Contents

• 0. Preface
• 0.1. Acknowledgments
• 1. Performance
• 1.1. A Matter of Speed
• 1.2. Energy Conservation
• 1.3. Timing
• 1.4. The Next Step
• 1.5. Two Orders of Magnitude Speedup?
• 2. Ruby versus C
• 2.1. Raw Floating Point Speed
• 2.2. Slooow
• 2.3. At Least Not Slower
• 2.4. Not So Quick
• 2.5. Wanna Bet?
• 2.6. Surprise
• 2.7. Wonderful
• 3. Tuning Ruby
• 3.1. Pairing Pairwise Calculations
• 3.2. A Need for Library Structure
• 3.3. From Body to Nbody
• 3.4. Looping Options
• 3.5. The calc Methods
• 3.6. Integrators
• 3.7. The Leapfrog
• 3.8. Brevity
• 4. xx
• 4.1. Testing
• 4.2. Little Speedup, So Far
• 4.3. xxx
• 5. links
• 6. Literature References