Stefan Fuhrmann wrote on Tue, Dec 27, 2011 at 01:30:38 +0100: > As of r1224839, FSFS now supports directory deltification.
If you haven't seen it already, I opened an issue around this just recently: http://subversion.tigris.org/issues/show_bug.cgi?id=4084 > Please review the changes and run tests against different > repositories so that we get a better idea of what the costs > and benefits are. As soon as I'm back home, I will run tests > against the Apache and KDE repositories. > > So far, I ran tests against the rather small TSVN repository. > It seems that we get 50% more capacity / 33% size savings > for 0 .. 20% CPU overhead. The savings should be more > significant on larger repositories and some of the extra > overhead should be removed by the file handle caching > code - once merged into /trunk. > > In any case, we are still much faster than 1.6. > Detailed results can be found in the attached document. > "/trunk" is at r1224828 (i.e. without deltification tuning. > > -- Stefan^2. > Ubuntu 11.10, 64 bit (ssd), packed repository > > repository size > > 1.6.12 414.9MB (100%) > trunk 414.9MB (100%) > trunk+diff 275.9MB ( 66%) > > svnadmin load -q (4.3GB non-deltified dump file) > > 1.6.12 5m25.625s (156%) > trunk 3m29.225s (100%) > trunk -M1000 3m 1.455s ( 87%) > trunk+diff 4m 1.313s (115%) > trunk+diff -M1000 3m23.496s ( 97%) > > svnadmin verify -q > > 1.6.12 68m21.244s (3877%) > trunk 1m45.786s (100%) > trunk -M1000 1m18.207s ( 74%) > trunk+diff 2m10.199s (123%) > trunk+diff -M1000 1m36.188s ( 91%) > > svnserve -dT (addtional flags for trunk: -c0) > svn export svn://localhost/repo/trunk -q --ignore-externals (cold) > (85MB, 3840 items) > > 1.6.12 18.223s (883%) > trunk 2.063s (100%) > trunk -M1000 2.888s (140%) > trunk+diff 2.607s (126%) > trunk+diff -M1000 2.691s (130%) > > svn export svn://localhost/repo/trunk -q --ignore-externals (hot) > > 1.6.12 17.743s (841%) > trunk 2.111s (100%) > trunk -M1000 0.901s ( 43%) > trunk+diff 2.412s (114%) > trunk+diff -M1000 0.994s ( 47%) > > svn ls svn://localhost/repo/tags (cold) > (accuracy +/- 2ms) > > 1.6.12 66ms (125%) > trunk 53ms (100%) > trunk -M1000 128ms (242%) > trunk+diff 52ms ( 98%) > trunk+diff -M1000 123ms (232%) > > svn ls svn://localhost/repo/tags (hot) > (accuracy +/- 2ms) > > 1.6.12 66ms (140%) > trunk 47ms (100%) > trunk -M1000 49ms (104%) > trunk+diff 45ms ( 96%) > trunk+diff -M1000 47ms (100%) > >
