reducing I/O and system load
Matt McCutchen
hashproduct at verizon.net
Fri Feb 17 01:42:25 GMT 2006
On Thu, 2006-02-16 at 15:58 -0800, Philip Lowman wrote:
> On Thu, Feb 16, 2006 at 07:49:03PM +0800, Denis Solovyov wrote:
> > I'm using rsync for simple daily back up data from one HD to another. It
> > takes about 10 minutes daily under "nice -n 19". The problem is
> > well-known as I see - several other services such as httpd or mysql
> > begin responding slowly (up to 10 sec for mysql queries which usually
> > processed in a small fraction of a second).
> --bwlimit=KBPS limit I/O bandwidth; KBytes per second
--bwlimit only limits the rate of transfer over the network. Vilius
Puidokas encountered the same problem and traced it to the scanning as
rsync generates the file list. He wrote a patch that adds a --slow-down
option that makes rsync wait a few microseconds in between scanning each
file. Find it here:
http://vilius.multiply.com/video/item/10
--
Matt McCutchen
hashproduct at verizon.net
http://hashproduct.metaesthetics.net/
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