Re: PgSQL 12 on WinSrv ~3x faster than on Linux

also if you can setup an external timer \timing , along with explain
analyse to get total time, it would help if everything else is same.

I have seen some threads thar mention added startup cost for parallel
workers on windows but not on Linux.
But I do not want to mix those threads here, but just FYI.

On Fri, Jun 4, 2021, 6:12 PM David Rowley <dgrowleyml(at)gmail(dot)com> wrote:

> On Fri, 4 Jun 2021 at 23:53, Taras Savchuk <taras(at)1adm(dot)ru> wrote:
> > My real life test is to "register" 10 _same_ documents (провести
> документы) in each of 1C/PostgreSQL DBs. Both PostgreSQL DBs are identical
> and just before test imported to PostgreSQL via application server (DT
> import).
> > On Windows Server test procedure takes 20-30 seconds, on Linux it takes
> 1m-1m10seconds. PostgreSQL VMs are running on same Hypervisor with same
> resources assigned to each of them.
> > Tuning PostgreSQL config and/or CentOS don't make any difference.
> Contrary on Windows VM we have almost 3x better performance with stock
> PostgreSQL config.
> >
> > Any ideas what's wrong? For me such a big difference on identical
> databases/queries looks strange.
>
> It's pretty difficult to say. You've not provided any useful details
> about the workload you're running.
>
> If this "register 10 _same_ documents" thing requires running some
> query, then you might want to look at EXPLAIN (ANALYZE, BUFFERS) for
> that query. You might want to consider doing SET track_io_timing =
> on; Perhaps Linux is having to read more buffers from disk than
> Windows.
>
> David.
>
>
>