Re: Emergency FBR: Lower concurrency on postgres to help load

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On Fri, 11 Oct 2019 at 12:10, Kevin Fenzi <kevin@xxxxxxxxx> wrote:
>
> On Fri, Oct 11, 2019 at 09:52:20AM -0400, Stephen John Smoogen wrote:
> > Currently the load on db-koji is 140+ and it is slow and
> > non-responsive to users. I believe it is the below change which has
> > affected this. I would like to lower down io to 32 to see if that
> > affects things and tune further if needed. I am not doing this until
> > Kevin or Patrick are around as it will affect koji and there is an
> > order needed
> >
> > diff --git a/roles/postgresql_server/templates/postgresql.conf
> > b/roles/postgresql_server/templates/postgresql.conf
> > index cbaaaae..341340c 100644
> > --- a/roles/postgresql_server/templates/postgresql.conf
> > +++ b/roles/postgresql_server/templates/postgresql.conf
> > @@ -504,4 +504,4 @@ default_text_search_config = 'pg_catalog.english'
> >  #custom_variable_classes = ''           # list of custom variable class names
> >  #
> >  # Number of concurrent i/o operations at the same time. The default is 1.
> > -effective_io_concurrency = 100
> > +effective_io_concurrency = 32
>
> We could try it, but I am not sure that would do the trick.
>
> It was doing this before I had that value set...
>
> The issue started around the time we upgraded to 1.18.0 koji, and also
> added memory, so it's hard to know what change really caused it.
>
> I guess we can try it, but I'd like to investgate some more today and
> see if I can figure out a reason for this.
>
> I did kill the existing dump.
> I'm trying a different dump setting to see if it cause anything.

I am going to say cancel this FBR until other methods have been exhausted.



-- 
Stephen J Smoogen.
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