samba-bugs at samba.org
2010-Dec-08 03:09 UTC
DO NOT REPLY [Bug 7854] New: Abysmal sparse file performance
https://bugzilla.samba.org/show_bug.cgi?id=7854
Summary: Abysmal sparse file performance
Product: rsync
Version: 3.0.7
Platform: x86
OS/Version: FreeBSD
Status: NEW
Severity: major
Priority: P3
Component: core
AssignedTo: wayned at samba.org
ReportedBy: grarpamp at gmail.com
QAContact: rsync-qa at samba.org
I have a 5.5GB file, mostly sparse. Tar performs far[!] better than rsync.
I have no ideas yet, so just an FYI as to current state.
FreeBSD 8.1 i386 zfs
Yes, I know the blocks used differs but don't know why yet, could
be just how zfs does things or related to the large amount of sparseness.
There are no media errors, CPU/IO load or anything like that and the source
and dest paths are on the same filesystem.
I've not tested times for files that are, say, 90% full instead of 90%
sparse
Though a 50% 35MB file was 8.5x slower than tar and had identical
block counts and sha256 with both.
/usr/bin/time rsync -HaxiS ./a ../>f+++++++++ a
271.13 real 101.44 user 95.62 sys
ls -sl ./a ../a ; rm -f ../a
blocks bytes
3625 5535932416 ./a
3769 5535932416 ../a
/usr/bin/time tar -cf - ./a | /usr/bin/time tar -C .. -Sxf -
57.67 real 1.10 user 27.77 sys
57.67 real 10.68 user 5.87 sys
ls -sl ./a ../a ; rm -f ../a
blocks bytes
3625 5535932416 ./a
2977 5535932416 ../a
--
Configure bugmail: https://bugzilla.samba.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the QA contact for the bug, or are watching the QA contact.
https://bugzilla.samba.org/show_bug.cgi?id=7854 --- Comment #1 from grarpamp at gmail.com 2012-02-29 07:08:41 UTC --- Bump and request for 1.25 year review. Sparse files can be created with dd. Sparseness in reasonably random locations and densities can be created with partial bittorrent downloads. -- Configure bugmail: https://bugzilla.samba.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the QA contact for the bug.
https://bugzilla.samba.org/show_bug.cgi?id=7854 --- Comment #2 from grarpamp at gmail.com 2012-03-10 22:52:51 UTC --- Maybe related: https://bugzilla.samba.org/show_bug.cgi?id=5801 -- Configure bugmail: https://bugzilla.samba.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the QA contact for the bug.
https://bugzilla.samba.org/show_bug.cgi?id=7854
Björn Jacke <bj at sernet.de> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #3 from Björn Jacke <bj at sernet.de> ---
yes the speed penalty is there because the data needs to be analyzed on the
receiver site. Only a protocol extension for unallocated sparse regions can
solve this.
*** This bug has been marked as a duplicate of bug 5801 ***
--
You are receiving this mail because:
You are the QA Contact for the bug.