Golang - go run takes long to execute

Question

I have a little problem, where every time I run 'go run >filename<' after making changes to my problem, it takes many seconds to start executing.

I tried it with a simple program like this:

package main

import "fmt"

func main() {
    fmt.Println("Output")
}

And it took about 18 seconds to print out the result.

And ideas on what could cause this problem?

I am on windows by the way.

Thanks in Advance

Answer 1

Found this while experiencing an identical issue with freshly-compiled golang binaries on MacOS (OSX) Catalina.

In short, the OS now scans a new (to it) binary for malware, it usually does it on first start, but I found that it was doing it 3-5 times in a row, after which the binary got whitelisted and started as normal. Obviously, once you make changes to the code and re-compile the scans start happening again. The scan would take upwards of 20 seconds which ruined golangs fast iteration cycle.

Solution for me was as follows:

sudo spctl developer-mode enable-terminal

Then go to Preferences -> Security & Privacy -> Privacy

In the list to the left you will now have "Developer Tools" section, which will have OSX built-in Terminal listed. Check the box to enable it, and/or add anything else you may be using to develop (iTerm, VS Code, etc)

When running binaries from those applications the scans stop and things go back to normal.