maria-developers team mailing list archive

[Sergey Vojtovich <svoj@xxxxxxxxxxx>]

Hi Sergei,

On Thu, Jun 18, 2015 at 08:44:46AM +0200, Sergei Golubchik wrote:
> Hi, Sergey!
> 
> On Jun 17, svoj@xxxxxxxxxxx wrote:
> > revision-id: 2e08ec24623e0b3d3db02333e16658dcfaa0535c
> > parent(s): b776f8d3a8afff55d5f8208da7bdfce9aa33eb39
> > committer: Sergey Vojtovich
> > branch nick: mariadb
> > timestamp: 2015-06-17 13:09:22 +0400
> > message:
> > 
> > MDEV-7956 - handler::rebind_psi() takes 0.07% in OLTP RO
> > 
> > Do not call handler::rebind_psi() and handler::unbind_psi() when performance
> > schema is compiled out.
> > 
> > Overhead change:
> > handler::rebind_psi 0.04% -> out of radar
> > handler::unbind_psi 0.03% -> out of radar
> > open_table          0.21% -> 0.18%
> > close_thread_table  0.05% -> 0.05%
> 
> Really? I don't believe it. handler::rebind_psi() and
> handler::unbind_psi() are empty methods, not doing anything. There's
> only a cost a virtual function call. And you're saying that it took 15%
> of the open_table() execution time?
This can be noise. What matters here is that rebind_psi/unbind_psi went out of
radar: this is sure sign of improvement. Can't remember why I included caller
stats at all.

Regards,
Sergey