Performance and Benchmarking Basics

Benchmark Table

Go benchmarks produce rows that compare operations with numbers such as nanoseconds per operation.

benchmark result Static examples can model benchmark output as data so the lesson explains interpretation without timing the host machine.

Benchmark Table

nsOp
benchmark_table.go
Replay: real traced execution (multi-file project)
package main

import "fmt"

type BenchRow struct {
	Name   string
	NsOp   int
	Allocs int
}

func main() {
	var nsOp = 80
	row := BenchRow{Name: "BenchmarkLookup", NsOp: nsOp, Allocs: 0}
	fastEnough := row.NsOp <= 100
	allocationFree := row.Allocs == 0

	fmt.Println("name=", row.Name)
	fmt.Println("ns_per_op=", row.NsOp)
	fmt.Println("allocs=", row.Allocs)
	fmt.Println("fast_enough=", fastEnough)
	fmt.Println("allocation_free=", allocationFree)
}

package main

import "fmt"

type BenchRow struct {
	Name   string
	NsOp   int
	Allocs int
}

func main() {
	var nsOp = 40
	row := BenchRow{Name: "BenchmarkLookup", NsOp: nsOp, Allocs: 0}
	fastEnough := row.NsOp <= 100
	allocationFree := row.Allocs == 0

	fmt.Println("name=", row.Name)
	fmt.Println("ns_per_op=", row.NsOp)
	fmt.Println("allocs=", row.Allocs)
	fmt.Println("fast_enough=", fastEnough)
	fmt.Println("allocation_free=", allocationFree)
}

package main

import "fmt"

type BenchRow struct {
	Name   string
	NsOp   int
	Allocs int
}

func main() {
	var nsOp = 120
	row := BenchRow{Name: "BenchmarkLookup", NsOp: nsOp, Allocs: 0}
	fastEnough := row.NsOp <= 100
	allocationFree := row.Allocs == 0

	fmt.Println("name=", row.Name)
	fmt.Println("ns_per_op=", row.NsOp)
	fmt.Println("allocs=", row.Allocs)
	fmt.Println("fast_enough=", fastEnough)
	fmt.Println("allocation_free=", allocationFree)
}

  1. nsOp ← 80, row ← main.BenchRow{Name:"BenchmarkLookup", NsOp:80, Allocs:0}

    11func main() {12  var nsOp→ 80 = 80 //@nsOp=40, 12013  row→ main.BenchRow{Name:"BenchmarkLookup", NsOp:80, Allocs:0} := BenchRow{Name: "BenchmarkLookup", NsOp: nsOp80, Allocs: 0}14  fastEnough→ true := row.NsOp80 <= 10015  allocationFree→ true := row.Allocs0 == 01617  fmt.Println("name=", row.Name"BenchmarkLookup")18  fmt.Println("ns_per_op=", row.NsOp80)19  fmt.Println("allocs=", row.Allocs0)20  fmt.Println("fast_enough=", fastEnoughtrue)21  fmt.Println("allocation_free=", allocationFreetrue)22}
    outputname= BenchmarkLookup
ns_per_op= 80
allocs= 0
fast_enough= true
allocation_free= true

  1. nsOp ← 40, row ← main.BenchRow{Name:"BenchmarkLookup", NsOp:40, Allocs:0}

    11func main() {12  var nsOp→ 40 = 4013  row→ main.BenchRow{Name:"BenchmarkLookup", NsOp:40, Allocs:0} := BenchRow{Name: "BenchmarkLookup", NsOp: nsOp40, Allocs: 0}14  fastEnough→ true := row.NsOp40 <= 10015  allocationFree→ true := row.Allocs0 == 01617  fmt.Println("name=", row.Name"BenchmarkLookup")18  fmt.Println("ns_per_op=", row.NsOp40)19  fmt.Println("allocs=", row.Allocs0)20  fmt.Println("fast_enough=", fastEnoughtrue)21  fmt.Println("allocation_free=", allocationFreetrue)22}
    outputname= BenchmarkLookup
ns_per_op= 40
allocs= 0
fast_enough= true
allocation_free= true

  1. nsOp ← 120, row ← main.BenchRow{Name:"BenchmarkLookup", NsOp:120, Allocs:0}

    11func main() {12  var nsOp→ 120 = 12013  row→ main.BenchRow{Name:"BenchmarkLookup", NsOp:120, Allocs:0} := BenchRow{Name: "BenchmarkLookup", NsOp: nsOp120, Allocs: 0}14  fastEnough→ false := row.NsOp120 <= 10015  allocationFree→ true := row.Allocs0 == 01617  fmt.Println("name=", row.Name"BenchmarkLookup")18  fmt.Println("ns_per_op=", row.NsOp120)19  fmt.Println("allocs=", row.Allocs0)20  fmt.Println("fast_enough=", fastEnoughfalse)21  fmt.Println("allocation_free=", allocationFreetrue)22}
    outputname= BenchmarkLookup
ns_per_op= 120
allocs= 0
fast_enough= false
allocation_free= true