cc -O4 on X11R3 server

[Mario Wolczko]

>  I am also going to try recompiling the X server with cc -O4 (instead of
>  the default -O2).  

I have already done this on both Sun3 and Sun4, and the server is somewhat
smaller and a fair bit faster.  It's been in use for a few weeks among a
dozen or so users, and no unusual behaviour has been reported.  (Oh yes, I
applied the purdue 2.0 patches first).

Be warned though: compiling the bitblt modules mfbbitblt and cfbbitblt
requires over 30Mb of stack space!  You need to do a "limit stack 35m"
before it will work.  Also, if you don't have 32Mb of real memory, your
machine will probably thrash.  I tried this on an otherwise idle 8Mb 3/60,
and iropt only got 60mins CPU in a 12 hour period.  This prevented me from
applying -O4 to these modules on a Sun3, as we don't have one that big
running SunOS4.0.

Mario Wolczko

Dept. of Computer Science    Internet:   mario at ux.cs.man.ac.uk
The University               USENET: mcvax!ukc!man.cs.ux!mario
Manchester M13 9PL           JANET:      mario at uk.ac.man.cs.ux
U.K.                         Tel: +44-61-275 6146  (FAX: 6280)