Compiling (was RE: [SPARCbook] re: linux on GX)

[whofmann at yahoo.com]

Thanks for all of your info, but I have one remaining quesiton:
What would be the optimum gcc command to compile software under the
SparcBook?

Thanks!

Wes

>
> whofmann at yahoo.com wrote:
> > I'll agree with that.  At work, my workstation is an
> Ultra10/Creator3D.
> > What I've found to be very nice is using the following
> value for CFLAGS,
> > "-O2 -msupersparc" when compiling software on my Ultra
> running Solaris 2.6.
> > I can then just copy the binaries in /usr/local over to my
> sparcbook (also
> > running solaris 2.6).  Needless to say, the ultra compiles
> MUCH more quickly
> > than my sparcbook.  The quesiton is, since they have two different
> > processors, WHY are they binary compatible?  What compiler
> flags SHOULD I be
> > using on the ultra?  On the sparcbook?  Is there a problem
> with what I've
> > been doing?  Any input on this would be greatly appreciated.
>
> the Ultra is SPARC v9 architecture, and is a superset of SPARC v8 (the
> supersparc is included in v8).
>
> in other words, when you compile with -O2 -msupersparc,
> you're building
> a binary optimized for supersparc chips (which btw, your
> tadpole isn't,
> it's
> a microsparc II)  Something like an SS10 or SS20 would be a supersparc
> (unless it were using ROSS modules, in which case it would be a
> hypersparc).
>
> at any rate, super, micro, microII, and cypress are all different
> implementations of the sparc v8 architecture.  -msupersparc
> will just tell
> the compiler to do scheduling optimizations based on the supersparcs
> internal architecture (multiple issue, cache size
> assumptions).  THis may
> be less than optimum on your tadpole.  It is certainly less
> than optimum on
> the Ultra, but not that bad.
>
> For maximum performance out of the ultra you'd probably want
> to specify
> sparc v9 instructions.  currently, gcc can't do this to the best of my
> knowledge.  the best you can do with gcc is probably something like
>
> gcc -O3 -mv8
>
> for your tadpole
>
> if you have Sun's cc/CC, you can do much better IMO.  things like
>
> cc -O5 -xchip=super exist.  you can even specify the L1/L2
> caches sizes of
> the target processor.  Sun's cc is very comprehensive. if you have it
> available
> somewhere, to get the best performance out of your tadpole,
> you might try
>
> cc -xO4 -xtarget=ss5
>
> Note that this is as of SC 4.2.  5.0 probably has more options and
> features,
> and better support for ultra machines.
>
> --
> Matt Evans     email: mevans at cse.unl.edu      web:
> www.loathe.com/~bmajik
> "And God saw that the wickedness of man was great in the
> earth, and that
> every imagination of the thoughts of his heart was only evil
> continually."
> 	- Genesis 6:5
>
> _______________________________________________
> Sparcbook mailing list  -  Sparcbook at sunhelp.org
> http://www.sunhelp.org/mailman/listinfo/sparcbook
>


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