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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/naughty-disk_test.go
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@@ -273,11 +273,11 @@ func (d *naughtyDisk) ReadVersion(ctx context.Context, volume, path, versionID s
return d.disk.ReadVersion(ctx, volume, path, versionID, checkDataDir)
}
func (d *naughtyDisk) WriteAll(ctx context.Context, volume string, path string, reader io.Reader) (err error) {
func (d *naughtyDisk) WriteAll(ctx context.Context, volume string, path string, b []byte) (err error) {
if err := d.calcError(); err != nil {
return err
}
return d.disk.WriteAll(ctx, volume, path, reader)
return d.disk.WriteAll(ctx, volume, path, b)
}
func (d *naughtyDisk) ReadAll(ctx context.Context, volume string, path string) (buf []byte, err error) {