mirror of https://github.com/tidwall/tile38.git
108 lines
2.3 KiB
Go
108 lines
2.3 KiB
Go
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package lotsa
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import (
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"fmt"
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"io"
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"runtime"
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"sync"
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"time"
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)
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// Output is used to print elased time and ops/sec
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var Output io.Writer
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// MemUsage is used to output the memory usage
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var MemUsage bool
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// Ops executed a number of operations over a multiple goroutines.
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// count is the number of operations.
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// threads is the number goroutines.
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// op is the operation function
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func Ops(count, threads int, op func(i, thread int)) {
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var start time.Time
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var wg sync.WaitGroup
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wg.Add(threads)
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var ms1 runtime.MemStats
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output := Output
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if output != nil {
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if MemUsage {
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runtime.GC()
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runtime.ReadMemStats(&ms1)
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}
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start = time.Now()
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}
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for i := 0; i < threads; i++ {
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s, e := count/threads*i, count/threads*(i+1)
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if i == threads-1 {
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e = count
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}
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go func(i, s, e int) {
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defer wg.Done()
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for j := s; j < e; j++ {
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op(j, i)
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}
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}(i, s, e)
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}
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wg.Wait()
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if output != nil {
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dur := time.Since(start)
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var alloc uint64
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if MemUsage {
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var ms2 runtime.MemStats
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runtime.ReadMemStats(&ms2)
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alloc = ms2.HeapAlloc - ms1.HeapAlloc
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}
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WriteOutput(output, count, threads, dur, alloc)
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}
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}
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func commaize(n int) string {
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s1, s2 := fmt.Sprintf("%d", n), ""
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for i, j := len(s1)-1, 0; i >= 0; i, j = i-1, j+1 {
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if j%3 == 0 && j != 0 {
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s2 = "," + s2
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}
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s2 = string(s1[i]) + s2
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}
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return s2
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}
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func memstr(alloc uint64) string {
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switch {
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case alloc <= 1024:
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return fmt.Sprintf("%d bytes", alloc)
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case alloc <= 1024*1024:
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return fmt.Sprintf("%.1f KB", float64(alloc)/1024)
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case alloc <= 1024*1024*1024:
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return fmt.Sprintf("%.1f MB", float64(alloc)/1024/1024)
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default:
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return fmt.Sprintf("%.1f GB", float64(alloc)/1024/1024/1024)
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}
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}
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// WriteOutput writes an output line to the specified writer
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func WriteOutput(w io.Writer, count, threads int, elapsed time.Duration, alloc uint64) {
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var ss string
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if threads != 1 {
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ss = fmt.Sprintf("over %d threads ", threads)
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}
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var nsop int
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if count > 0 {
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nsop = int(elapsed / time.Duration(count))
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}
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var allocstr string
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if alloc > 0 {
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var bops uint64
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if count > 0 {
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bops = alloc / uint64(count)
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}
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allocstr = fmt.Sprintf(", %s, %d bytes/op", memstr(alloc), bops)
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}
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fmt.Fprintf(w, "%s ops %sin %.0fms, %s/sec, %d ns/op%s\n",
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commaize(count), ss, elapsed.Seconds()*1000,
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commaize(int(float64(count)/elapsed.Seconds())),
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nsop, allocstr,
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)
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}
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