Why Doesn't My Go Code Use Multiple Cores for Parallel Processing?

Why Doesn't the Go Statement Execute in Parallel?

In your Go code, you attempt to execute the sum function concurrently using goroutines. However, you encounter the problem that only one core is utilized, despite the availability of multiple cores on your system.

To rectify this issue, you need to configure the program to allow for parallel processing. This is achieved by setting the GOMAXPROCS environment variable or using the runtime.GOMAXPROCS function to specify the number of OS threads that the runtime support can utilize.

In certain cases, increasing the value of GOMAXPROCS can actually make your program slower. This occurs when your program contains multiple goroutines that communicate frequently over channels. The context-switching penalty involved in sending data between threads becomes significant, adversely affecting performance.

Go's goroutine scheduler does not yet fully optimize the use of OS threads. However, it is expected to improve in the future to handle such cases more efficiently. Until then, it is advisable to adjust the value of GOMAXPROCS on a per-application basis to achieve optimal performance.

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