diff options
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); |