On Fri, Oct 21, 2011 at 3:07 PM, Robert Haas <robertmhaas@gmail.com> wrote:
> [ oprofile results ]
*grovels through the line-by-line results*
Hmm, I guess there is a bit of a hotspot in StoreIndexTuple, which is
probably being folded into IndexOnlyNext in the per-function timings:
ExecClearTuple(slot); for (i = 0; i < nindexatts; i++) values[i] = index_getattr(itup, i + 1, itupdesc,
&isnull[i]); ExecStoreVirtualTuple(slot);
If I'm reading these results right, that section is about 3% of the
total number of samples.
Also, this line is kind of expensive:
if (!visibilitymap_test(scandesc->heapRelation, ItemPointerGetBlockNumber(tid),
&node->ioss_VMBuffer))
Around 2%. But I don't see any way to avoid that, or even make it cheaper.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
