why? my decompress is long time

[jiangjiangjiangjiangjiangjiangjiang]

zstd file size: 222M
take time of zstd decompress: 4s

my code:

func ZstdDecompressFile(src, dst string) error {
    in_file, err := os.Open(src)
    if err != nil {
        return err
    }
    defer in_file.Close()
    out_file, err := os.Create(dst)
    if err != nil {
        return err
    }
    defer out_file.Close()

    zst_reader, err := zstd.NewReader(in_file)
    if err != nil {
        return err
    }

    _, err = io.Copy(out_file, zst_reader)
    if err != nil {
        zst_reader.Close()
        return err
    }

    return nil
}

[klauspost]

Slow disk?

How long does it take to copy ioutil.Discard?

I am really just guessing. It could also be that your output file is huge. No idea really.

Provide more info.

[jiangjiangjiangjiangjiangjiangjiang]

the decompressed file(tar file) size is 1G
ioutil.Discard's time about 2s
so, the decompress speed is 1G/2s = 500M/s now.

[klauspost]

That is the expected speed.

Assembly is currently being finalized so the next release will likely be faster.

[jiangjiangjiangjiangjiangjiangjiang]

wow, it is magic...