maria-developers team mailing list archive

[Sergei Golubchik <serg@xxxxxxxxxxx>]

Hi, Sergey!

On Apr 22, svoj@xxxxxxxxxxx wrote:
> revision-id: 7feee74dd30c96bd50d1c90e4ce3b06a656b17a5
> parent(s): 696188fe2f0756a98914df5b95ba302f7e5c55df
> committer: Sergey Vojtovich
> branch nick: mariadb
> timestamp: 2015-04-22 13:29:56 +0400
> message:
> 
> MDEV-7943 - pthread_getspecific() takes 0.76% in OLTP RO
> 
> Added THD argument to select_result and all derivative classes.  This
> reduces number of pthread_getspecific calls from 796 to 776 per OLTP
> RO transaction.

Lots of changes for a little gain :)
Ok to push.

An idea. Create a variant of Sql_alloc (say, Sql_alloc_explicit, a
parent of Sql_alloc) that does not use current_thd but requires MEM_ROOT
to be specified explicitly. And use it for classes where you want it.

Regards,
Sergei