Oow2013 ef final_4_3

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Euegene Fedorenko

Technologie

About me

Eugene Fedorenko
adfpractice-fedor.blogspot.com

2

Performance Testing
Base

Oracle Solution Center. Linlithgow, Scotland, UK.

Application

JetB2. Core Banking System.
ADF Faces, ADF Controller, ADF Model, ADF BC
JDeveloper R2 11.1.2.3.0

Application Server

Oracle WebLogic 10.3.6
Jrockit VM R28.2.5-4.1.0

Database

Oracle RDBMS 11g R2

Targets

Maximum number of users per JVM, per Box
Minimum number of database connections
Detect memory leaks
Check application scalability
Tune JVM to get the best response time
Get 6000 simultaneously working users

Eugene Fedorenko
adfpractice-fedor.blogspot.com

3

Tools
Oracle Application Testing Suite
Load generating
Response time monitoring

JRockit Mission Control

Online JVM monitoring and flight recording

JRockit Memory Leak Detector
Analyzing heap contents
Detecting memory leaks

Oracle Enterprise Manager Cloud Control
Monitoring database connections
Detecting heavy SQL queries

Oracle Diagnostic Log Analyzer

Exploring request structure and SQL executions

NMON

Gathering operating system statistics

Eugene Fedorenko
adfpractice-fedor.blogspot.com

4

Mission

Eugene Fedorenko
adfpractice-fedor.blogspot.com

5

Let’s go!

Eugene Fedorenko
adfpractice-fedor.blogspot.com

6

The Heap
0

-Xms

-Xmx
java –Xms:4G –Xmx:8G

Hard Reference
Eugene Fedorenko
adfpractice-fedor.blogspot.com

Soft Reference

Weak Reference
7

Garbage Collector
0

-Xmx
Mark

Sweep

Reachable
Eugene Fedorenko
adfpractice-fedor.blogspot.com

Softly Reachable

Weakly Reachable

Garbage
8

Parallel Garbage Collector
Frequent garbage collections (every ~40s)
Long pauses (~8s and longer)
Frequent and huge peaks in response time line

Eugene Fedorenko
adfpractice-fedor.blogspot.com

9

Generational Parallel Garbage Collector
Nursery (Young Generation)

Tenured (Old Generation)

0

-Xmx

Xns

Young Collection

Old Collection

Reachable
Eugene Fedorenko
adfpractice-fedor.blogspot.com

Softly Reachable

Weakly Reachable

Garbage
10

Generational Parallel Garbage Collector
Frequent young GC (every ~8s). Rare old GC (every ~3min)
Short pauses for young GC (<300ms). Quite long pauses for old GC (~3.5s-4s).
Infrequent but still high peaks in response time line

Eugene Fedorenko
adfpractice-fedor.blogspot.com

11

Concurrent Garbage Collector: Mark
Xns
-Xmx

1. Initial Marking

2. Concurrent Marking

3. Precleaning

4. Final Marking

Reachable
Eugene Fedorenko
adfpractice-fedor.blogspot.com

Softly Reachable

Weakly Reachable

Garbage
12

Concurrent Garbage Collector: Sweep
Xns
-Xmx

1. Sweep first half

2. Switch halves

3. Sweep second half

4. Synchronize

Reachable
Eugene Fedorenko
adfpractice-fedor.blogspot.com

Softly Reachable

Weakly Reachable

Garbage
13

Generational Concurrent Garbage Collector
Frequent young GC (every ~8s). Rare old GC (every ~2min 40s)
Short pauses for young GC (<300ms). Short pauses for old GC (<700ms).
Long old GC duration (~12s)

Eugene Fedorenko
adfpractice-fedor.blogspot.com

14

Lessons
Parallel Garbage Collector

High performance between collections
Short collection duration but long pauses
Good for applications with high throughput requirement. Batch processing

Concurrent Garbage Collector

Sharing CPU between GC and Java threads
Long collection duration but short pauses
Good for applications sensitive to long pauses. Transaction based systems

Single-generational Garbage Collector

All garbage is collected at once
Good for set of stable long living objects

Two-generational Garbage Collector

Short-living objects live short
Good for applications with large number of temporary objects

Eugene Fedorenko
adfpractice-fedor.blogspot.com

15

What is good for ADF?
Sensitive to long pauses?
No

No

Single Concurrent

Yes

A lot of temporary objects?

