maria-developers team mailing list archive

[Sergei Golubchik <serg@xxxxxxxxxxx>]

Hi, Sergey!

On Feb 27, Sergey Vojtovich wrote:
> At lp:maria/10.0
> 
> ------------------------------------------------------------
> revno: 4011
> revision-id: svoj@xxxxxxxxxxx-20140227141521-fgj5b0h3qbijyojh
> parent: svoj@xxxxxxxxxxx-20140220072533-l3au3y7mrsyclfpb
> committer: Sergey Vojtovich <svoj@xxxxxxxxxxx>
> branch nick: 10.0
> timestamp: Thu 2014-02-27 18:15:21 +0400
> message:
>   MDEV-5755 - Scalability: let LOCK_open and THR_LOCK::mutex be normal mutexes
>   
>   Normal mutexes scale better than adaptive at high thread count.
>   At low thread count they behave similarly.

To summarize Axel results:
 at low concurency normal can be ~1% slower.
 at high concurrency r/o - normal are up to 25% faster.
 at high concurrency r/w - normal are up to 10% slower.

That last result bothers me a litte.

Regards,
Sergei