On Samstag 15 August 2009, Dirk Heinrichs wrote: > Am Freitag 14 August 2009 22:47:46 schrieb Joerg Schilling: > > Dirk Heinrichs <dirk.heinri...@online.de> wrote: > > > Am Freitag 14 August 2009 10:50:45 schrieb Joerg Schilling: > > > > Note that on Linux you may need to add "-no-fsync" because file I/O > > > > is slow on Linux. On Solaris, not using -no-fsync slows things down > > > > by aprox. 10% but allows star to grant that everything was really > > > > copied to stable storage. On Linux, ot using -no-fsync slows things > > > > down by aprox. 400%, this is why I recommend to add "-no-fsync". > > > > > > This is also quite interesting. Do you have some (links to) recent > > > benchmarks which would second that? Could this even be depending on the > > > filesystem used on Linux? > > > > I did this test aprox. 3-4 years ago. You may try to do an own test and > > report. > > > > I did just rerun a test on a recent ubuntu in a VirtualBox environment > > and the speedup factor with -no-fsync was 8x. > > OK, here's mine, then. Please note that the test happened on an encrypted > logical volume containing an XFS filesystem. Source and destination > directory are on the same LV. > > # time star -copy -p -xdot -acl -sparse -C /gentoo/overlays/portage . > /gentoo/build/portage > star: 0 blocks + 447532544 bytes (total of 447532544 bytes = 437043.50k). > star -copy -p -xdot -acl -sparse -C /gentoo/overlays/portage . 16,57s > user 60,22s system 11% cpu 11:23,63 total > > # time star -copy -p -xdot -acl -sparse -no-fsync -C > /gentoo/overlays/portage . /gentoo/build/portage > star: 0 blocks + 447532544 bytes (total of 447532544 bytes = 437043.50k). > star -copy -p -xdot -acl -sparse -no-fsync -C /gentoo/overlays/portage . > 12,33s user 35,39s system 10% cpu 7:44,13 total > > Unfortunately, I can't compare with OSol :( > > Bye... > > Dirk
and you dropped caches in between?
