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
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