- Главная
- Разное
- Дизайн
- Бизнес и предпринимательство
- Аналитика
- Образование
- Развлечения
- Красота и здоровье
- Финансы
- Государство
- Путешествия
- Спорт
- Недвижимость
- Армия
- Графика
- Культурология
- Еда и кулинария
- Лингвистика
- Английский язык
- Астрономия
- Алгебра
- Биология
- География
- Детские презентации
- Информатика
- История
- Литература
- Маркетинг
- Математика
- Медицина
- Менеджмент
- Музыка
- МХК
- Немецкий язык
- ОБЖ
- Обществознание
- Окружающий мир
- Педагогика
- Русский язык
- Технология
- Физика
- Философия
- Химия
- Шаблоны, картинки для презентаций
- Экология
- Экономика
- Юриспруденция
Java Performance:Biggest Mistakes презентация
Содержание
- 1. Java Performance:Biggest Mistakes
- 2. And this is where I am from
- 5. Can you tell my age by looking at my first computer?
- 6. That’s why I ended up talking about performance
- 7. Nobody wants this …
- 9. Nor this …
- 11. As it leads to this …
- 12. The “War Room” Facebook – December 2012
- 13. And potentially to this …
- 15. And this …
- 17. And that’s why Business doesn’t like it either …
- 18. ~80% of problems caused by
- 19. 6 Situations on WHY this happened, HOW to avoid it
- 21. “Blindly” (Re)use Existing Components
- 22. Requirement: We need a report
- 23. Using Hibernate results in 4k+ SQL Statements
- 25. Not every Architect makes good decisions
- 26. Symptoms HTML takes between 60 and 120s
- 27. Developers built own monitoring void roomreservationReport(int roomid)
- 28. #1: Loading too much data 24889! Calls
- 29. #2: On individual connections 12444! individual connections Classical N+1 Query Problem Individual SQL really
- 30. #3: Putting all data in temp Hashtable
- 31. Custom Measuring Was impacted by Garbage Collection
- 33. Implementation Flaws
- 34. Business Impact requires Action!
- 35. Solution: Cache to the RESCUE!!
- 36. Implementation and Rollout Implemented InMemory Cache Worked well in Load Testing
- 37. Result: Out of Memory Crashes!! Still crashes Problem fixed! Fixed Version Deployed
- 39. Disconnected Teams
- 40. “Teamwork” between Dev and Ops SEV1 Problem
- 41. Solution: Implement a Custom “On Demand” Remote Logger
- 42. Implementation and Rollout Implemented Custom Logger Worked well in Load Testing
- 43. What happened? ~ 1Mio Lock Exceptions in 30 mins
- 44. Root Cause: A special WebSphere Setting!
- 46. “Deployment” Gone Bad!
- 47. Test Environment Production Environment
- 48. Test Environment Production Environment Hibernate,
- 49. Top Contributor Class.getInterfaces Called from Hibernates FieldInterceptionHelper
- 50. Top Methods related to XML Processing Classloading
- 52. #Push without a Plan
- 53. Mobile Landing Page of Super Bowl
- 54. Fifa.com during Worldcup http://apmblog.compuware.com/2014/05/21/is-the-fifa-world-cup-website-ready-for-the-tournament/
- 55. Waiting for Bug Reports
- 56. Look behind the scenes
- 58. Performance Clinic: Bring Your Own App When:
- 59. Quick Demo
- 60. Get it here: http://bit.ly/dttrial YouTube Tutorials: http://bit.ly/dttutorials
- 61. Andreas Grabner Dynatrace Developer Advocate @grabnerandi http://blog.dynatrace.com
And this is where I am from
Слайд 1More on http://blog.dynatrace.com
Dynatrace Free Trial: http://bit.ly/dttrial
Andreas Grabner - @grabnerandi
Java Performance:
Biggest Mistakes
Слайд 18
~80% of problems
caused by ~20% patterns
YES we know this
80% Dev Time
in Bug Fixing
$60B Defect Costs
BUT
$60B Defect Costs
BUT
Слайд 23Using Hibernate results in 4k+ SQL Statements to display 3 items!
