benchmarks: add comparisons to confluent-kafka-go & sarama

I was not expecting confluent-kafka-go to be so slow, but I guess the
cgo and then channel overhead quickly adds up.

For sarama, I was not expecting consuming to be so fast. But, franz-go
still beats it by 1.5x.

This also drops down the fetch max bytes in the franz-go benchmark,
because decompressing inflated responses a lot, which ate up a
significant amount of memory.

README.md

@@ -155,11 +155,20 @@ integrating with prometheus!
 ## Benchmarks
 
 This client is quite fast; it is the fastest and most cpu and memory efficient
-client in Go (and may even beat out librdkafka).
+client in Go.
+
+For 100 byte messages,
+
+- This client is 4x faster at producing than confluent-kafka-go, and up to
+  10x-20x faster (at the expense of more memory usage) at consuming.
+
+- This client is 2.5x faster at producing than sarama, and 1.5x faster at
+  consuming.
 
 To check benchmarks yourself, see the [bench](./examples/bench) example. This
 example lets you produce or consume to a cluster and see the byte / record
-rate.
+rate. The [compare](./examples/bench/compare) subdirectory shows comparison
+code.
 
 ## Supported KIPs
 

examples/bench/README.md

@@ -17,6 +17,16 @@ go run . -topic foo -no-compression
 go run . -tls -sasl-method scram-sha-256 -sasl-user user -sasl-pass pass -consume -group group -topic foo
 ```
 
+## Comparisons
+
+The [compare](./compare) directory has comparisons to other clients. For
+simplicity, not every aspect that is supported in this benchmark is ported to
+comparisons: tls support and sasl support may be missing, and for the
+confluent-kafka-go comparison, it does not seem possible to consume outside of
+a group.
+
+All flags that _can_ be easily supported in comparisons are the same.
+
 ## Flags
 
 `-brokers` can be specified to override the default localhost:9092 broker to

examples/bench/compare/confluent-kafka-go/go.mod

@@ -0,0 +1,5 @@
+module ckg
+
+go 1.16
+
+require github.com/confluentinc/confluent-kafka-go v1.7.0

examples/bench/compare/confluent-kafka-go/go.sum

@@ -0,0 +1,2 @@
+github.com/confluentinc/confluent-kafka-go v1.7.0 h1:tXh3LWb2Ne0WiU3ng4h5qiGA9XV61rz46w60O+cq8bM=
+github.com/confluentinc/confluent-kafka-go v1.7.0/go.mod h1:u2zNLny2xq+5rWeTQjFHbDzzNuba4P1vo31r9r4uAdg=

examples/bench/compare/confluent-kafka-go/main.go

@@ -0,0 +1,132 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"strconv"
+	"sync/atomic"
+	"time"
+
+	"github.com/confluentinc/confluent-kafka-go/kafka"
+)
+
+var (
+	seedBrokers = flag.String("brokers", "localhost:9092", "comma delimited list of seed brokers")
+	topic       = flag.String("topic", "", "topic to produce to or consume from")
+
+	recordBytes   = flag.Int("record-bytes", 100, "bytes per record (producing)")
+	noCompression = flag.Bool("no-compression", false, "set to disable snappy compression (producing)")
+
+	consume = flag.Bool("consume", false, "if true, consume rather than produce")
+	group   = flag.String("group", "", "if non-empty, group to use for consuming rather than direct partition consuming (consuming)")
+
+	rateRecs  int64
+	rateBytes int64
+)
+
+func printRate() {
+	go func() {
+		for range time.Tick(time.Second) {
+			recs := atomic.SwapInt64(&rateRecs, 0)
+			bytes := atomic.SwapInt64(&rateBytes, 0)
+			fmt.Printf("%0.2f MiB/s; %0.2fk records/s\n", float64(bytes)/(1024*1024), float64(recs)/1000)
+		}
+	}()
+}
+
+func die(msg string, args ...interface{}) {
+	fmt.Fprintf(os.Stderr, msg+"\n", args...)
+	os.Exit(1)
+}
+
+func chk(err error, msg string, args ...interface{}) {
+	if err != nil {
+		die(msg, args...)
+	}
+}
+
+func main() {
+	flag.Parse()
+
+	go printRate()
+
+	switch *consume {
+	case false:
+		cfg := &kafka.ConfigMap{
+			"bootstrap.servers":  *seedBrokers,
+			"enable.idempotence": true,
+		}
+		if !*noCompression {
+			(*cfg)["compression.codec"] = "snappy"
+		}
+		p, err := kafka.NewProducer(cfg)
+		chk(err, "unable to create producer: %v", err)
+
+		go func() {
+			for {
+				switch ev := (<-p.Events()).(type) {
+				case *kafka.Message:
+					err := ev.TopicPartition.Error
+					chk(err, "produce error: %v", err)
+					atomic.AddInt64(&rateRecs, 1)
+					atomic.AddInt64(&rateBytes, int64(*recordBytes))
+				case kafka.Error:
+					if ev.IsFatal() {
+						die("fatal err: %v", err)
+					}
+				}
+			}
+		}()
+		var num int64
+		for {
+			err = p.Produce(&kafka.Message{
+				TopicPartition: kafka.TopicPartition{Topic: topic, Partition: kafka.PartitionAny},
+				Value:          newValue(num),
+			}, nil)
+			num++
+			chk(err, "unable to produce: %v", err)
+		}
+
+	case true:
+		cfg := &kafka.ConfigMap{
+			"bootstrap.servers": *seedBrokers,
+			"auto.offset.reset": "earliest",
+			"group.id":          *group,
+		}
+		c, err := kafka.NewConsumer(cfg)
+		chk(err, "unable to create consumer: %v", err)
+
+		if err := c.Subscribe(*topic, nil); err != nil {
+			die("unable to subscribe to topic: %v", err)
+
+		}
+		for {
+			ev := c.Poll(100)
+			if ev == nil {
+				continue
+			}
+			switch e := ev.(type) {
+			case *kafka.Message:
+				atomic.AddInt64(&rateRecs, 1)
+				atomic.AddInt64(&rateBytes, int64(len(e.Value)))
+			case kafka.Error:
+				die("consume error: %v", err)
+			}
+		}
+	}
+}
+
+func newValue(num int64) []byte {
+	var buf [20]byte // max int64 takes 19 bytes, then we add a space
+	b := strconv.AppendInt(buf[:0], num, 10)
+	b = append(b, ' ')
+
+	s := make([]byte, *recordBytes)
+
+	var n int
+	for n != len(s) {
+		n += copy(s[n:], b)
+	}
+	return s
+}

examples/bench/compare/sarama/go.mod

@@ -0,0 +1,10 @@
+module saram
+
+go 1.16
+
+require (
+	github.com/Shopify/sarama v1.29.0
+	github.com/klauspost/compress v1.12.3 // indirect
+	golang.org/x/crypto v0.0.0-20210513164829-c07d793c2f9a // indirect
+	golang.org/x/net v0.0.0-20210525063256-abc453219eb5 // indirect
+)

examples/bench/compare/sarama/go.sum

@@ -0,0 +1,89 @@
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+github.com/Shopify/toxiproxy v2.1.4+incompatible h1:TKdv8HiTLgE5wdJuEML90aBgNWsokNbMijUGhmcoBJc=
+github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
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+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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