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package main
import (
"flag"
"fmt"
"os"
"strings"
"text/tabwriter"
"time"
metrics "github.com/rcrowley/go-metrics"
tmtypes "github.com/tendermint/tendermint/types"
"github.com/tendermint/tools/tm-monitor/monitor"
)
var version = "0.1.0.pre"
type statistics struct {
BlockTimeSample metrics.Histogram
TxThroughputSample metrics.Histogram
BlockLatency metrics.Histogram
}
func main() {
var duration, txsRate, connections int
flag.IntVar(&connections, "c", 1, "Connections to keep open per endpoint")
flag.IntVar(&duration, "T", 10, "Exit after the specified amount of time in seconds")
flag.IntVar(&txsRate, "r", 1000, "Txs per second to send in a connection")
flag.Usage = func() {
fmt.Println(`Tendermint blockchain benchmarking tool.
Usage:
tm-bench [-c 1] [-T 10] [-r 1000] [endpoints]
Examples:
tm-bench localhost:46657`)
fmt.Println("Flags:")
flag.PrintDefaults()
}
flag.Parse()
if flag.NArg() == 0 {
flag.Usage()
os.Exit(1)
}
fmt.Printf("Running %ds test @ %s\n", duration, flag.Arg(0))
endpoints := strings.Split(flag.Arg(0), ",")
blockCh := make(chan tmtypes.Header, 100)
blockLatencyCh := make(chan float64, 100)
nodes := startNodes(endpoints, blockCh, blockLatencyCh)
transacters := startTransacters(endpoints, connections, txsRate)
stats := &statistics{
BlockTimeSample: metrics.NewHistogram(metrics.NewUniformSample(1000)),
TxThroughputSample: metrics.NewHistogram(metrics.NewUniformSample(1000)),
BlockLatency: metrics.NewHistogram(metrics.NewUniformSample(1000)),
}
lastBlockHeight := -1
durationTimer := time.After(time.Duration(duration) * time.Second)
ticker := time.NewTicker(1 * time.Second)
var blocks, txs int
for {
select {
case b := <-blockCh:
if lastBlockHeight < b.Height {
blocks++
txs += b.NumTxs
lastBlockHeight = b.Height
}
case l := <-blockLatencyCh:
stats.BlockLatency.Update(int64(l))
case <-ticker.C:
stats.BlockTimeSample.Update(int64(blocks))
stats.TxThroughputSample.Update(int64(txs))
blocks = 0
txs = 0
case <-durationTimer:
for _, t := range transacters {
t.Stop()
}
printStatistics(stats)
for _, n := range nodes {
n.Stop()
}
return
}
}
}
func startNodes(endpoints []string, blockCh chan<- tmtypes.Header, blockLatencyCh chan<- float64) []*monitor.Node {
nodes := make([]*monitor.Node, len(endpoints))
for i, e := range endpoints {
n := monitor.NewNode(e)
n.SendBlocksTo(blockCh)
n.SendBlockLatenciesTo(blockLatencyCh)
if err := n.Start(); err != nil {
panic(err)
}
nodes[i] = n
}
return nodes
}
func startTransacters(endpoints []string, connections int, txsRate int) []*transacter {
transacters := make([]*transacter, len(endpoints))
for i, e := range endpoints {
t := newTransacter(e, connections, txsRate)
if err := t.Start(); err != nil {
panic(err)
}
transacters[i] = t
}
return transacters
}
func printStatistics(stats *statistics) {
w := tabwriter.NewWriter(os.Stdout, 0, 0, 5, ' ', 0)
fmt.Fprintln(w, "Stats\tAvg\tStdev\tMax\t")
fmt.Fprintln(w, fmt.Sprintf("Block latency\t%.2fms\t%.2fms\t%dms\t",
stats.BlockLatency.Mean()/1000000.0,
stats.BlockLatency.StdDev()/1000000.0,
stats.BlockLatency.Max()/1000000))
fmt.Fprintln(w, fmt.Sprintf("Blocks/sec\t%.3f\t%.3f\t%d\t",
stats.BlockTimeSample.Mean(),
stats.BlockTimeSample.StdDev(),
stats.BlockTimeSample.Max()))
fmt.Fprintln(w, fmt.Sprintf("Txs/sec\t%.0f\t%.0f\t%d\t",
stats.TxThroughputSample.Mean(),
stats.TxThroughputSample.StdDev(),
stats.TxThroughputSample.Max()))
w.Flush()
}