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dynamically size download parts based on file size

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This commit is contained in:
Michael Yang 2023-10-10 17:22:44 -07:00
parent a2055a1e93
commit 630bb75d2a
1 changed files with 17 additions and 5 deletions
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22
server/download.go
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@ -20,6 +20,7 @@ import (
"golang.org/x/sync/errgroup"
"github.com/jmorganca/ollama/api"
"github.com/jmorganca/ollama/format"
)
var blobDownloadManager sync.Map
@ -47,6 +48,12 @@ type blobDownloadPart struct {
*blobDownload `json:"-"`
}
const (
numDownloadParts = 64
minDownloadPartSize int64 = 32 * 1000 * 1000
maxDownloadPartSize int64 = 256 * 1000 * 1000
)
func (p *blobDownloadPart) Name() string {
return strings.Join([]string{
p.blobDownload.Name, "partial", strconv.Itoa(p.N),
@ -92,9 +99,15 @@ func (b *blobDownload) Prepare(ctx context.Context, requestURL *url.URL, opts *R
b.Total, _ = strconv.ParseInt(resp.Header.Get("Content-Length"), 10, 64)
var offset int64
var size int64 = 64 * 1024 * 1024
var size = b.Total / numDownloadParts
switch {
case size < minDownloadPartSize:
size = minDownloadPartSize
case size > maxDownloadPartSize:
size = maxDownloadPartSize
}
var offset int64
for offset < b.Total {
if offset+size > b.Total {
size = b.Total - offset
@ -108,7 +121,7 @@ func (b *blobDownload) Prepare(ctx context.Context, requestURL *url.URL, opts *R
}
}
log.Printf("downloading %s in %d part(s)", b.Digest[7:19], len(b.Parts))
log.Printf("downloading %s in %d %s part(s)", b.Digest[7:19], len(b.Parts), format.HumanBytes(b.Parts[0].Size))
return nil
}
@ -126,8 +139,7 @@ func (b *blobDownload) Run(ctx context.Context, requestURL *url.URL, opts *Regis
file.Truncate(b.Total)
g, _ := errgroup.WithContext(ctx)
// TODO(mxyng): download concurrency should be configurable
g.SetLimit(64)
g.SetLimit(numDownloadParts)
for i := range b.Parts {
part := b.Parts[i]
if part.Completed == part.Size {