From: | tgl(at)postgresql(dot)org (Tom Lane) |
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To: | pgsql-committers(at)postgresql(dot)org |
Subject: | pgsql: Make some simple performance improvements in |
Date: | 2007-09-21 17:36:53 |
Message-ID: | 20070921173653.7203B753E4C@cvs.postgresql.org |
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Lists: | pgsql-committers |
Log Message:
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Make some simple performance improvements in TransactionIdIsInProgress().
For XIDs of our own transaction and subtransactions, it's cheaper to ask
TransactionIdIsCurrentTransactionId() than to look in shared memory.
Also, the xids[] work array is always the same size within any given
process, so malloc it just once instead of doing a palloc/pfree on every
call; aside from being faster this lets us get rid of some goto's, since
we no longer have any end-of-function pfree to do. Both ideas by Heikki.
Modified Files:
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pgsql/src/backend/storage/ipc:
procarray.c (r1.33 -> r1.34)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/ipc/procarray.c?r1=1.33&r2=1.34)
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