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Working with GALPROP

Melinda Guzman and Samantha Chacon Electrical and Computer Engineering Drs. Steve Stochaj, Heather Pfeiffer, Jeanine Cook URA. Working with GALPROP. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION. Outline. Science Background

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Working with GALPROP

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  1. Melinda Guzman and Samantha Chacon Electrical and Computer Engineering Drs. Steve Stochaj, Heather Pfeiffer, Jeanine Cook URA Working with GALPROP NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION

  2. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION Outline • Science Background • Code Background • CPA Background • Examples • Test, Result and Analysis • Pit Falls • Challenges • Future Work

  3. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION Science Background • Computational Astrophysics • Using a computer to numerically solve research problems • Computers are being used because the models for describing the astrophysical systems are complex • Understanding Astrophysics • The study of stars, planets and asteroids • What is visible in the sky (Universe) • Understand the Universe

  4. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION Science Background • Understanding the Universe • Means having a type of model that will predict phenomena that has yet to be observed but will be in the near future • Focus on cosmic rays • Fast moving charged particles that spread through the galaxies • Important ingredient for the interstellar medium • Interstellar medium is the space between the stars

  5. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION Interstellar Medium InterstellarMedium Courtesy of Dr. Steve Stochaj

  6. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION Science Background • Galaxies • Collection of multiple stars and interstellar matter • Milky Way • Galaxy we live in

  7. Milky Way

  8. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION Dark Matter • We all know what matter is: person, place, or thing • When it comes to dark matter we don't know what it is for sure • Theorized to be matter which is invisible with the direct measurement • Science has proven it exists in our Universe • Many unanswered questions about dark matter

  9. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION Dark Matter

  10. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION Dark Matter

  11. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION Code Background • GALPROP • Provided Stanford University • Supported by NASA • Numerical Modeling systems • Perform cosmic-ray propagation calculations • The set of model parameters take large amounts of computer time • Complex programs • Test parameters

  12. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION Challenges of Working with GALPROP • Learn more about Linux • In general • Familiarize with the commands • Why it needs to be specific in the code • Compiling the program • Running the program so we get an output • Pit Falls

  13. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION CPA Background • Computer Performance Analysis over all goals • Improve performance • Mix and match to see which computer architecture will maximize the program's abilities • Compare and match computational requirements with the physical attributes of a computer platform

  14. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION CPA Review • Computer Performance Analysis • Profiling • Determine which portion of the code takes the most computer time • Improve the speed • Want the program to run as fast as possible • Perform a trace analysis • How the program runs on different architectures

  15. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION CPA Review • Computer Performance Analysis (continued) • Test various computer architectures • Meet the specifications of the code while maintaining the speed

  16. long fibonacci_i( int k ) { long term = 1, prev1 = 1, prev2 = 1; int n; if (k > 1)‏ { for(n=2; n<=k; n++)‏ { term = prev1 + prev2; prev2 = prev1; prev1 = term; } } return term; }/* fibonacci_i */ NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION A Sample Function for Analysis #include <stdio.h> long fibonacci_i( int k ); int main( void ) { int n; printf("Enter a positive integer number -> "); scanf("%d", &n); printf("Iterative Fibonacci number = %ld\n", fibonacci_i(n)); return 0; }/* main */

  17. Sample Function GPROF Results

  18. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION Test and Results • Write a c-code • Compile the code • Make the necessary changes if needed • Analyze the results • Graph the results to retrieve a better visual understanding of the

  19. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION Analysis • From the graphs , we can see that GALPROP takes a lot of time with certain functions • From here we can determine which areas to focus on that need the most improvement • The data cannot be compared until we run it on different computer architectures

  20. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION Pit Falls • The system can be down (Aussie) • Time consuming (running programs) • Varies in complication ( skills we lack)

  21. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION Future Work • Test GALPROP on the different architectures • Re- Analyze the output • Optimize the code • Enhance the speed performance

  22. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION References • http://imagine.gsfc.nasa.gov/docs/science/know_l1/dark_matter.html • http://galprop.stanford.edu/web_galprop/galprop_home.html • http://www2.lns.mit.edu/~LQS/Milky_Way_galaxy_sun05.jpg • http://en.wikipedia.org/wiki/Dark_matter

  23. NEW MEXICO AMP ALLIANCE FOR MINORITY PARTICIPATION Special Thanks • Special thanks to Dr.Steve Stochaj, Dr. Heather Pfeiffer, and Dr. Jeanine Cook for giving us the opportunity to be a part of this research project. • Jeanne Garland, URA NSF HRD 083171

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