Interesting idea. How does that work in practice? If I've got 64GiB RAM, and PostgreSQL has 32GiB memory usage, and Go has 32GiB of memory.
replyIf the database requests more memory, it gets ENOMEM, but if the backend app requests more memory, it does get some more because it can overcommit?
Sounds dangerous, if the go program then writes to the overcommitted memory, you'd still trigger the OOM killer, right?
cgroups have nothing to do with overcommit and memory allocation. They limit actual memory usage for a specific program or group of programs. If this program tries to use more memory than the cgroup memory limit, the program gets OOM killed.
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