Re: Handling small inserts from many connections.

On Mon, Sep 4, 2017 at 2:14 AM, 우성민 <dntjdals0513(at)gmail(dot)com> wrote:
> Hi team,
>
> I'm trying to configure postgres and pgbouncer to handle many inserts from
> many connections.
>
> Here's some details about what i want to achieve :
>
> We have more than 3000 client connections, and my server program forks
> backend process for each client connections.

This is a terrible configuration for any kind of performance. Under
load all 3,000 connections can quickly swamp your server resulting in
it slowing to a crawl.

Get a connection pooler involved. I suggest pgbouncer unless you have
very odd pooling needs. It's easy, small, and fast. Funnel those 3,000
connections down to <100 if you can. It will make a huge difference in
performance and reliability.

> System information :
> PGBouncer 1.7.2.
> PostgreSQL 9.6.3 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.4.7
> 20120313 (Red Hat 4.4.7-18), 64-bit on CentOS release 6.9 (Final).
> Kernel version 2.6.32-696.10.1.el6.x86_64
> Intel(R) Xeon(R) CPU E5-2650 0 @ 2.00GHz processor.
> 32GB ECC/REG-Buffered RAM.
> 128GB Samsung 840 evo SSD.

If it's still slow after connection pooling is setup, then look at
throwing more SSDs at the problem. If you're using a HW RAID
controller, turn off caching with SSDs unless you can prove it's
faster with it. It almost never is.