2011/11/17 Jean-Armel Luce <jaluce06@xxxxxxxxx>: > > 2011/11/16 Scott Ribe <scott_ribe@xxxxxxxxxxxxxxxx>: >> >> > Does the network connection have high latency? > > When I ping the server,time=15ms. > >> > Also, I believe you said -z seemed to slow it down? > > I confirm > >> > >> > I'm certainly glad that you've got a 3x speed increase-- > > Me too :-) . Thanks for your advices. Thanks to Cédric too you're welcome. > ; >> >> But still, something seems odd about the performance you've reported, so >> I'm left wondering about what could cause that. Disk performance glitch at >> one end or the other, network performance, CPU load??? > > CPU usage is very low strange (added to the -z making things worse). there should be something behind as supposed Scott. Virtual host ? Firewall ? something not common ? > > Today, I tried with command : rsync -rc --block-size=8192 > Rsync duration with blksize=8192 was 31 minutes (yesterday without > blocksize, duration was 32 minutes exactly) idea behind the blocksize changes was also to reduce the number of checksum comparaison and alignement (by 8) and compare with the rsync with --ignore-time instead of --checksum That should give a good idea on the extra cost of the block checksum for files without changes (which are matched by --checksum). -- Cédric Villemain +33 (0)6 20 30 22 52 http://2ndQuadrant.fr/ PostgreSQL: Support 24x7 - Développement, Expertise et Formation -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin
