How to test only one benchmark function?

Question

In my Go package there are several benchmark files like map1_benchmark_test.go and map2_benchmark_test.go. In every *_benchmark_test.go file, there is more than one benchmark function like func BenchmarkMapTravel(b *testing.B) and func BenchmarkMapGet(b *testing.B).

Question is, how can I test just one benchmark function?

I attempted to read some manuals, and got nothing about benchmark by running go help test.

Answer 1

Description of testing flags

-test.bench pattern     Run benchmarks matching the regular expression.     By default, no benchmarks run.  -test.run pattern     Run only those tests and examples matching the regular     expression. 

For convenience, each of these -test.X flags of the test binary is also available as the flag -X in 'go test' itself.

For help,

$ go help testflag 

For example,

go test -test.bench MapTravel go test -test.bench MapGet 

or

go test -bench MapTravel go test -bench MapGet 

To bypass test functions, include a -test.run pattern that filters out every single test. For example,

go test -test.bench MapTravel -test.run=thisexpressionwontmatchanytest 

or

go test -bench MapTravel -run=^$