Re: Two questions, -gp and why is it slow?

On Thu, 2005-07-07 at 15:11 +0000, Brandon Heller wrote:
> For a project, I need to generate profile information on SableVM with gprof. 
> I can successfully compile sableVM on a SuSE machine and run sableCC as a 
> benchmark on it.  After running configure, I modified the makefile in 
> sablevm-sdk/sablevm by adding the -gp option to both CFLAGS and CXXFLAGS.  I 
> then ran 'make' and 'make install', yet the profile information (gmon.out) 
> wasn't created. I'm wondering if this option must be specified in the 
> configure file, and if so, how one might do that.  I'm using new 1.12 release.

Don't modify the Makefiles generated by configure, as the changes won't
automatically propagate, especially in situations where configure itself
gives you everything you need:

./configure other-options CFLAGS='-gp other cflags' other-options

> These times were from an unloaded P4 2.6Ghz with 512MB RAM and HT, yet the 
> times are much slower than the 1.5GHz 1.5GB RAM machine from Etienne's thesis 
> paper.  Is the sablecc benchmark heavily memory-dependent, have I missed a 
> 'debug' compiler switch, did the Simple C file change, or is something else to 
> blame for this discrepancy?

I cannot say for sure the situation then, but I think now egagnon
usually uses PPC.  I think a 1.5GHz PPC might be faster than your P4 in
such cases.  Oh, I really don't know hardware that well.

--
I am away from my computer right now.
Sorry, I ran out for a bit!