bwlimit on rsync locally

[Reeve Yang]

Is there anyway to make rsync use direct I/O bypassing FS buffer?

On Thu, Mar 27, 2008 at 10:57 PM, John Van Essen <vanes002 at umn.edu> wrote:
> On Thu, 27 Mar 2008, Reeve Yang <reeve.yang at gmail.com> wrote:
>  > Does "bwlimit" option really work on rsync locally?
>
>  Yes, it does.
>
>
>  > rsync without --bwlimit:
>  >> iostat; rsync -a -r --stats swapfile swapfile.rsync; iostat
>  ....
>
> > sent 2147745923 bytes  received 42 bytes  23472633.50 bytes/sec
>  ....
>
> > rysnc with --bwlimit:
>  >> iostat && rsync -a -r --stats --bwlimit=2500 swapfile swapfile.rsync && iostat
>  ....
>
> > sent 2147745923 bytes  received 42 bytes  2543216.06 bytes/sec
>
>  Notice that the second rsync "bytes/sec" was a factor of 10 smaller
>  than the first one and was, indeed, approximately 2500 kBps.
>
>  If it isn't having the effect you want, keep lowering the bwlimit
>  value until you get the desired results.
>
>     John
>
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