On 3/18/23 18:02, Tomas Pospisek wrote:
> On 13.03.23 21:25, Joe Conway wrote:
>
>> Hmm, well big +1 for having swap turned on, but I recommend setting
>> "vm.overcommit_memory=2" even so.
>
> I've snipped out the context here, since my advice is very unspecific:
> do use swap only as a safety net. Once your system starts swapping
> performance goes down the toilet.
While I agree with this statement in principle, it is exactly the notion
that "once your system starts swapping performance goes down the toilet"
that leads people to conclude that having lots of memory and disabling
swap will solve all their problems.
Because of how the Linux kernel works, you should, IMHO, always have
some swap available. For more on why, see:
https://chrisdown.name/2018/01/02/in-defence-of-swap.html
--
Joe Conway
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com
