Imported Upstream version 60

1 files changed, 0 insertions, 92 deletions

diff --git a/src/pkg/big/calibrate_test.go b/src/pkg/big/calibrate_test.go
deleted file mode 100644
index c6cd2e693..000000000
--- a/src/pkg/big/calibrate_test.go
+++ /dev/null
@@ -1,92 +0,0 @@
-// Copyright 2009 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.
-
-// This file prints execution times for the Mul benchmark
-// given different Karatsuba thresholds. The result may be
-// used to manually fine-tune the threshold constant. The
-// results are somewhat fragile; use repeated runs to get
-// a clear picture.
-
-// Usage: gotest -calibrate
-
-package big
-
-import (
-	"flag"
-	"fmt"
-	"testing"
-	"time"
-)
-
-
-var calibrate = flag.Bool("calibrate", false, "run calibration test")
-
-
-// measure returns the time to run f
-func measure(f func()) int64 {
-	const N = 100
-	start := time.Nanoseconds()
-	for i := N; i > 0; i-- {
-		f()
-	}
-	stop := time.Nanoseconds()
-	return (stop - start) / N
-}
-
-
-func computeThresholds() {
-	fmt.Printf("Multiplication times for varying Karatsuba thresholds\n")
-	fmt.Printf("(run repeatedly for good results)\n")
-
-	// determine Tk, the work load execution time using basic multiplication
-	karatsubaThreshold = 1e9 // disable karatsuba
-	Tb := measure(benchmarkMulLoad)
-	fmt.Printf("Tb = %dns\n", Tb)
-
-	// thresholds
-	n := 8 // any lower values for the threshold lead to very slow multiplies
-	th1 := -1
-	th2 := -1
-
-	var deltaOld int64
-	for count := -1; count != 0; count-- {
-		// determine Tk, the work load execution time using Karatsuba multiplication
-		karatsubaThreshold = n // enable karatsuba
-		Tk := measure(benchmarkMulLoad)
-
-		// improvement over Tb
-		delta := (Tb - Tk) * 100 / Tb
-
-		fmt.Printf("n = %3d  Tk = %8dns  %4d%%", n, Tk, delta)
-
-		// determine break-even point
-		if Tk < Tb && th1 < 0 {
-			th1 = n
-			fmt.Print("  break-even point")
-		}
-
-		// determine diminishing return
-		if 0 < delta && delta < deltaOld && th2 < 0 {
-			th2 = n
-			fmt.Print("  diminishing return")
-		}
-		deltaOld = delta
-
-		fmt.Println()
-
-		// trigger counter
-		if th1 >= 0 && th2 >= 0 && count < 0 {
-			count = 20 // this many extra measurements after we got both thresholds
-		}
-
-		n++
-	}
-}
-
-
-func TestCalibrate(t *testing.T) {
-	if *calibrate {
-		computeThresholds()
-	}
-}