Created
March 30, 2023 07:42
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int map vs *int map
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| $ gotest -v ./ -bench=Benchmark -test.run=^$ -benchtime=100000000x | |
| goos: linux | |
| goarch: amd64 | |
| pkg: maptest | |
| cpu: 11th Gen Intel(R) Core(TM) i7-1185G7 @ 3.00GHz | |
| BenchmarkIntMap | |
| BenchmarkIntMap-8 100000000 55.85 ns/op 0 B/op 0 allocs/op | |
| BenchmarkIntPointerMap | |
| BenchmarkIntPointerMap-8 100000000 24.43 ns/op 0 B/op 0 allocs/op |
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| package main | |
| type mapType interface { | |
| Inc(string) int | |
| Dec(string) int | |
| } | |
| type intPointerMap map[string]*int | |
| func (tqs intPointerMap) Inc(tenant string) int { | |
| ptr, ok := tqs[tenant] | |
| if !ok { | |
| size := 1 | |
| tqs[tenant] = &size | |
| return size | |
| } | |
| (*ptr)++ | |
| return *ptr | |
| } | |
| func (tqs intPointerMap) Dec(tenant string) int { | |
| ptr, ok := tqs[tenant] | |
| if !ok { | |
| return 0 | |
| } | |
| (*ptr)-- | |
| if *ptr == 0 { | |
| delete(tqs, tenant) | |
| } | |
| return *ptr | |
| } | |
| type intMap map[string]int | |
| func (tqs intMap) Inc(tenant string) int { | |
| ptr, ok := tqs[tenant] | |
| if !ok { | |
| tqs[tenant] = 1 | |
| return 1 | |
| } | |
| ptr++ | |
| tqs[tenant] = ptr | |
| return ptr | |
| } | |
| func (tqs intMap) Dec(tenant string) int { | |
| ptr, ok := tqs[tenant] | |
| if !ok { | |
| return 0 | |
| } | |
| ptr-- | |
| if ptr == 0 { | |
| delete(tqs, tenant) | |
| } else { | |
| tqs[tenant] = ptr | |
| } | |
| return ptr | |
| } |
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| package main | |
| import "testing" | |
| func BenchmarkIntMap(b *testing.B) { | |
| m := make(intMap) | |
| benchmarkMap(b, m) | |
| } | |
| func BenchmarkIntPointerMap(b *testing.B) { | |
| m := make(intPointerMap) | |
| benchmarkMap(b, m) | |
| } | |
| func benchmarkMap(b *testing.B, m mapType) { | |
| b.ReportAllocs() | |
| for i := 0; i < b.N; i++ { | |
| m.Inc("a") | |
| m.Inc("b") | |
| } | |
| for i := 0; i < b.N; i++ { | |
| m.Dec("b") | |
| m.Dec("a") | |
| } | |
| } |
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