Hibernate
Executes 4k+ Statements
Individual Execution VERY FAST
But Total SUM takes 6s
Слайд 26Symptoms
HTML takes between 60 and 120s to render
High GC Time
Assumptions
Bad GC
Tuning
Probably bad Database Performance as rendering was simple
Probably bad Database Performance as rendering was simple
Project: Online Room Reservation System
Слайд 27Developers built own monitoring
void roomreservationReport(int roomid)
{
long startTime = System.currentTimeMillis();
Object
data = loadDataForRoom(roomid);
long dataLoadTime = System.currentTimeMillis() - startTime;
generateReport(data, roomid);
}
long dataLoadTime = System.currentTimeMillis() - startTime;
generateReport(data, roomid);
}
Result:
Avg. Data Load Time: 45s!
DB Tool says:
Avg. SQL Query: <1ms!
Слайд 28#1: Loading too much data
24889! Calls to the Database API!
High CPU
and High Memory Usage to keep all data in Memory
Слайд 29#2: On individual connections
12444! individual connections
Classical N+1 Query Problem
Individual SQL really
<1ms
Слайд 30#3: Putting all data in temp Hashtable
Lots of time spent in
Hashtable.get
Called from their Entity Objects
Слайд 31Custom Measuring
Was impacted by Garbage Collection
Just measured overall time but not
# SQL Executions
Learn SQL and don’t use Hashtables as Workaround
Learn SQL and don’t use Hashtables as Workaround
Lesson Learned
void roomreservationReport(int roomid)
{
long startTime = System.currentTimeMillis();
Object data = loadDataForRoom(roomid);
long dataLoadTime = System.currentTimeMillis() - startTime;
generateReport(data, roomid);
}
Слайд 40“Teamwork” between Dev and Ops
SEV1 Problem in Production
Need access to log
files
Where are they? Can’t get them
Need to increase log level
Can’t do! Can’t change config files in prod!
Слайд 48Test Environment
Production Environment
Hibernate, Classloading, XML – The Key Hotspots
Hibernate, Classloading, XML
– The Key Hotspots
I/O for Web Requests doesn’t even show up!
I/O for Web Requests doesn’t even show up!
That’s Normal: Having I/O for Web Request as main contributor
Слайд 49Top Contributor Class.getInterfaces
Called from Hibernates FieldInterceptionHelper
These calls all originate form thousands
of calls to find item by code
Слайд 50Top Methods related to XML Processing
Classloading is triggered through CustomMonnkey and
the Xalan Parser
Classloading is triggered through CustomMonkey and the Xalan Parser
Слайд 53
Mobile Landing Page of Super Bowl Ad
434 Resources in total on
that page:
230 JPEGs, 75 PNGs, 50 GIFs, …
230 JPEGs, 75 PNGs, 50 GIFs, …
Total size of ~ 20MB
Слайд 54Fifa.com during Worldcup
http://apmblog.compuware.com/2014/05/21/is-the-fifa-world-cup-website-ready-for-the-tournament/
Слайд 58Performance Clinic: Bring Your Own App
When: Thursday, December 18th
Lunch Session: NOON
– 3PM
After Work Session: 4PM – 7PM
Where: Dynatrace Office 404 Wyman Street, Waltham
Register: http://bit.ly/onlineperfclinic
After Work Session: 4PM – 7PM
Where: Dynatrace Office 404 Wyman Street, Waltham
Register: http://bit.ly/onlineperfclinic
Слайд 60Get it here: http://bit.ly/dttrial
YouTube Tutorials: http://bit.ly/dttutorials
Live Q&A Sessions: http://bit.ly/onlineperfclinic
Contact me:
agrabner@dynatrace.com - @grabnerandi
Special Offer:
SaaS VIP Program: http://bit.ly/dtaasvip
Special Offer:
SaaS VIP Program: http://bit.ly/dtaasvip
30 Days Dynatrace Free Trial
