On Mon, 2021-06-14 at 18:16 +0800, Yi Sun wrote:
> After checking doc, only mentioned vm.overcommit_memory=2, but didn't mentioned vm.overcommit_ratio recommended value
> https://www.postgresql.org/docs/11/kernel-resources.html#LINUX-MEMORY-OVERCOMMIT
> some articles mentioned that 80 or 90 configuration in their env
> So is it OK just to configure vm.overcommit_ratio to 90 please?
It depends on the size of RAM and swap space:
overcommit_ratio < (RAM - swap) / RAM * 100
Here, RAM is the RAM available to PostgreSQL.
Thank you for your reply
1. Our env RAM are 4GB, 8 GB, 16 GB... as below url suggestion, could we
configure swap as below?
RAM swap
2GB – 8GB = RAM
>8GB 8GB
2GB – 8GB = RAM
>8GB 8GB
2. If the RAM is 4GB and 8GB, the formula
(RAM - swap) / RAM * 100 result will become to 0, how could we configure overcommit_ratio please?
Thank you
