Memory settings

Hi team,

Can you please suggest what will be the suitable memory settings for Postgresql11 if we have 80gb RAM, 16 CPU's and OS Linux.

If we set 25 % of total RAM then shared_buffers value will be 20GB. Will it be useful or we can set it any random vale like 8g or 12gb.

According to https://pgtune.leopard.in.ua/#/
below are the suggested memory values for 80gb RAM and 16 CPU. I assume the values preferred for effective_cache_size = 60GB and shared_buffers = 20GB are too large.

max_connections = 500
shared_buffers = 20GB
effective_cache_size = 60GB
maintenance_work_mem = 2GB
checkpoint_completion_target = 0.7
wal_buffers = 16MB
default_statistics_target = 100
random_page_cost = 1.1
effective_io_concurrency = 300
work_mem = 6553kB
min_wal_size = 1GB
max_wal_size = 2GB
max_worker_processes = 16
max_parallel_workers_per_gather = 8
max_parallel_workers = 16

Please give your suggestions.

Regards,
Daulat