diff --git a/cmd/pi/importfrags.go b/cmd/pi/importfrags.go
new file mode 100644
index 0000000..431081e
--- /dev/null
+++ b/cmd/pi/importfrags.go
@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/jaffee/commandeer/cobrafy"
+	"github.com/pilosa/tools/importfrags"
+	"github.com/spf13/cobra"
+)
+
+func NewImportFragsCommand() *cobra.Command {
+	com, err := cobrafy.Command(importfrags.NewMain())
+	if err != nil {
+		panic(fmt.Sprintf("Couldn't create cobra command: %v", err))
+	}
+	com.Use = "importfrags"
+	com.Short = "importfrags imports pilosa fragment files to shards."
+	com.Long = `importfrags imports pilosa fragment files to shards.
+
+TODO
+`
+
+	return com
+}
diff --git a/cmd/pi/main.go b/cmd/pi/main.go
index e238077..a3782e3 100644
--- a/cmd/pi/main.go
+++ b/cmd/pi/main.go
@@ -62,6 +62,7 @@ Build Time: ` + tools.BuildTime + "\n",
 
 	rc.AddCommand(NewBenchCommand())
 	rc.AddCommand(NewReplayCommand())
+	rc.AddCommand(NewImportFragsCommand())
 
 	rc.SetOutput(os.Stderr)
 	return rc
diff --git a/importfrags/cmd.go b/importfrags/cmd.go
new file mode 100644
index 0000000..9dc464e
--- /dev/null
+++ b/importfrags/cmd.go
@@ -0,0 +1,191 @@
+package importfrags
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"math/rand"
+	"os"
+	"path/filepath"
+	"strconv"
+	"sync/atomic"
+	"time"
+
+	"github.com/golang/protobuf/proto"
+	"golang.org/x/sync/errgroup"
+
+	"github.com/pilosa/go-pilosa"
+	pbuf "github.com/pilosa/go-pilosa/gopilosa_pbuf"
+	"github.com/pilosa/pilosa/roaring"
+	"github.com/pkg/errors"
+)
+
+type Main struct {
+	Dir      string `help:"Directory to walk looking for fragment data."`
+	Index    string
+	Field    string
+	Workers  int `help:"Number of worker goroutines to run."`
+	Pilosa   []string
+	Shards   uint64        `help:"Number of shards into which to ingest"`
+	Duration time.Duration `help:"How long to run the import"`
+
+	shardNodes    map[uint64][]pilosa.URI
+	bytesImported *uint64
+}
+
+func NewMain() *Main {
+	m := &Main{
+		Dir:     "frags",
+		Index:   "fragtest",
+		Field:   "field",
+		Workers: 8,
+		Pilosa:  []string{"localhost:10101"},
+		Shards:  10,
+	}
+	a := uint64(0)
+	m.bytesImported = &a
+	return m
+}
+
+func (m *Main) Run() error {
+	rand.Seed(time.Now().UnixNano())
+	fragments := make([]*roaring.Bitmap, 0)
+
+	// walk all files in directory structure and load the ones which are roaring bitmaps.
+	err := filepath.Walk(m.Dir,
+		func(path string, info os.FileInfo, err error) error {
+			if err != nil {
+				return errors.Wrap(err, "walk func")
+			}
+			if info.IsDir() {
+				return nil
+			}
+			f, err := os.Open(path)
+			defer f.Close()
+			if err != nil {
+				log.Printf("error opening '%s': %v", path, err)
+				return nil
+			}
+			data, err := ioutil.ReadAll(f)
+			if err != nil {
+				return errors.Wrap(err, "reading all")
+			}
+			bm := roaring.NewFileBitmap()
+			err = bm.UnmarshalBinary(data)
+			if err != nil {
+				log.Printf("%s was not a valid roaring bitmap: %v", path, err)
+			}
+			fragments = append(fragments, bm)
+			return nil
+		})
+	if err != nil {
+		return errors.Wrap(err, "walking file path")
+	}
+
+	if len(fragments) == 0 {
+		return errors.New("no valid bitmaps found.")
