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- // Copyright 2016 The etcd Authors
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
- package report
- import (
- "bytes"
- "encoding/csv"
- "fmt"
- "log"
- "math"
- "sort"
- "sync"
- "time"
- )
- type DataPoint struct {
- Timestamp int64
- MinLatency time.Duration
- AvgLatency time.Duration
- MaxLatency time.Duration
- ThroughPut int64
- }
- type TimeSeries []DataPoint
- func (t TimeSeries) Swap(i, j int) { t[i], t[j] = t[j], t[i] }
- func (t TimeSeries) Len() int { return len(t) }
- func (t TimeSeries) Less(i, j int) bool { return t[i].Timestamp < t[j].Timestamp }
- type secondPoint struct {
- minLatency time.Duration
- maxLatency time.Duration
- totalLatency time.Duration
- count int64
- }
- type secondPoints struct {
- mu sync.Mutex
- tm map[int64]secondPoint
- }
- func newSecondPoints() *secondPoints {
- return &secondPoints{tm: make(map[int64]secondPoint)}
- }
- func (sp *secondPoints) Add(ts time.Time, lat time.Duration) {
- sp.mu.Lock()
- defer sp.mu.Unlock()
- tk := ts.Unix()
- if v, ok := sp.tm[tk]; !ok {
- sp.tm[tk] = secondPoint{minLatency: lat, maxLatency: lat, totalLatency: lat, count: 1}
- } else {
- if lat != time.Duration(0) {
- v.minLatency = minDuration(v.minLatency, lat)
- }
- v.maxLatency = maxDuration(v.maxLatency, lat)
- v.totalLatency += lat
- v.count++
- sp.tm[tk] = v
- }
- }
- func (sp *secondPoints) getTimeSeries() TimeSeries {
- sp.mu.Lock()
- defer sp.mu.Unlock()
- var (
- minTs int64 = math.MaxInt64
- maxTs int64 = -1
- )
- for k := range sp.tm {
- if minTs > k {
- minTs = k
- }
- if maxTs < k {
- maxTs = k
- }
- }
- for ti := minTs; ti < maxTs; ti++ {
- if _, ok := sp.tm[ti]; !ok { // fill-in empties
- sp.tm[ti] = secondPoint{totalLatency: 0, count: 0}
- }
- }
- var (
- tslice = make(TimeSeries, len(sp.tm))
- i int
- )
- for k, v := range sp.tm {
- var lat time.Duration
- if v.count > 0 {
- lat = v.totalLatency / time.Duration(v.count)
- }
- tslice[i] = DataPoint{
- Timestamp: k,
- MinLatency: v.minLatency,
- AvgLatency: lat,
- MaxLatency: v.maxLatency,
- ThroughPut: v.count,
- }
- i++
- }
- sort.Sort(tslice)
- return tslice
- }
- func (t TimeSeries) String() string {
- buf := new(bytes.Buffer)
- wr := csv.NewWriter(buf)
- if err := wr.Write([]string{"UNIX-SECOND", "MIN-LATENCY-MS", "AVG-LATENCY-MS", "MAX-LATENCY-MS", "AVG-THROUGHPUT"}); err != nil {
- log.Fatal(err)
- }
- rows := [][]string{}
- for i := range t {
- row := []string{
- fmt.Sprintf("%d", t[i].Timestamp),
- t[i].MinLatency.String(),
- t[i].AvgLatency.String(),
- t[i].MaxLatency.String(),
- fmt.Sprintf("%d", t[i].ThroughPut),
- }
- rows = append(rows, row)
- }
- if err := wr.WriteAll(rows); err != nil {
- log.Fatal(err)
- }
- wr.Flush()
- if err := wr.Error(); err != nil {
- log.Fatal(err)
- }
- return fmt.Sprintf("\nSample in one second (unix latency throughput):\n%s", buf.String())
- }
- func minDuration(a, b time.Duration) time.Duration {
- if a < b {
- return a
- }
- return b
- }
- func maxDuration(a, b time.Duration) time.Duration {
- if a > b {
- return a
- }
- return b
- }
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