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Scan the buffer pool just once, not once per fork, during relation drop.

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This provides a speedup of about 4X when NBuffers is large enough.
There is also a useful reduction in sinval traffic, since we
only do CacheInvalidateSmgr() once not once per fork.

Simon Riggs, reviewed and somewhat revised by Tom Lane
This commit is contained in:
Tom Lane
2012-06-07 17:42:27 -04:00
parent 5baf6da717
commit ece01aae47
9 changed files with 150 additions and 23 deletions
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6
src/backend/access/transam/twophase.c
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@@ -1356,12 +1356,8 @@ FinishPreparedTransaction(const char *gid, bool isCommit)
for (i = 0; i < ndelrels; i++)
{
SMgrRelation srel = smgropen(delrels[i], InvalidBackendId);
ForkNumber fork;
for (fork = 0; fork <= MAX_FORKNUM; fork++)
{
smgrdounlink(srel, fork, false);
}
smgrdounlink(srel, false);
smgrclose(srel);
}