move bench package to bench/cmd/bolt/bench

1 files changed, 126 insertions, 0 deletions

diff --git a/cmd/bolt/bench/bench.go b/cmd/bolt/bench/bench.go
new file mode 100644
index 0000000..df584f2
--- /dev/null
+++ b/cmd/bolt/bench/bench.go
@@ -0,0 +1,126 @@
+package bench
+
+import (
+	"errors"
+	"fmt"
+	"sync"
+	"testing"
+
+	"github.com/boltdb/bolt"
+)
+
+const (
+	BenchReadMode            = "read"
+	BenchWriteMode           = "write"
+	BenchSequentialTraversal = "sequential"
+	BenchRandomTraversal     = "random"
+)
+
+type Benchmark struct {
+	db     *bolt.DB
+	config *Config
+}
+
+func New(db *bolt.DB, config *Config) *Benchmark {
+	b := new(Benchmark)
+	b.db = db
+	b.config = config
+	return b
+}
+
+func (bm *Benchmark) Run(b *testing.B) {
+
+	// Read buckets and keys before benchmark begins so we don't knew the
+	// results.
+	buckets, err := buckets(bm.db)
+	if err != nil {
+		b.Fatalf("error: %+v", err)
+	}
+	bucketsWithKeys := make(map[string][]string)
+	for _, bucket := range buckets {
+		keys, err := keys(bm.db, bucket)
+		if err != nil {
+			b.Fatalf("error: %+v", err)
+		}
+		bucketsWithKeys[bucket] = keys
+	}
+
+	b.ResetTimer()
+
+	// Keep running a fixed number of parallel reads until we run out of time.
+	for i := 0; i < b.N; i++ {
+		var wg sync.WaitGroup
+		for j := 0; j < bm.config.Parallelism; j++ {
+			wg.Add(1)
+			go func() {
+				defer wg.Done()
+				if err := bm.readBuckets(b, bm.db, bucketsWithKeys); err != nil {
+					b.Fatalf("error: %+v", err)
+				}
+			}()
+		}
+		wg.Wait()
+	}
+}
+
+// Run benchmark(s) for each of the given buckets.
+func (bm *Benchmark) readBuckets(b *testing.B, db *bolt.DB, bucketsWithKeys map[string][]string) error {
+	return db.View(func(tx *bolt.Tx) error {
+		bucketsCount := len(bucketsWithKeys)
+		count := 0
+		for bucket, keys := range bucketsWithKeys {
+			bucket := tx.Bucket([]byte(bucket))
+			if err := bm.readKeys(b, bucket, keys); err != nil {
+				return err
+			}
+			count++
+		}
+		if count != bucketsCount {
+			return errors.New(fmt.Sprintf("wrong count: %d; expected: %d", count, bucketsCount))
+		}
+		return nil
+	})
+}
+
+func (bm *Benchmark) readKeys(b *testing.B, bucket *bolt.Bucket, keys []string) error {
+	c := bucket.Cursor()
+	keysCount := len(keys)
+	count := 0
+	for k, _ := c.First(); k != nil; k, _ = c.Next() {
+		count++
+	}
+	if count != keysCount {
+		return errors.New(fmt.Sprintf("wrong count: %d; expected: %d", count, keysCount))
+	}
+	return nil
+}
+
+func buckets(db *bolt.DB) ([]string, error) {
+	buckets := []string{}
+	err := db.View(func(tx *bolt.Tx) error {
+		// Iterate over each bucket.
+		return tx.ForEach(func(name []byte, _ *bolt.Bucket) error {
+			buckets = append(buckets, string(name))
+			return nil
+		})
+	})
+	return buckets, err
+}
+
+func keys(db *bolt.DB, bucket string) ([]string, error) {
+	keys := []string{}
+	err := db.View(func(tx *bolt.Tx) error {
+		// Find bucket.
+		b := tx.Bucket([]byte(bucket))
+		if b == nil {
+			return errors.New(fmt.Sprintf("bucket %+v not found", b))
+		}
+
+		// Iterate over each key.
+		return b.ForEach(func(key, _ []byte) error {
+			keys = append(keys, string(key))
+			return nil
+		})
+	})
+	return keys, err
+}