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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2001-05-12 19:58:28 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2001-05-12 19:58:28 +0000 |
| commit | eedb7d18fafdc1dfff61de0f0cfb2c19baeae361 (patch) | |
| tree | fc1370013a1762507764fd5317f4cea8c893c0a2 /src/backend/storage/buffer/localbuf.c | |
| parent | d9f55edc2cf704dfa51bdcede9b61ce69aa69234 (diff) | |
| download | postgresql-eedb7d18fafdc1dfff61de0f0cfb2c19baeae361.tar.gz postgresql-eedb7d18fafdc1dfff61de0f0cfb2c19baeae361.zip | |
Modify RelationGetBufferForTuple() so that we only do lseek and lock
when we need to move to a new page; as long as we can insert the new
tuple on the same page as before, we only need LockBuffer and not the
expensive stuff. Also, twiddle bufmgr interfaces to avoid redundant
lseeks in RelationGetBufferForTuple and BufferAlloc. Successive inserts
now require one lseek per page added, rather than one per tuple with
several additional ones at each page boundary as happened before.
Lock contention when multiple backends are inserting in same table
is also greatly reduced.
Diffstat (limited to 'src/backend/storage/buffer/localbuf.c')
| -rw-r--r-- | src/backend/storage/buffer/localbuf.c | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/src/backend/storage/buffer/localbuf.c b/src/backend/storage/buffer/localbuf.c index 6e3cd756411..4b4a31066b2 100644 --- a/src/backend/storage/buffer/localbuf.c +++ b/src/backend/storage/buffer/localbuf.c @@ -16,7 +16,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/storage/buffer/localbuf.c,v 1.40 2001/03/22 03:59:44 momjian Exp $ + * $Header: /cvsroot/pgsql/src/backend/storage/buffer/localbuf.c,v 1.41 2001/05/12 19:58:27 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -54,12 +54,6 @@ LocalBufferAlloc(Relation reln, BlockNumber blockNum, bool *foundPtr) int i; BufferDesc *bufHdr = (BufferDesc *) NULL; - if (blockNum == P_NEW) - { - blockNum = reln->rd_nblocks; - reln->rd_nblocks++; - } - /* a low tech search for now -- not optimized for scans */ for (i = 0; i < NLocBuffer; i++) { |