In the last episode (Jul 16), Jeremy Zawodny said: > On Mon, Jul 07, 2003 at 10:57:52AM -0500, Dan Nelson wrote: > > In the last episode (Jul 07), Nils Valentin said: > > > Thank you for the superfast reply. I actually was looking for > > > other information. I understood the actual feature difference of > > > the standard and f.e max version. Sorry if this didnt came out > > > so clear. I will try to make it clearer. > > > > > > My question was more aiming at what advantages the dynamically > > > linking or the statically linking have (except the memory usage > > > of course). I was thinking when given 2 times the same versions > > > once linked statically and once linked dynamically which one > > > would have which advantages in regards to performance, > > > reliability etc. ? > > > > You can't call dlopen() on a statically-linked binary, so you can't use > > UDFs. On the other hand, static binaries usually run ~20% faster. > > 20%?! > > That seems like a high number. Have you actually seed that much of a > boost?
I have, but I haven't tested long-lived monolithic programs like mysql. The big penalties you pay for shared linking are much higher startup overhead, the requirement that your shared libraries be compiled with -fPIC (thus losing a register), and the possible cost of a lookup in a jump table whan calling functions from one library into another. Startup time isn't a problem for mysql, and the server code isn't built out of shared libraries, so a statically-linked mysql might not really buy you that much. http://groups.google.com/groups?selm=3E74E3FB.D08EB9AC%40doe.carleton.ca and http://groups.google.com/groups?threadm=k7clgvoqjur1f10mosue3os74vv7nd34hi%404ax.com talk a bit about the penalties of using shared libs, but they're really from the point of view of the library author and relative speeds of shared libs vs static libs. A dynamically-linked program that spends most of its time in its own code (as opposed to doing function calls to CPU-intensive routines in libraries) will probably not see much of a difference. -- Dan Nelson [EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
