Re: Move PinBuffer and UnpinBuffer to atomics

On 2016-04-05 12:56:46 +0530, Dilip Kumar wrote:
> On Mon, Apr 4, 2016 at 2:28 PM, Andres Freund <andres@anarazel.de> wrote:
> 
> > Hm, interesting. I suspect that's because of the missing backoff in my
> > experimental patch. If you apply the attached patch ontop of that
> > (requires infrastructure from pinunpin), how does performance develop?
> >
> 
> I have applied this patch also, but still results are same, I mean around
> 550,000 with 64 threads and 650,000 with 128 client with lot of
> fluctuations..
> 
> *128 client
> **(head+**0001-WIP-Avoid-the-use-of-a-separate-spinlock-to-protect
> +pinunpin-cas-9+backoff)*
> 
> run1 645769
> run2 643161
> run3 *285546*
> run4 *289421*
> run5 630772
> run6 *284363*

I wonder what
http://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=09adc9a8c09c9640de05c7023b27fb83c761e91c
does to all these numbers. It seems entirely possible that "this" is
mainly changing the alignment of some common datastructures...

- Andres