Jvm Performance Tunning
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JVM performance tuning guide. describes JVM memory structure and explains gc mechanism. and guide for tuning jvm.
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Jvm Performance Tunning
- 1. JavaStudy Network Daehyub Cho JVM [Java Virtual Machine] Performance Tuning
- 2. AGENDA Basic concept of JVM Tuning 1 Hotspot compiler 2 Threading Model 3 Memory Model 4
- 3. Basic Concept of JVM Tuning Basic concept of JVM Tuning
- 6. Hotspot Compiler Hotspot compiler
- 17. Solaris M:N Thread Model Java Application Java Thread JVM Solaris OS OS Kernel Solaris Thread LWP Kernel Thread
- 19. Solaris 1:1 Thread Model Java Application Java Thread JVM Solaris OS OS Kernel Solaris Thread LWP Kernel Thread
- 21. JVM Performance Test on Solaris < Solaris 8 with JVM 1.3 > See next page graph!! Architecture Cpus Threads Model %diff in throughput (against Standard Model) Sparc 30 400/2000 Standard --- Sparc 30 400/2000 LWP Synchronization 215%/800% Sparc 30 400/2000 Bound Threads -10%/-80% Sparc 30 400/2000 Alternate One-to-one 275%/900% Sparc 4 400/2000 Standard --- Sparc 4 400/2000 LWP Synchronization 30%/60% Sparc 4 400/2000 Bound Threads -5%/-45% Sparc 4 400/2000 Alternate One-to-one 30%/50% Sparc 2 400/2000 Standard --- Sparc 2 400/2000 LWP Synchronization 0%/25% Sparc 2 400/2000 Bound Threads -30%/-40% Sparc 2 400/2000 Alternate One-to-one -10%/0% Intel 4 400/2000 Standard --- Intel 4 400/2000 LWP Synchronization 25%/60% Intel 4 400/2000 Bound Threads 0%/-10% Intel 4 400/2000 Alternate One-to-one 20%/60% Intel 2 400/2000 Standard --- Intel 2 400/2000 LWP Synchronization 15%/45% Intel 2 400/2000 Bound Threads -10%/-15% Intel 2 400/2000 Alternate One-to-one 15%/35%
- 23. Memory Tuning Memory Model
- 29. Minor GC Eden SS1 SS1 Copy live objects to Survivor area New Object Garbage Lived Object 1 st Minor GC Old Old Old
- 30. Minor GC 2 nd Minor GC Old Old Old New Object Garbage Lived Object
- 31. Minor GC OLD 3 rd Minor GC Objects moved old space when they become tenured New Object Garbage Lived Object
- 33. Major GC Eden SS1 SS2 Eden SS1 SS2 Mark the objects to be removed Eden SS1 SS2 Compact the objects to be removed
- 46. Best Pause Concurrent GC Best Throughput Parallel GC Better Pause Incremental GC(Train) Better throughput Mark-compact
- 50. GC Log analysis using AWK script < GC Time >
- 51. GC Log analysis using HPJtune ※ http://www.hp.com/products1/unix/java/java2/hpjtune/index.html
- 52. GC Log analysis using AWK script < GC Amount >
- 55. Jmeter / Threads Histogram
- 56. Jmeter /Threads Group Histogram
- 57. Example
- 58. Example 2004-01-08 오후 7:14 2004-01-09 오전 8 시 전후 2004-01-09 오후 7 시 전후 금요일 업무시간 2004-01-10 오전 10 시 전후 2004-01-10 오후 6 시 전후 PEAK TIME 52000~56000 sec 9 시 ~ 1 시간 가량 Before Tuned Old Area
- 59. Example Peak Time 시에 Old GC 시간이 4~8 sec 로 이로 인한 Hang 현상 유발이 가능함 Before Tuned GC Time
- 60. Example 12 일 03:38A 12 일 05:58P 13 일 07:18A 13 일 09:38P 14 일 11:58A 15 일 01:18A 15 일 03:38P 16 일 05:58A 16 일 07:18P 17 일 08:38A 17 일 10:58P Weekend Mon Office Our Tue Office Our Thur Office Our Fri Office Our After AP Tuned GC Time
- 61. Example 12 일 03:38A 12 일 05:58P 13 일 07:18A 13 일 09:38P 14 일 11:58A 15 일 01:18A 15 일 03:38P 16 일 05:58A 16 일 07:18P 17 일 08:38A 17 일 10:58P Weekend Mon Office Our Tue Office Our Thur Office Our Fri Office Our
- 62. Summary
- 64. More Tips More Tips
- 71. Thank you