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Great ways to improve java performance
- 2. Why performance is so important? Java 2 www.sainivas.com
- 3. Imagine a world where everything is UNLIMITED 3 www.sainivas.com
- 4. Sorry!!You are in a world where everything is LIMITED 4 www.sainivas.com
- 5. Why performance matters? 90% of requirements are complex 50% of apps share the same server 10% increase in end users every day Performance should be planned initially and not inspected later. 5 www.sainivas.com
- 6. Great ways to improveJava Performance By B. Sai Prasad 6 www.sainivas.com Simple
- 7. Introduction Java Puzzles Short program Where is the issue? How to fix? What did you learn? 7 www.sainivas.com
- 8. Puzzle #1 8 www.sainivas.com
- 9. Moral #1new operator creates a new object “new operator can be avoided by re-using byte arrays, or re-using objects” 9 www.sainivas.com
- 10. Puzzle #2 10 www.sainivas.com
- 11. Moral #2Creating a Double from a string takes about 15 times than from a number “Use primitive data types for constructors rather than String objects.” 11 www.sainivas.com
- 12. Puzzle #3 12 www.sainivas.com
- 13. Moral #3length() call in a tight loop can hit performance “String length is pre-computed, stored in a local variable and used it in a tight loop” 13 www.sainivas.com
- 14. Puzzle #4 14 www.sainivas.com
- 15. Moral #4Default constructor is added automatically by compiler. “Generated constructor invokes the super class constructor.” 15 www.sainivas.com
- 16. Puzzle #5 16 www.sainivas.com
- 17. Moral #5Minimize method calls by method inlining “Inlining is done by expanding the inlined method’s code in the code that calls the method” 17 www.sainivas.com
- 18. Puzzle #6 18 www.sainivas.com
- 19. Moral #6System.arraycopy()efficiently copies one array to another “For very short arrays, use of this method may be counterproductive, because of overhead in actually calling the method” 19 www.sainivas.com
- 20. Puzzle #7 20 www.sainivas.com
- 21. Moral #7BufferedReader reads characters in chunks “the read() method found in BufferedReader simply returns characters from a buffer” 21 www.sainivas.com
- 22. Puzzle #8 22 www.sainivas.com
- 23. Moral #8Reuse. Reuse. Reuse. “It is better to reuse the java libraries than creating something new” 23 www.sainivas.com