On 2016-08-17 16:23:29 -0700, Peter Geoghegan wrote: > On Wed, Aug 17, 2016 at 4:16 PM, Andres Freund <and...@anarazel.de> wrote: > >> Does anyone have any ideas on how to: > >> > >> 1). Directly address the reform_and_rewrite_tuple() bottleneck. > > > > What part of is actually the expensive bit? It does a whole lot of > > things. Forming/Deforming tuples, the hash lookups in > > rewrite_heap_tuple(), ...? > > Perhaps the attached svg "flamegraph" will give you some idea. This is > based on the "perf cache-misses" event type.
Could you also provide a strace -ttt -T -c and a cpu cycles flamegraph? -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
