Statement for Report2 ** upd ** Due 31Oct03 (announced 28oct03)
29 October 03 **update**

Wednesday (08Oct03) Lecture presented the background to characterize the computer solution of the Diffusion Model

Sample codes are available today (13Oct03) so that you may begin crafting your own experiment.

• mkdir diffusion
• cd diffusion
• cp ~stewart/cs575/fall03/diffusion/* . (do not forget the final "dot".)
• Now with the Fortran source codes sgeco.f, sgesl.f, blas.f.

---

Fortran Programmers:
f90 -o fdiff f_diffusion.f -xlic_lib=sunperf    
and you can explore the effect on timing by looking at different 
optimization levels using the 
-O
option on the compile line, e.g. -O2 or -O4 or such.
---------------------------------------
C Programmers:
cc -o cdiff c_diffusion.c -xlic_lib=sunperf
and you can explore the effect on timing by looking at different
optimization levels using the 
-O
option on each of the compile lines
----------------------------------------

• f90 -o fdiff-sunperf f_diffusion.f -xlic_lib=sunperf
• f90 -o fdiff-source f_diffusion.f sgeco.f sgesl.f blas.f

or, for those working in C

• cc -o cdiff-sunperf c_diffusion.c -xlic_lib=sunperf
• f77 -c sgeco.f sgesl.f blas.f
• cc -o cdiff-source c_diffusion.c sgeco.o sgesl.o blas.o -lm -lF77
• (-lm -lF77 will resolve the math library and Fortran 77 library references the linker needs)

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Second Report (due Oct. 31 Web Page & Hard Copy), what to discover from your code.

• At appropriate locations in the source code, add calls to the system timer dtime. Optionally, explore the use of the C-based sytem timer gethrtime man gethrtime
• Gather data to compare the run-time performance of using the source code from Linpack, sgeco.f, sgesl.f, and blas.f for various system sizes. How large must N be for our expected algorithmic Operations Counts to be validated?
• Compare the compiled source code performance with the Sun Performance Library, as linked above.
• Write your report, assign2.html, as both a web-page in your class account and a hardcopy print out, due on 31 October 03. Send email notice to stewart@rohan.sdsu.edu when the web-page is ready to be viewed.

Recall, your code needs to produce data to support conclusions in your report.
You may wish to review the lab discussion on Problem Solving Skills