Benchmarking code with a StopWatch or similar

I'm trying to use Go package "time" to benchmark a function in my program. Been searching around, and people seem to use time.NanoSeconds() - but I think this function is no longer in the time package?

What I need is an easy way to start and stop a timer, and print out the value.

Use the existing functionality of the testing package inside your *_test.go:

func BenchmarkMyFunc(b *testing.B) {
    for i := 0; i < b.N; i++ {

and invoke go test -bench RE (RE is a regexp to select the benches, like B as it means *B* ) typically inside the package/tool directory

Or explicitly from any place in your code - use the Benchmark function.


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