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shared libraries [ab]useshared libraries [ab]usePosted Aug 4, 2005 22:16 UTC (Thu) by dann (subscriber, #11621)In reply to: shared libraries [ab]use by hp Parent article: Our bloat problem
OK, ignore the clock then, let's look at any other applet, just as an example:
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shared libraries [ab]use Posted Aug 5, 2005 1:51 UTC (Fri) by hp (subscriber, #5220) [Link] Those specific ones must be gnome-vfs then, for https and authentication.
It's simple enough to cut down library deps for certain apps, but I doubt it makes much real performance difference. (unused code isn't mapped anyway)
Maybe it does, but that's why real data is needed.
shared libraries [ab]use Posted Aug 5, 2005 13:11 UTC (Fri) by dmantione (guest, #4640) [Link] No, that's the wrong assumption. Shared libraries are less expensive thanstatically linked ones, but not free.
shared libraries [ab]use Posted Aug 5, 2005 20:25 UTC (Fri) by hp (subscriber, #5220) [Link] Avoiding anything "not free" isn't a useful guideline.
The question is what are the tradeoffs. In the shared lib case, for example, avoiding them often means efficiency loss:
So if shared libs aren't a significant percentage of the overall problem, then "not free" is irrelevant; if they are a significant percentage of the overall problem then "not free" is probably more an argument for fixing shared libs (or coming up with some less-broken module system than ELF shared libs) rather than an argument for static linking and hand-rolled broken code.
Simplistic answers like "just don't use libs" are not useful. You don't want to warp the UI and implementation of every app in extensive ways just to work around a module system that needs optimizing.
shared libraries [ab]use Posted Aug 7, 2005 20:45 UTC (Sun) by oak (guest, #2786) [Link] I think the argument was that each *redundant* (unused) shared librarylinked to the binary has a cost. For example: Just by linking a library (that your program doesn't use), you've increased your program's memory usage by at least 4KB. At least one private (non-read-only) page is reserved for symbol resolving of each linked shared library. The new linker has a command line option to not to link dynamically libraries that are not used. I think it was discussed on the Gnome mailing lists, but globally enabling it had broken some program, so it's not enabled by default.
shared libraries [ab]use Posted Aug 5, 2005 16:38 UTC (Fri) by dann (subscriber, #11621) [Link] Well, using lots of shared libraries affects the startup time.Here's an example:
echo 'int main (void) {return 0;}' > t.c
gcc t.c -lgnomevfs-2
Obviously the above is only a small part of the startup time.
Maybe a kernel person can tell us what are the kernel overheads from having lots of shared libraries...
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