Re: patch for new feature: Buffer Cache Hibernation

On 06/01/2011 03:03 AM, Tatsuo Ishii wrote:
> Also I really want to see the performance comparison between these two
> approaches in the real world database.
>    

Well, tell me how big of a performance improvement you want PgFincore to 
win by, and I'll construct a benchmark where it does that.  If you pick 
a database size that fits in the OS cache, but is bigger than 
shared_buffers, the difference between the approaches is huge.  The 
opposite--trying to find a case where this hibernation approach wins--is 
extremely hard to do.

Anyway, further discussion of this patch is kind of a waste right now.  
We've never gotten the patch actually sent to the list to establish a 
proper contribution (just pointers to a web page), and no feedback on 
that or other suggestions for redesign (extension repackaging, GUC 
renaming, removing unused code, and a few more).  Unless the author 
shows up again in the next two weeks, this is getting bounced back with 
no review as code we can't use.

-- 
Greg Smith   2ndQuadrant US    greg@2ndQuadrant.com   Baltimore, MD
PostgreSQL Training, Services, and 24x7 Support  www.2ndQuadrant.us