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// run //go:build darwin || linux // Copyright 2013 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Test that maps don't go quadratic for NaNs and other values. package main import ( "fmt" "math" "time" ) // checkLinear asserts that the running time of f(n) is in O(n). // tries is the initial number of iterations. func checkLinear(typ string, tries int, f func(n int)) { // Depending on the machine and OS, this test might be too fast // to measure with accurate enough granularity. On failure, // make it run longer, hoping that the timing granularity // is eventually sufficient. timeF := func(n int) time.Duration { t1 := time.Now() f(n) return time.Since(t1) } t0 := time.Now() n := tries fails := 0 for { t1 := timeF(n) t2 := timeF(2 * n) // should be 2x (linear); allow up to 3x if t2 < 3*t1 { if false { fmt.Println(typ, "\t", time.Since(t0)) } return } // If n ops run in under a second and the ratio // doesn't work out, make n bigger, trying to reduce // the effect that a constant amount of overhead has // on the computed ratio. if t1 < 1*time.Second { n *= 2 continue } // Once the test runs long enough for n ops, // try to get the right ratio at least once. // If five in a row all fail, give up. if fails++; fails >= 5 { panic(fmt.Sprintf("%s: too slow: %d inserts: %v; %d inserts: %v\n", typ, n, t1, 2*n, t2)) } } } type I interface { f() } type C int func (C) f() {} func main() { // NaNs. ~31ms on a 1.6GHz Zeon. checkLinear("NaN", 30000, func(n int) { m := map[float64]int{} nan := math.NaN() for i := 0; i < n; i++ { m[nan] = 1 } if len(m) != n { panic("wrong size map after nan insertion") } }) // ~6ms on a 1.6GHz Zeon. checkLinear("eface", 10000, func(n int) { m := map[interface{}]int{} for i := 0; i < n; i++ { m[i] = 1 } }) // ~7ms on a 1.6GHz Zeon. // Regression test for CL 119360043. checkLinear("iface", 10000, func(n int) { m := map[I]int{} for i := 0; i < n; i++ { m[C(i)] = 1 } }) // ~6ms on a 1.6GHz Zeon. checkLinear("int", 10000, func(n int) { m := map[int]int{} for i := 0; i < n; i++ { m[i] = 1 } }) // ~18ms on a 1.6GHz Zeon. checkLinear("string", 10000, func(n int) { m := map[string]int{} for i := 0; i < n; i++ { m[fmt.Sprint(i)] = 1 } }) // ~6ms on a 1.6GHz Zeon. checkLinear("float32", 10000, func(n int) { m := map[float32]int{} for i := 0; i < n; i++ { m[float32(i)] = 1 } }) // ~6ms on a 1.6GHz Zeon. checkLinear("float64", 10000, func(n int) { m := map[float64]int{} for i := 0; i < n; i++ { m[float64(i)] = 1 } }) // ~22ms on a 1.6GHz Zeon. checkLinear("complex64", 10000, func(n int) { m := map[complex64]int{} for i := 0; i < n; i++ { m[complex(float32(i), float32(i))] = 1 } }) // ~32ms on a 1.6GHz Zeon. checkLinear("complex128", 10000, func(n int) { m := map[complex128]int{} for i := 0; i < n; i++ { m[complex(float64(i), float64(i))] = 1 } }) // ~70ms on a 1.6GHz Zeon. // The iterate/delete idiom currently takes expected // O(n lg n) time. Fortunately, the checkLinear test // leaves enough wiggle room to include n lg n time // (it actually tests for O(n^log_2(3)). // To prevent false positives, average away variation // by doing multiple rounds within a single run. checkLinear("iterdelete", 2500, func(n int) { for round := 0; round < 4; round++ { m := map[int]int{} for i := 0; i < n; i++ { m[i] = i } for i := 0; i < n; i++ { for k := range m { delete(m, k) break } } } }) }