Julien, On 4/23/07, Julien BLACHE <[EMAIL PROTECTED]> wrote:
Weiter Leiter wrote: > The "hit" only affects the loader. After relocation is done (i.e. > program is running), there is no difference between a statically and a > dinamically linked executable, concerning performance. That's for the static vs. dynamic library, not for the non-PIC vs. PIC code...
Dynamic library does not mean PIC; with some effort, needs for PIC can probably be removed from OpenSER's to-be libs. OTOH, PIC is only about dynamic libraries, and the only issues concern static and global variables, which are, indeed, addressed using one and respectively two extra steps (ELF's GOT address loaded - as expensive as a function call, but most probably done once at funtion entry - and relocated pointer in GOT dereferenced for non statics - casual memory op cost). This occurs in few cases (even with large libraries), generally, and particularly for the proposed parser library (at a fast sweep, I only identified one non static global and three statics that might even be 'stacked', in this effort). So, OK, PIC can induces a penalty, per textbook manual, but hardly "performance hits". I set aside the number of mainstream PIC libraries. IMHO, shared or static lib is no solid topic. WL.
JB. -- Julien BLACHE <[EMAIL PROTECTED]> Linbox / Free & ALter Soft <http://www.linbox.com>
-- "C is a language that combines all the elegance and power of assembly language with all the readability and maintainability of assembly language."
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