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print.go
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print.go
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// Copyright 2014 Google Inc. All Rights Reserved.
//
// 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.
/*
Hey supports two output formats: summary and CSV
The summary output presents a number of statistics about the requests in a
human-readable format, including:
- general statistics: requests/second, total runtime, and average, fastest, and slowest requests.
- a response time histogram.
- a percentile latency distribution.
- statistics (average, fastest, slowest) on the stages of the requests.
The comma-separated CSV format is proceeded by a header, and consists of the following columns:
1. response-time: Total time taken for request (in seconds)
2. DNS+dialup: Time taken to establish the TCP connection (in seconds)
3. DNS: Time taken to do the DNS lookup (in seconds)
4. Request-write: Time taken to write full request (in seconds)
5. Response-delay: Time taken to first byte received (in seconds)
6. Response-read: Time taken to read full response (in seconds)
7. status-code: HTTP status code of the response (e.g. 200)
8. offset: The time since the start of the benchmark when the request was started. (in seconds)
*/
package requester
import (
"bytes"
"encoding/json"
"fmt"
"strings"
"text/template"
)
func newTemplate(output string) *template.Template {
outputTmpl := output
switch outputTmpl {
case "":
outputTmpl = defaultTmpl
case "csv":
outputTmpl = csvTmpl
}
return template.Must(template.New("tmpl").Funcs(tmplFuncMap).Parse(outputTmpl))
}
var tmplFuncMap = template.FuncMap{
"formatNumber": formatNumber,
"formatNumberInt": formatNumberInt,
"histogram": histogram,
"jsonify": jsonify,
}
func jsonify(v interface{}) string {
d, _ := json.Marshal(v)
return string(d)
}
func formatNumber(duration float64) string {
return fmt.Sprintf("%4.4f", duration)
}
func formatNumberInt(duration int) string {
return fmt.Sprintf("%d", duration)
}
func histogram(buckets []Bucket) string {
max := 0
for _, b := range buckets {
if v := b.Count; v > max {
max = v
}
}
res := new(bytes.Buffer)
for i := 0; i < len(buckets); i++ {
// Normalize bar lengths.
var barLen int
if max > 0 {
barLen = (buckets[i].Count*40 + max/2) / max
}
res.WriteString(fmt.Sprintf(" %4.3f [%v]\t|%v\n", buckets[i].Mark, buckets[i].Count, strings.Repeat(barChar, barLen)))
}
return res.String()
}
var (
defaultTmpl = `
Summary:
Total: {{ formatNumber .Total.Seconds }} secs
Slowest: {{ formatNumber .Slowest }} secs
Fastest: {{ formatNumber .Fastest }} secs
Average: {{ formatNumber .Average }} secs
Requests/sec: {{ formatNumber .Rps }}
{{ if gt .SizeTotal 0 }}
Total data: {{ .SizeTotal }} bytes
Size/request: {{ .SizeReq }} bytes{{ end }}
Response time histogram:
{{ histogram .Histogram }}
Latency distribution:{{ range .LatencyDistribution }}
{{ .Percentage }}%% in {{ formatNumber .Latency }} secs{{ end }}
Details (average, fastest, slowest):
DNS+dialup: {{ formatNumber .AvgConn }} secs, {{ formatNumber .Fastest }} secs, {{ formatNumber .Slowest }} secs
DNS-lookup: {{ formatNumber .AvgDNS }} secs, {{ formatNumber .DnsMax }} secs, {{ formatNumber .DnsMin }} secs
req write: {{ formatNumber .AvgReq }} secs, {{ formatNumber .ReqMax }} secs, {{ formatNumber .ReqMin }} secs
resp wait: {{ formatNumber .AvgDelay }} secs, {{ formatNumber .DelayMax }} secs, {{ formatNumber .DelayMin }} secs
resp read: {{ formatNumber .AvgRes }} secs, {{ formatNumber .ResMax }} secs, {{ formatNumber .ResMin }} secs
Status code distribution:{{ range $code, $num := .StatusCodeDist }}
[{{ $code }}] {{ $num }} responses{{ end }}
{{ if gt (len .ErrorDist) 0 }}Error distribution:{{ range $err, $num := .ErrorDist }}
[{{ $num }}] {{ $err }}{{ end }}{{ end }}
`
csvTmpl = `{{ $connLats := .ConnLats }}{{ $dnsLats := .DnsLats }}{{ $dnsLats := .DnsLats }}{{ $reqLats := .ReqLats }}{{ $delayLats := .DelayLats }}{{ $resLats := .ResLats }}{{ $statusCodeLats := .StatusCodes }}{{ $offsets := .Offsets}}response-time,DNS+dialup,DNS,Request-write,Response-delay,Response-read,status-code,offset{{ range $i, $v := .Lats }}
{{ formatNumber $v }},{{ formatNumber (index $connLats $i) }},{{ formatNumber (index $dnsLats $i) }},{{ formatNumber (index $reqLats $i) }},{{ formatNumber (index $delayLats $i) }},{{ formatNumber (index $resLats $i) }},{{ formatNumberInt (index $statusCodeLats $i) }},{{ formatNumber (index $offsets $i) }}{{ end }}`
)