Re: dbt2 performance regresses from 9.1.6 to 9.2.1

On Sun, Nov 4, 2012 at 7:23 PM, Dong Ye <yed@vmware.com> wrote:
>> You are using prepared statements, this makes me think that this
>> regression might be due to support for parameter specific plans for
>> prepared statements. [1] Can you run the test on both versions without
>> prepared statements and see if the regressions remains.
>
> Without prepare statement, we got 48837.33 avg notpm with 9.1.6 and 43264.54 avg notpm with 9.2.1.
> notps over time shows the slowdown of 9.2.1 is evident during the entire course of the run.
> Their profiles are posted on http://pgsql.privatepaste.com/b770f72967 (9.1.6) and
http://pgsql.privatepaste.com/6fa8b7f174(9.2.1). 

You know... it does look as if 9.2.1 is generating a lot more pressure
into the memory allocator (AllocSetAlloc notably higher).