func oid2filepath(cfg *Config, oID uint64) string {
return fmt.Sprintf("%s%c%x%c%016x", cfg.WorkDir, filepath.Seperator,
oid2vid(oID), filepath.Seperator, oID)
}
On Friday, 10 November 2017 09:58:03 UTC+13, Vasiliy Tolstov wrote:
>
> Hi. I have server that read/write data to many files (each is about
> 4-32Mb). To determine on which file i need to read/write i'm use this
> function to os.OpenFile
>
> func oid2filepath(cfg *Config, oID uint64) string {
> file_path := filepath.Join(cfg.WorkDir, fmt.Sprintf("%x",
> oid2vid(oID)), fmt.Sprintf("%016x", oID))
> return file_path
> }
>
> oid2vid function get uint32 and return uint32 with shift some bits
> path looks like (for one of 4Mb chunk) store/obj/7c2b25/007c2b2500000180
>
> When i'm write 4Gb data i need to call this function 1024 times for
> single big chunk of data.
> Does it possible to write function that does not have additional
> allocations?
> And does it possible to write it in portable way (i mean path separator).
>
>
> --
> Vasiliy Tolstov,
> e-mail: v.to...@selfip.ru <javascript:>
>
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