How do I set GOMAXPROCS and when should I change it?

In Go, GOMAXPROCS is an environment variable that sets the maximum number of operating system threads that can execute user-level Go code simultaneously. By default, it is set to the number of CPU cores available, but you can change it based on the needs of your application.

Changing GOMAXPROCS can be beneficial in scenarios where you want to optimize the performance of your Go application, especially for CPU-bound operations. For example, if you have a multi-core processor and your application is compute-intensive, increasing GOMAXPROCS might improve performance by allowing more goroutines to run concurrently. Conversely, if your application is I/O-bound, setting it to a lower value might be more efficient.

Here is how you can set GOMAXPROCS in your Go code:

package main import ( "fmt" "runtime" ) func main() { // Set GOMAXPROCS to the number of available CPUs runtime.GOMAXPROCS(runtime.NumCPU()) fmt.Println("GOMAXPROCS set to:", runtime.GOMAXPROCS(0)) }

GOMAXPROCS Go language concurrency performance tuning CPU-bound I/O-bound

Related Questions

How do I avoid rehashing overhead with std::set in multithreaded code?

How do I find elements with custom comparators with std::set for embedded targets?

How do I erase elements while iterating with std::set for embedded targets?

How do I provide stable iteration order with std::unordered_map for large datasets?

How do I reserve capacity ahead of time with std::unordered_map for large datasets?

How do I erase elements while iterating with std::unordered_map in multithreaded code?

How do I provide stable iteration order with std::map for embedded targets?

How do I provide stable iteration order with std::map in multithreaded code?

How do I avoid rehashing overhead with std::map in performance-sensitive code?

How do I merge two containers efficiently with std::map for embedded targets?