Yes

Single Parallel

-Xgc:singlecon

-Xgc:singlepar

Generational Concurrent

Generational Parallel

-Xgc:gencon

-Xgc:genpar

Eugene Fedorenko
adfpractice-fedor.blogspot.com

16

Useful Links
Understanding Memory Management
http://docs.oracle.com/cd/E13150_01/jrockit_jvm/jrockit/geninfo/diagnos/garbage_colle
ct.html

Tuning the Memory Management System
http://docs.oracle.com/cd/E13150_01/jrockit_jvm/jrockit/geninfo/diagnos/m
emman.html

JRockit GC in Action
http://java.dzone.com/articles/jrockit-gc-action

Eugene Fedorenko
adfpractice-fedor.blogspot.com

17

Mission Completed

Eugene Fedorenko
adfpractice-fedor.blogspot.com

18

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Oow2013 ef final_4_3

2. About me Eugene Fedorenko adfpractice-fedor.blogspot.com 2

3. Performance Testing Base Oracle Solution Center. Linlithgow, Scotland, UK. Application JetB2. Core Banking System. ADF Faces, ADF Controller, ADF Model, ADF BC JDeveloper R2 11.1.2.3.0 Application Server Oracle WebLogic 10.3.6 Jrockit VM R28.2.5-4.1.0 Database Oracle RDBMS 11g R2 Targets Maximum number of users per JVM, per Box Minimum number of database connections Detect memory leaks Check application scalability Tune JVM to get the best response time Get 6000 simultaneously working users Eugene Fedorenko adfpractice-fedor.blogspot.com 3

4. Tools Oracle Application Testing Suite Load generating Response time monitoring JRockit Mission Control Online JVM monitoring and flight recording JRockit Memory Leak Detector Analyzing heap contents Detecting memory leaks Oracle Enterprise Manager Cloud Control Monitoring database connections Detecting heavy SQL queries Oracle Diagnostic Log Analyzer Exploring request structure and SQL executions NMON Gathering operating system statistics Eugene Fedorenko adfpractice-fedor.blogspot.com 4

5. Mission Eugene Fedorenko adfpractice-fedor.blogspot.com 5

6. Let’s go! Eugene Fedorenko adfpractice-fedor.blogspot.com 6

7. The Heap 0 -Xms -Xmx java –Xms:4G –Xmx:8G Hard Reference Eugene Fedorenko adfpractice-fedor.blogspot.com Soft Reference Weak Reference 7

8. Garbage Collector 0 -Xmx Mark Sweep Reachable Eugene Fedorenko adfpractice-fedor.blogspot.com Softly Reachable Weakly Reachable Garbage 8

9. Parallel Garbage Collector Frequent garbage collections (every ~40s) Long pauses (~8s and longer) Frequent and huge peaks in response time line Eugene Fedorenko adfpractice-fedor.blogspot.com 9

10. Generational Parallel Garbage Collector Nursery (Young Generation) Tenured (Old Generation) 0 -Xmx Xns Young Collection Old Collection Reachable Eugene Fedorenko adfpractice-fedor.blogspot.com Softly Reachable Weakly Reachable Garbage 10

11. Generational Parallel Garbage Collector Frequent young GC (every ~8s). Rare old GC (every ~3min) Short pauses for young GC (<300ms). Quite long pauses for old GC (~3.5s-4s). Infrequent but still high peaks in response time line Eugene Fedorenko adfpractice-fedor.blogspot.com 11

12. Concurrent Garbage Collector: Mark Xns -Xmx 1. Initial Marking 2. Concurrent Marking 3. Precleaning 4. Final Marking Reachable Eugene Fedorenko adfpractice-fedor.blogspot.com Softly Reachable Weakly Reachable Garbage 12

13. Concurrent Garbage Collector: Sweep Xns -Xmx 1. Sweep first half 2. Switch halves 3. Sweep second half 4. Synchronize Reachable Eugene Fedorenko adfpractice-fedor.blogspot.com Softly Reachable Weakly Reachable Garbage 13

14. Generational Concurrent Garbage Collector Frequent young GC (every ~8s). Rare old GC (every ~2min 40s) Short pauses for young GC (<300ms). Short pauses for old GC (<700ms). Long old GC duration (~12s) Eugene Fedorenko adfpractice-fedor.blogspot.com 14

15. Lessons Parallel Garbage Collector High performance between collections Short collection duration but long pauses Good for applications with high throughput requirement. Batch processing Concurrent Garbage Collector Sharing CPU between GC and Java threads Long collection duration but short pauses Good for applications sensitive to long pauses. Transaction based systems Single-generational Garbage Collector All garbage is collected at once Good for set of stable long living objects Two-generational Garbage Collector Short-living objects live short Good for applications with large number of temporary objects Eugene Fedorenko adfpractice-fedor.blogspot.com 15

16. What is good for ADF? Sensitive to long pauses? No No Single Concurrent Yes A lot of temporary objects? Yes Single Parallel -Xgc:singlecon -Xgc:singlepar Generational Concurrent Generational Parallel -Xgc:gencon -Xgc:genpar Eugene Fedorenko adfpractice-fedor.blogspot.com 16

17. Useful Links Understanding Memory Management http://docs.oracle.com/cd/E13150_01/jrockit_jvm/jrockit/geninfo/diagnos/garbage_colle ct.html Tuning the Memory Management System http://docs.oracle.com/cd/E13150_01/jrockit_jvm/jrockit/geninfo/diagnos/m emman.html JRockit GC in Action http://java.dzone.com/articles/jrockit-gc-action Eugene Fedorenko adfpractice-fedor.blogspot.com 17

18. Mission Completed Eugene Fedorenko adfpractice-fedor.blogspot.com 18

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