |
| tree | 1161cc00324cb8d229b831a944432646ae1552d5 /src/include/storage/bufmgr.h | |
| parent | 665a00c9e2598e3be366cb9f99c0a04a51dd8c7a (diff) | |
Allow per-tablespace effective_io_concurrency
Per discussion, nowadays it is possible to have tablespaces that have
wildly different I/O characteristics from others. Setting different
effective_io_concurrency parameters for those has been measured to
improve performance.
Author: Julien Rouhaud
Reviewed by: Andres Freund
Diffstat (limited to 'src/include/storage/bufmgr.h')
| -rw-r--r-- | src/include/storage/bufmgr.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h index ec0a254566e..0f59201bf5b 100644 --- a/src/include/storage/bufmgr.h +++ b/src/include/storage/bufmgr.h @@ -58,11 +58,17 @@ extern int target_prefetch_pages; /* in buf_init.c */ extern PGDLLIMPORT char *BufferBlocks; +/* in guc.c */ +extern int effective_io_concurrency; + /* in localbuf.c */ extern PGDLLIMPORT int NLocBuffer; extern PGDLLIMPORT Block *LocalBufferBlockPointers; extern PGDLLIMPORT int32 *LocalRefCount; +/* upper limit for effective_io_concurrency */ +#define MAX_IO_CONCURRENCY 1000 + /* special block number for ReadBuffer() */ #define P_NEW InvalidBlockNumber /* grow the file to get a new page */ @@ -144,6 +150,7 @@ extern PGDLLIMPORT int32 *LocalRefCount; /* * prototypes for functions in bufmgr.c */ +extern bool ComputeIoConcurrency(int io_concurrency, double *target); extern void PrefetchBuffer(Relation reln, ForkNumber forkNum, BlockNumber blockNum); extern Buffer ReadBuffer(Relation reln, BlockNumber blockNum); |