Add vectored read to readbenchfs
You can now run `./readbenchfs --mount_point dir --vectored` and then `dd if=dir/test of=/dev/null iflag=direct bs=1M status=progress` to test vectored read speed. Results from my laptop (Linux 5.10): 1 core (GOMAXPROCS=1): - Before vectored read patch: 2.1 GB/s - Non-vectored read after vectored read patch: 2.1 GB/s - Vectored read: 2.8 GB/s All cores: - Before vectored read patch: 3.0 GB/s - Non-vectored read after vectored read patch: 3.3 GB/s - Vectored read: 5.9 GB/sgeesefs-0-31-3
parent
c818f6216b
commit
84920d11dd
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@ -14,6 +14,7 @@ import (
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var fMountPoint = flag.String("mount_point", "", "Path to mount point.")
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var fReadOnly = flag.Bool("read_only", false, "Mount in read-only mode.")
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var fVectored = flag.Bool("vectored", false, "Use vectored read.")
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var fDebug = flag.Bool("debug", false, "Enable debug logging.")
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var fPprof = flag.Int("pprof", 0, "Enable pprof profiling on the specified port.")
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@ -26,7 +27,7 @@ func main() {
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}()
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}
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server, err := readbenchfs.NewReadBenchServer()
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server, err := readbenchfs.NewReadBenchServer(*fVectored)
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if err != nil {
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log.Fatalf("makeFS: %v", err)
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}
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@ -38,6 +39,7 @@ func main() {
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cfg := &fuse.MountConfig{
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ReadOnly: *fReadOnly,
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UseVectoredRead: *fVectored,
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}
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if *fDebug {
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@ -28,6 +28,7 @@ import (
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type readBenchFS struct {
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fuseutil.NotImplementedFileSystem
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buf []byte
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useVectoredRead bool
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}
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// 1 TB
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@ -35,14 +36,13 @@ const fileSize = 1024 * 1024 * 1024 * 1024
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var _ fuseutil.FileSystem = &readBenchFS{}
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// Create a file system that mirrors an existing physical path, in a readonly mode
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func NewReadBenchServer() (server fuse.Server, err error) {
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func NewReadBenchServer(useVectoredRead bool) (server fuse.Server, err error) {
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// 1 GB of random data to exceed CPU cache
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buf := make([]byte, 1024*1024*1024)
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rand.Read(buf)
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server = fuseutil.NewFileSystemServer(&readBenchFS{
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buf: buf,
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useVectoredRead: useVectoredRead,
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})
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return
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}
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@ -123,7 +123,7 @@ func (fs *readBenchFS) ReadFile(ctx context.Context, op *fuseops.ReadFileOp) err
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if op.Offset > fileSize {
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return io.EOF
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}
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end := op.Offset + int64(len(op.Dst))
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end := op.Offset + op.Size
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if end > fileSize {
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end = fileSize
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}
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@ -134,10 +134,13 @@ func (fs *readBenchFS) ReadFile(ctx context.Context, op *fuseops.ReadFileOp) err
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if e-s > end-pos {
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e = s + end - pos
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}
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if fs.useVectoredRead {
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op.Data = append(op.Data, fs.buf[s:e])
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} else {
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copy(op.Dst[pos-op.Offset:], fs.buf[s:])
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}
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pos = op.Offset + e
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}
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//op.Data = [][]byte{ contents[op.Offset : end] }
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op.BytesRead = int(end - op.Offset)
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return nil
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}
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