About a month ago there was some discussion on Java slowness on this list (the thread title was "Java GUI broken on LTSP 5").
In Ubuntu Hardy, with LTSP5, some Java applications are simply unusable slow. The issues appear to have something to do with how Java uses X-client libraries to send data to an X server. In Ubuntu Feisty the problem does not exist, and it most probably does not exist in Gutsy either. Between Gutsy and Hardy, there has been a significant change in the X11-client library, that has started using XCB (X protocol C-language Binding, see http://xcb.freedesktop.org/) as an underlying X protocol library. The sluggishness of some Java applications can be solved in Ubuntu Hardy by replacing the /usr/lib32/libX11.so.6.2.0 file in Hardy with the version in Gutsy (presuming Firefox and Java are 32-bit versions, so they use 32-bit libraries). The main difference between these versions appears to be that the Hardy version links to /usr/lib/libxcb-xlib.so.0 and /usr/lib/libxcb.so.1, and the older version does not. Similar change may work as well with other LTSP distributions that are affected by this. I do not know what it is in the actual X11-client implementation that makes this difference, but it appears to make a dramatic difference with many Java applications, for example the web-usable version in http://www.typingmaster.com/. Juha ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _____________________________________________________________________ Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: https://lists.sourceforge.net/lists/listinfo/ltsp-discuss For additional LTSP help, try #ltsp channel on irc.freenode.net
