On 2015-04-10 21:54+0100 Andrew Ross wrote: > > Hazen, > > That's interesting, and at odds with my tests a week or so back on Kubuntu > 14.10. Can you confirm which flavour and version of Ubuntu you are using? > Also, I assume this is with Qt4 and not Qt5?
Hi Andrew: The answers to your questions have been scattered a bit in different threads so to collect them together for you here, Hazen used Qt4.8.6, and Lubuntu, and today he said he was pretty sure the version was 14.04.2 LTS. And he recently attached a detailed valgrind report that showed all sorts of invalid reads for one of the qt devices on his Lubuntu platform. (Interestingly, the invalid reads occurred during initialization rather than the cases we have looked at in the past where invalid reads occurred at plend.) So if you run that specific valgrind test on your own kubuntu version and do not confirm the severe memory management errors, then that is a pretty clear demonstration of a Lubuntu Qt bug, and if the Qt packaging for Lubuntu is identical to that used for every other variant besides Kubuntu, then it is likely a non-Kubuntu Ubuntu bug. Since there is only a 6-month difference between 14.04.2 LTS and 14.10 and we never appear to get such severe memory management issues for at least two variants of Debian (which sticks pretty close to the upstream version of Qt) there is a decent chance this bug has nothing to do with upstream Qt and instead is due to some difference in patching between the Lubuntu Qt patches that are applied and the Kubuntu patches that are applied to the upstream version. Anyhow, those package patches and the equivalent package patches for the Debian cases are the first place I would look for a relevant difference between the various versions that work, and the one or more (Lubuntu and possibly Ubuntu) versions that do not. If you can pin this issue down to a package patch that was applied or not, that is well worth a bug report to Ubuntu since it is in our interest to have Qt working properly on all variants of Ubuntu. Alan __________________________ Alan W. Irwin Astronomical research affiliation with Department of Physics and Astronomy, University of Victoria (astrowww.phys.uvic.ca). Programming affiliations with the FreeEOS equation-of-state implementation for stellar interiors (freeeos.sf.net); the Time Ephemerides project (timeephem.sf.net); PLplot scientific plotting software package (plplot.sf.net); the libLASi project (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project (lbproject.sf.net). __________________________ Linux-powered Science __________________________ ------------------------------------------------------------------------------ BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT Develop your own process in accordance with the BPMN 2 standard Learn Process modeling best practices with Bonita BPM through live exercises http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_ source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
