This package was inspired by Brian W. Kernighan and Rob Pike's book "The Practice of Programming" (Addison-Wesley, 1999). In Chapter 7 on performance, section 7.6 (Estimation):
"It's hard to estimate ahead of time how fast a program will be [...]. It's easy, though, to create a cost model for a language or a system, which will give you at least a rough idea of how long important operations take."
This is a cost model that benchmarks common basic operations for the Go language. For it to be meaningful, it should be run on your target hardware, and the relative performance of operations is probably more important than the actual numbers. Examples of such results on a variety of hardware is available in the bench/ folder.
There may be places where compiler optimizations render some benchmarks moot. If you find any such occurrences, please open an issue or send a pull request.
The names of the *_test.go source files should give an idea of the category of operations that are benchmarked.
Here is a short example of benchmark results, run on a Toshiba Chromebook 64-bit running Ubuntu (LXDE) with crouton:
BenchmarkConvIntToFloat64 1000000000 2.16 ns/op 0 B/op 0 allocs/op
BenchmarkConvFloat64ToInt 2000000000 1.26 ns/op 0 B/op 0 allocs/op
BenchmarkConvIntToFloat32 2000000000 1.44 ns/op 0 B/op 0 allocs/op
BenchmarkConvFloat32ToInt 2000000000 1.42 ns/op 0 B/op 0 allocs/op
BenchmarkConvStringToInt 30000000 57.8 ns/op 0 B/op 0 allocs/op
BenchmarkConvIntToString 20000000 108 ns/op 1 B/op 1 allocs/op
BenchmarkStringToByte 20000000 110 ns/op 8 B/op 1 allocs/op
BenchmarkByteToString 20000000 84.8 ns/op 4 B/op 1 allocs/op
BenchmarkFindSliceInt5 100000000 13.0 ns/op 0 B/op 0 allocs/op
BenchmarkFindSliceStr5 20000000 64.9 ns/op 0 B/op 0 allocs/op
BenchmarkFindSliceInt100 10000000 236 ns/op 0 B/op 0 allocs/op
BenchmarkFindSliceStr100 1000000 1248 ns/op 0 B/op 0 allocs/op
BenchmarkFindMapInt5 100000000 22.2 ns/op 0 B/op 0 allocs/op
BenchmarkFindMapStr5 20000000 77.6 ns/op 0 B/op 0 allocs/op
BenchmarkFindMapInt100 30000000 58.3 ns/op 0 B/op 0 allocs/op
BenchmarkFindMapStr100 20000000 76.2 ns/op 0 B/op 0 allocs/op
BenchmarkFloat32Assign 2000000000 0.99 ns/op 0 B/op 0 allocs/op
$ go get github.com/PuerkitoBio/gocostmodel
$ go test -run zz -bench . [-benchmem]
Pull requests are welcome, but the benchmarks should be for common basic operations, in the spirit of the existing benchmarks.
This source code is released under the BSD 3-clause license.