On 2014-06-29 19:52:23 -0400, Tom Lane wrote: > Andres Freund <and...@2ndquadrant.com> writes: > > Why aren't we delaying allocations in e.g. AtStart_Inval(), > > AfterTriggerBeginXact() to when the data structures are acutally used? > > Aren't we? Neither of those would be doing much work certainly.
They are perhaps not doing much in absolute terms, but it's a fair share of the processing overhead for simple statements. AfterTriggerBeginXact() is called unconditionally from StartTransaction() and does three MemoryContextAlloc()s. AtStart_Inval() one. I think they should just be initialized whenever the memory is used? Doesn't look too complicated to me. Greetings, Andres Freund -- Andres Freund http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
