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Centralize buffer allocation and size checking in Repository.LoadBlob

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Benchmark results for internal/repository:

name              old time/op    new time/op    delta
LoadTree-8           479µs ± 2%     478µs ± 1%   ~     (p=0.780 n=10+9)
LoadBlob-8          11.6ms ± 2%    11.6ms ± 1%   ~     (p=0.631 n=10+10)
LoadAndDecrypt-8    13.2ms ± 2%    13.3ms ± 3%   ~     (p=0.631 n=10+10)

name              old alloc/op   new alloc/op   delta
LoadTree-8          41.2kB ± 0%    41.2kB ± 0%   ~     (all equal)
LoadBlob-8          2.28kB ± 0%    2.28kB ± 0%   ~     (all equal)
LoadAndDecrypt-8    2.10MB ± 0%    2.10MB ± 0%   ~     (all equal)

name              old allocs/op  new allocs/op  delta
LoadTree-8             652 ± 0%       652 ± 0%   ~     (all equal)
LoadBlob-8            24.0 ± 0%      24.0 ± 0%   ~     (all equal)
LoadAndDecrypt-8      30.0 ± 0%      30.0 ± 0%   ~     (all equal)

name              old speed      new speed      delta
LoadBlob-8        86.2MB/s ± 2%  86.4MB/s ± 1%   ~     (p=0.594 n=10+10)
LoadAndDecrypt-8  75.7MB/s ± 2%  75.4MB/s ± 3%   ~     (p=0.617 n=10+10)
This commit is contained in:
greatroar
2020-03-10 16:41:22 +01:00
parent 956a1b0f96
commit be5a0ff59f
9 changed files with 37 additions and 80 deletions
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7
cmd/restic/cmd_cat.go
View File

@@ -170,18 +170,15 @@ func runCat(gopts GlobalOptions, args []string) error {
case "blob":
for _, t := range []restic.BlobType{restic.DataBlob, restic.TreeBlob} {
list, found := repo.Index().Lookup(id, t)
_, found := repo.Index().Lookup(id, t)
if !found {
continue
}
blob := list[0]
buf := make([]byte, blob.Length)
n, err := repo.LoadBlob(gopts.ctx, t, id, buf)
buf, err := repo.LoadBlob(gopts.ctx, t, id, nil)
if err != nil {
return err
}
buf = buf[:n]
_, err = os.Stdout.Write(buf)
return err

19
cmd/restic/cmd_dump.go
View File

@@ -171,24 +171,15 @@ func runDump(opts DumpOptions, gopts GlobalOptions, args []string) error {
}
func getNodeData(ctx context.Context, output io.Writer, repo restic.Repository, node *restic.Node) error {
var buf []byte
var (
buf []byte
err error
)
for _, id := range node.Content {
size, found := repo.LookupBlobSize(id, restic.DataBlob)
if !found {
return errors.Errorf("id %v not found in repository", id)
}
buf = buf[:cap(buf)]
if len(buf) < restic.CiphertextLength(int(size)) {
buf = restic.NewBlobBuffer(int(size))
}
n, err := repo.LoadBlob(ctx, restic.DataBlob, id, buf)
buf, err = repo.LoadBlob(ctx, restic.DataBlob, id, buf)
if err != nil {
return err
}
buf = buf[:n]
_, err = output.Write(buf)
if err != nil {