Hi
>From: Alvaro Herrera
>Sent: Wednesday, February 19, 2020 4:23 PM
>To: Lars Aksel Opsahl
>Cc: Laurenz Albe ; Pavel Stehule
>; Tom Lane ;
>pgsql-performance@lists.postgresql.org
>Subject: Re: SubtransControlLock and performance
On 2020-Feb-19, Lars Aksel Opsahl wrote:
> With the values above I did see same performance problems and we ended
> with a lot of subtransControlLock.
>
> So I started to change the code based on your feedbacks.
>
> - What seems to work very good in combination with a catch exception
> and retry
Hi
>From: Laurenz Albe
>Sent: Tuesday, February 18, 2020 6:27 PM
>ATo: Pavel Stehule ; Tom Lane
>Cc: Lars Aksel Opsahl ;
>pgsql-performance@lists.postgresql.org
>Subject: Re: SubtransControlLock and performance problems
>
út 18. 2. 2020 v 18:27 odesílatel Laurenz Albe
napsal:
> On Mon, 2020-02-17 at 19:41 +0100, Pavel Stehule wrote:
> > I tested
> >
> > CREATE OR REPLACE FUNCTION public.fx(integer)
> > RETURNS void
> > LANGUAGE plpgsql
> > AS $function$
> > begin
> > for i in 1..$1 loop
> > begin
> > ins
On Mon, 2020-02-17 at 19:41 +0100, Pavel Stehule wrote:
> I tested
>
> CREATE OR REPLACE FUNCTION public.fx(integer)
> RETURNS void
> LANGUAGE plpgsql
> AS $function$
> begin
> for i in 1..$1 loop
> begin
> insert into foo values(i);
> exception when others then
> raise notice 'yyy';
On 2020-Feb-16, Lars Aksel Opsahl wrote:
> On a server with 32 cores and 250 GB memory, with CentOS 7 and kernel
> 4.4.214-1.el7.elrepo.x86_64, I try to run 30 parallel threads using
> dblink. (https://github.com/larsop/postgres_execute_parallel) . I have
> tried to disconnect and reconnect in the
po 17. 2. 2020 v 19:23 odesílatel Tom Lane napsal:
> Pavel Stehule writes:
> > po 17. 2. 2020 v 17:36 odesílatel Laurenz Albe >
> > napsal:
> >> Either use shorter transactions, or start fewer subtransactions.
>
> > it is interesting topic, but I don't see it in my example
>
> > CREATE OR REPLA
Pavel Stehule writes:
> po 17. 2. 2020 v 17:36 odesílatel Laurenz Albe
> napsal:
>> Either use shorter transactions, or start fewer subtransactions.
> it is interesting topic, but I don't see it in my example
> CREATE OR REPLACE FUNCTION public.fx(integer)
> RETURNS void
> LANGUAGE plpgsql
>
Hi
po 17. 2. 2020 v 17:36 odesílatel Laurenz Albe
napsal:
> On Mon, 2020-02-17 at 15:03 +, Lars Aksel Opsahl wrote:
> > I have tested in branch (
> https://github.com/larsop/resolve-overlap-and-gap/tree/add_postgis_topology_using_func
> )
> > where I use only have functions and no procedures
On Mon, 2020-02-17 at 15:03 +, Lars Aksel Opsahl wrote:
> I have tested in branch (
> https://github.com/larsop/resolve-overlap-and-gap/tree/add_postgis_topology_using_func)
> where I use only have functions and no procedures and I still have the same
> problem with subtransaction locks.
>
>From: Laurenz Albe
>Sent: Monday, February 17, 2020 10:53 AM
>To: Lars Aksel Opsahl ;
>pgsql-performance@lists.postgresql.org
>Subject: Re: SubtransControlLock and performance problems
>
>Lars Aksel Opsahl wrote:
>> What happens is that after some minutes t
Lars Aksel Opsahl wrote:
> What happens is that after some minutes the CPU can fall to maybe 20% usage
> and most of
> the threads are blocked by SubtransControlLock, and when the number
> SubtransControlLock
> goes down the CPU load increases again. The jobs usually goes through without
> any e
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