Hi all, I recently installed virtual machines for Ubuntu, Fedora and Window on my MacOS laptop. This enables me to test the efficiency of TeXmacs on these different platforms, as well as the Qt-port. Surprisingly, the different OS's greatly vary in efficiency for the same version of TeXmacs, with the same compiler and the standard installation procedure. Ubuntu and Fedora (32 bits) are the last versions downloaded from the web. MacOS Tiger and Windows XP.
For my first test, I have measured the time to load my lecture note inside TeXmacs. Here are the results: MacOS, plain 19 sec MacOS, --disable-fastalloc 30 sec MacOS, --enable-qt 34 sec Ubuntu, plain 10 sec Ubuntu, --disable-fastalloc 19 sec Ubuntu, --enable-qt 19 sec Fedora, plain 26 sec Fedora, --disable-fastalloc 34 sec Fedora, --enable-qt 39 sec Windows, --enable-qt 30 sec Conclusion, Ubuntu really seems to outperform all other OS's by a non-trivial factor, despite the fact that it runs in a virtual machine. The standard TeXmacs memory allocation scheme also consistently outperforms the standard one (--disable-alloc, which is default when using Qt). For my second test, I tried to track down the memory leak for Qt-TeXmacs. I load "Help -> Manual -> Typing simple texts" and look at the memory usage. Inside the document, I next scroll down to the bottom (page-down) and back up (page up) 25 times. I again look at the memory usage. Here are the results in Mb (numbers correspond to the columns in 'top' about memory usage) MacOS, plain 24/1/32/61 -> 25/1/33/62 MacOS, --disable-fastalloc 23/1/31/59 -> 25/1/32/60 MacOS, --enable-qt 43/16/59/319 -> 73/16/90/349 Ubuntu, --enable-qt 71/47/13 -> 77/52/13 Fedora, plain 54/36/7 -> 55/37/7 Fedora, --enable-qt 75/47/14 -> 80/52/14 Conclusion, the memory leak is not due to disabling fast memory allocation. It is both present under Mac OS and under Linux, but much stronger for Mac OS. I did not find a top command for Windows, so I could not test yet. Notice also that, without Qt, the memory usage stabilizes after one single scroll down and up. At any rate, the memory leak is currently the main obstacle to the use of Qt-TeXmacs: I tried to write an article some time ago, and went out of memory after about 15 minutes... Best wishes, Joris _______________________________________________ Texmacs-dev mailing list Texmacs-dev@gnu.org http://lists.gnu.org/mailman/listinfo/texmacs-dev
