What is the maximum number of goroutines that can run simultaneously in your application?

Go does not have a strict limit on the number of goroutines that can run simultaneously. Theoretically, there can be many — tens or hundreds of thousands, and sometimes even millions, if there is enough memory and OS resources. However, in practice, the maximum number depends on available memory, load, and application architecture.

Goroutines are lightweight, but each requires a small stack (by default about 2 KB), which can grow dynamically. If too many goroutines are created, it can exhaust memory or lead to performance degradation due to context switching.

It is recommended to base the number of goroutines on the actual needs of the application and profile their usage to avoid excessive creation. For example, a network server with many connections often creates one goroutine per connection, which can be tens of thousands of goroutines without issues.