maria-developers team mailing list archive

[Sergei Golubchik <serg@xxxxxxxxxxx>]

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?

Regards,
Sergei