Shared libraries (was Re: Window system bashing (was Re: X11 bashing))

[Larry McVoy]

bzs at world.std.com (Barry Shein) writes:
> >Dynamically linked shared libraries (a la Sun) will incur a performance hit,
> >but it is completely misleading to talk about the hit in percentage terms.
> 
> Have you actually made any attempt to measure this effect? Or are you
> just drawing conclusions from a few facts you have lying around?

I have (made an attempt to measure it).  I measured:

	main() { exit(0); }

statically and dynamically on an SS1 (20 MHZ sparc).  I found that
dynamically linked version cost about 20milliseconds more than
statically linked version.

I do not know (not having measured it and not really groking how
dynamic linking works) if each libc reference costs 20milliseconds on
first reference.   I hope not.
---
Larry McVoy, Sun Microsystems     (415) 336-7627       ...!sun!lm or lm at sun.com