On 2013-09-24 13:51:04 -0300, Alvaro Herrera wrote:
> David Rowley escribió:
>
> > I do see a 15-18% slow down with the patched version, so perhaps I'll need
> > to look to see if I can speed it up a bit, although I do feel this
> > benchmark is not quite a normal workload.
>
> Ouch. That's certainly way too much. Is the compiler inlining
> process_log_prefix_padding()? If not, does it do it if you add "inline"
> to it? That might speed up things a bit. If that's not enough, maybe
> you need some way to return to the original coding for the case where no
> padding is set in front of each option.
From a very short look without actually running it I'd guess the issue
is all the $* things you're now passing to do appendStringInfo (which
passes them off to vsnprintf).
How does it look without that?
Greetings,
Andres Freund
-- Andres Freund http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training &
Services