I had a php application last year that was working on shared hosting that has 1 GB RAM and 1 CPU core. At the time, there were 200 users using the service and the performance was perfectly fine. However, this year in the same event with same number of users, I have exactly the same code on VPS with 3 GB RAM and 3 CPU cores, but the server crashes which drove me crazy.
My question is: is there any tool or technology that can simulate a specific number of users access the same website at the same time to mimic the actual event beforehand.
Thank you
