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always prefetch at least 5 blocks ahead

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This should reduce stuttering when streaming.

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>
This commit is contained in:
Steven Allen
2018-06-27 17:08:50 -07:00
parent 0344e3e602
commit ff3efb5646
1 changed files with 8 additions and 4 deletions
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12
unixfs/io/pbdagreader.go
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@ -68,8 +68,7 @@ func NewPBFileReader(ctx context.Context, n *mdag.ProtoNode, pb *ftpb.Data, serv
const preloadSize = 10
func (dr *PBDagReader) preloadNextNodes(ctx context.Context) {
beg := dr.linkPosition
func (dr *PBDagReader) preload(ctx context.Context, beg int) {
end := beg + preloadSize
if end >= len(dr.links) {
end = len(dr.links)
@ -90,8 +89,13 @@ func (dr *PBDagReader) precalcNextBuf(ctx context.Context) error {
return io.EOF
}
if dr.promises[dr.linkPosition] == nil {
dr.preloadNextNodes(ctx)
// If we drop to <= preloadSize/2 preloading nodes, preload the next 10.
for i := dr.linkPosition; i < dr.linkPosition+preloadSize/2 && i < len(dr.promises); i++ {
// TODO: check if canceled.
if dr.promises[i] == nil {
dr.preload(ctx, i)
break
}
}
nxt, err := dr.promises[dr.linkPosition].Get(ctx)