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Re: Rev 3915: MDEV-5388 - Reduce usage of LOCK_open: unused_tables

 

Hi, Sergey!

On Dec 11, Sergey Vojtovich wrote:
> On Tue, Dec 10, 2013 at 10:14:32PM +0100, Sergei Golubchik wrote:
> > Hi, Sergey!
> > 
> > Did you benchmark the improvement you get with this patch?
> Yes, my results against recent 10.0 are in jira task description.

Ah, I see, thanks. Great!

> Also please find Axel's results (MDEV-4956 + MDEV-5388) attached.
> From Axel's results please note performance regression between 10.0.4
> and 10.0.5.

Why is that, do you know?

> > Okay, so you only purge one table at time? Since purge is kind of an
> > expensive operation, it's better to amortize the cost of it by
> > purging many tables at once.
> With current algorithm it is impossible to get multiple tables for
> purge here, explanation above.

But you said that in the next patch it becomes possible, or did I
misunderstand?

Regards,
Sergei


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