How to calculate approximate iops for a specific ssd under the database?

Question

Solid State Drives

Let's say we have Samsung 960 PRO 1 TB,
We have PostgresDB 10,
We have I / O operations declared by the manufacturer at the level of 440,000/360,000 IOPS.

Answer 1

The essence of the question is not clear.
What is there to count?
Specifications declared by the manufacturer can be viewed on the website.
How it behaves under a specific load must be measured under this load itself.