+	}
+	fmt.Printf("found %d bitmap files\n", len(fragments))
+
+	client, err := pilosa.NewClient(m.Pilosa)
+	if err != nil {
+		return errors.Wrapf(err, "getting client for %v", m.Pilosa)
+	}
+	sch, err := client.Schema()
+	if err != nil {
+		return errors.Wrap(err, "getting schema")
+	}
+	idx := sch.Index(m.Index)
+	idx.Field(m.Field)
+	err = client.SyncSchema(sch)
+	if err != nil {
+		return errors.Wrap(err, "syncing schema")
+	}
+
+	m.shardNodes, err = client.ExperimentalShardNodes(m.Index, m.Shards)
+	if err != nil {
+		return errors.Wrap(err, "getting shard nodes")
+	}
+
+	go m.reportProgress()
+
+	eg := errgroup.Group{}
+	done := make(chan struct{})
+	for i := 0; i < m.Workers; i++ {
+		i := i
+		eg.Go(func() error {
+			return m.importWorker(i, client, fragments, done)
+		})
+	}
+	if m.Duration > 0 {
+		fmt.Println("sleeping")
+		time.Sleep(m.Duration)
+		close(done)
+	}
+
+	return eg.Wait()
+}
+
+func (m *Main) reportProgress() {
+	start := time.Now()
+	last := time.Now()
+	lastb := uint64(0)
+	for tick := time.Tick(time.Second * 5); true; <-tick {
+		b := atomic.LoadUint64(m.bytesImported)
+		mbImported := float64(b) / 1024 / 1024
+		lmb := float64(b-lastb) / 1024 / 1024
+		fmt.Printf("imported %.2f MB. Overall %.2f MB/s, Last5: %.2f MB/s\n", mbImported, mbImported/time.Since(start).Seconds(), lmb/time.Since(last).Seconds())
+		last = time.Now()
+		lastb = b
+	}
+
+}
+
+func (m *Main) importWorker(num int, client *pilosa.Client, fragments []*roaring.Bitmap, done chan struct{}) error {
+	idx := num % len(fragments)
+	path := fmt.Sprintf("/index/%s/field/%s/import-roaring/", m.Index, m.Field)
+	headers := map[string]string{
+		"Content-Type": "application/x-protobuf",
+		"Accept":       "application/x-protobuf",
+		"PQL-Version":  pilosa.PQLVersion,
+	}
+	for {
+		shard := rand.Uint64() % m.Shards
+		hosts, ok := m.shardNodes[shard]
+		if !ok {
+			panic("tried to get unknown shard")
+		}
+
+		bitmap := fragments[idx]
+		data := &bytes.Buffer{}
+		//start := time.Now()
+		bitmap.WriteTo(data)
+		// writeDur := time.Since(start)
+		bytes := data.Bytes()
+		req := &pbuf.ImportRoaringRequest{
+			Views: []*pbuf.ImportRoaringRequestView{{Data: bytes}},
+		}
+		r, err := proto.Marshal(req)
+		if err != nil {
+			return errors.Wrap(err, "marshaling request to protobuf")
+		}
+		//start = time.Now()
+		resp, err := client.ExperimentalDoRequest(&hosts[0], "POST", path+strconv.Itoa(int(shard)), headers, r)
+		if err != nil {
+			return errors.Wrap(err, "error doing request")
+		}
+		if resp.StatusCode != 200 {
+			return errors.Errorf("bad resp from import: %v", resp)
+		}
+		// fmt.Printf("POST %d KB to %s shard: %d writeDur: %s postDur: %s\n", len(bytes)/1024, hosts[0].HostPort(), shard, writeDur, time.Since(start))
+		atomic.AddUint64(m.bytesImported, uint64(len(bytes)))
+
+		idx = (idx + 1) % len(fragments)
+		select {
+		case <-done:
+			return nil
+		default:
+		}
+	}
+}