| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Kouhei Kaigai <kaigai(at)ak(dot)jp(dot)nec(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Amit Kapila <amit(dot)kapila(at)enterprisedb(dot)com> |
| Subject: | Re: Combining Aggregates |
| Date: | 2016-01-19 04:24:51 |
| Message-ID: | 29435.1453177491@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> Here is a patch that helps a good deal. I changed things so that when
> we create a context, we always allocate at least 1kB.
That's going to kill performance in some other cases; subtransactions
in particular rely on the subtransaction's TransactionContext not causing
any actual malloc unless something gets put into the TransactionContext.
regards, tom lane
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