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Reduce WriteAll allocs (#10810)

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WriteAll saw 127GB allocs in a 5 minute timeframe for 4MiB buffers 
used by `io.CopyBuffer` even if they are pooled.

Since all writers appear to write byte buffers, just send those 
instead and write directly. The files are opened through the `os` 
package so they have no special properties anyway.

This removes the alloc and copy for each operation.

REST sends content length so a precise alloc can be made.
This commit is contained in:
Klaus Post
2020-11-02 16:14:31 -08:00
committed by GitHub
parent 8527f22df1
commit 86e0d272f3
9 changed files with 33 additions and 26 deletions
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4
cmd/xl-storage_test.go
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@@ -133,7 +133,7 @@ func newXLStorageTestSetup() (*xlStorageDiskIDCheck, string, error) {
return nil, "", err
}
// Create a sample format.json file
err = storage.WriteAll(context.Background(), minioMetaBucket, formatConfigFile, bytes.NewBufferString(`{"version":"1","format":"xl","id":"592a41c2-b7cc-4130-b883-c4b5cb15965b","xl":{"version":"3","this":"da017d62-70e3-45f1-8a1a-587707e69ad1","sets":[["e07285a6-8c73-4962-89c6-047fb939f803","33b8d431-482d-4376-b63c-626d229f0a29","cff6513a-4439-4dc1-bcaa-56c9e880c352","da017d62-70e3-45f1-8a1a-587707e69ad1","9c9f21d5-1f15-4737-bce6-835faa0d9626","0a59b346-1424-4fc2-9fa2-a2e80541d0c1","7924a3dc-b69a-4971-9a2e-014966d6aebb","4d2b8dd9-4e48-444b-bdca-c89194b26042"]],"distributionAlgo":"CRCMOD"}}`))
err = storage.WriteAll(context.Background(), minioMetaBucket, formatConfigFile, []byte(`{"version":"1","format":"xl","id":"592a41c2-b7cc-4130-b883-c4b5cb15965b","xl":{"version":"3","this":"da017d62-70e3-45f1-8a1a-587707e69ad1","sets":[["e07285a6-8c73-4962-89c6-047fb939f803","33b8d431-482d-4376-b63c-626d229f0a29","cff6513a-4439-4dc1-bcaa-56c9e880c352","da017d62-70e3-45f1-8a1a-587707e69ad1","9c9f21d5-1f15-4737-bce6-835faa0d9626","0a59b346-1424-4fc2-9fa2-a2e80541d0c1","7924a3dc-b69a-4971-9a2e-014966d6aebb","4d2b8dd9-4e48-444b-bdca-c89194b26042"]],"distributionAlgo":"CRCMOD"}}`))
if err != nil {
return nil, "", err
}
@@ -1659,7 +1659,7 @@ func TestXLStorageVerifyFile(t *testing.T) {
h := algo.New()
h.Write(data)
hashBytes := h.Sum(nil)
if err := xlStorage.WriteAll(context.Background(), volName, fileName, bytes.NewBuffer(data)); err != nil {
if err := xlStorage.WriteAll(context.Background(), volName, fileName, data); err != nil {
t.Fatal(err)
}
if err := xlStorage.storage.bitrotVerify(pathJoin(path, volName, fileName), size, algo, hashBytes, 0); err != nil {