Make random example more interesting.
Have different RPC rates for the three services and vary them according to a diurnal period.
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@ -18,6 +18,7 @@ package main
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import (
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import (
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"flag"
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"flag"
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"math"
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"math/rand"
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"math/rand"
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"net/http"
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"net/http"
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"time"
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"time"
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@ -26,10 +27,11 @@ import (
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)
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)
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var (
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var (
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addr = flag.String("listen-address", ":8080", "The address to listen on for HTTP requests.")
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addr = flag.String("listen-address", ":8080", "The address to listen on for HTTP requests.")
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uniformDomain = flag.Float64("random.uniform.domain", 200, "The domain for the uniform distribution.")
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uniformDomain = flag.Float64("uniform.domain", 200, "The domain for the uniform distribution.")
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normDomain = flag.Float64("random.exponential.domain", 200, "The domain for the normal distribution.")
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normDomain = flag.Float64("exponential.domain", 200, "The domain for the normal distribution.")
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normMean = flag.Float64("random.exponential.mean", 10, "The mean for the normal distribution.")
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normMean = flag.Float64("exponential.mean", 10, "The mean for the normal distribution.")
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oscillationPeriod = flag.Duration("oscillation-period", 10*time.Minute, "The duration of the rate oscillation period.")
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)
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)
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var (
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var (
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@ -53,14 +55,31 @@ func init() {
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func main() {
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func main() {
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flag.Parse()
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flag.Parse()
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start := time.Now()
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oscillationFactor := func() float64 {
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return 2 + math.Sin(math.Sin(2*math.Pi*float64(time.Since(start))/float64(*oscillationPeriod)))
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}
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// Periodically record some sample latencies for the three services.
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go func() {
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go func() {
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for {
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for {
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// Periodically record some sample latencies for the three services.
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rpcDurations.WithLabelValues("uniform").Observe(rand.Float64() * *uniformDomain)
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rpcDurations.WithLabelValues("uniform").Observe(rand.Float64() * *uniformDomain)
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rpcDurations.WithLabelValues("normal").Observe((rand.NormFloat64() * *normDomain) + *normMean)
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time.Sleep(time.Duration(100*oscillationFactor()) * time.Millisecond)
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rpcDurations.WithLabelValues("exponential").Observe(rand.ExpFloat64())
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}
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}()
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time.Sleep(100 * time.Millisecond)
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go func() {
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for {
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rpcDurations.WithLabelValues("normal").Observe((rand.NormFloat64() * *normDomain) + *normMean)
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time.Sleep(time.Duration(75*oscillationFactor()) * time.Millisecond)
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}
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}()
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go func() {
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for {
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rpcDurations.WithLabelValues("exponential").Observe(rand.ExpFloat64())
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time.Sleep(time.Duration(50*oscillationFactor()) * time.Millisecond)
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}
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}
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}()
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}()
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