JVM Garbage Collection logs, you do not want to ignore them! - Reversim Summit 2015

•

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A 5 minutes ignite talk about garbage collection pauses and overhead. The talk was given in Reversim Summit 2015 Israel

Reversim
Summit
2015

JVM
Garbage
Collection
logs,
you

do
not
want
to
ignore
them!

Haim Yadid - Performize-IT

3  
2  
1

About
Me:
Haim
Yadid
•22 Years of SW development experience
•Performance Expert
•Consulting R&D
•Training
http://il.linkedin.com/in/haimyadid
lifey@performize-it.com
www.performize-it.com
blog.performize-it.com
https://github.com/lifey
@lifeyx

GC
•You allocate
• myObject = new MyClass(2015)
•GC cleans
•So everything is cool !

Responsiveness?

Overhead
GCtime

—————

Total
Time

Logging GC activity
Add the following to the command line
-XX:+PrintGCDetails
-XX:+PrintGCTimeStamps
-XX:+PrintGCDateStamps
-Xloggc:<logfile>

When should I use it ?
Always
In production ?

Log File Rotation
-XX:+UseGCLogFileRotation
Control log file size
-XX:GCLogFileSize=1000
Number of log files
-XX:NumberOfGCLogFiles=10
Starting from Java 7
Tuning Memory: Tuning GC

The GC Log
2014-03-04T14:58:04.184+0000: 112134.528:
[Full GC [PSYoungGen: 1987780K-
>0K(266920448K)] [ParOldGen: 536855033K-
>340775638K(538269056K)] 538842813K-
>340775638K(805189504K) [PSPermGen: 38132K-
>38120K(67968K)], 310.6279200 secs]
[Times: user=5357.69
sys=2.73,
real=310.64 secs]

Whats nice about GC log
They are not human readable
Takes time and knowledge to understand
Not machine readable
Good luck writing a parser

GCViewer

JClarity: Censum
Commercial product

What can we do about it ?

So what are we doing with it?
Overhead should be
less than 5%
Usually high overhead is due
to heap too small
Make your heap larger and
reduce overhead

So what are we doing with it?
shenandoah
reduce

footprint
Tune

JVM

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JVM Garbage Collection logs, you do not want to ignore them! - Reversim Summit 2015

1. Reversim Summit 2015 JVM Garbage Collection logs, you do not want to ignore them! Haim Yadid - Performize-IT

2. 3   2   1

3.

4. About Me: Haim Yadid •22 Years of SW development experience •Performance Expert •Consulting R&D •Training http://il.linkedin.com/in/haimyadid lifey@performize-it.com www.performize-it.com blog.performize-it.com https://github.com/lifey @lifeyx

5.

6. GC •You allocate • myObject = new MyClass(2015) •GC cleans •So everything is cool !

7.

8. Responsiveness?

9. Overhead GCtime ————— Total Time

10. Logging GC activity Add the following to the command line -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps -Xloggc:<logfile>

11. When should I use it ? Always In production ?

12.

13. Log File Rotation -XX:+UseGCLogFileRotation Control log file size -XX:GCLogFileSize=1000 Number of log files -XX:NumberOfGCLogFiles=10 Starting from Java 7 Tuning Memory: Tuning GC

14. The GC Log 2014-03-04T14:58:04.184+0000: 112134.528: [Full GC [PSYoungGen: 1987780K- >0K(266920448K)] [ParOldGen: 536855033K- >340775638K(538269056K)] 538842813K- >340775638K(805189504K) [PSPermGen: 38132K- >38120K(67968K)], 310.6279200 secs] [Times: user=5357.69 sys=2.73, real=310.64 secs]

15. Whats nice about GC log They are not human readable Takes time and knowledge to understand Not machine readable Good luck writing a parser

17. JClarity: Censum Commercial product

18. What can we do about it ?

19. So what are we doing with it? Overhead should be less than 5% Usually high overhead is due to heap too small Make your heap larger and reduce overhead

20. So what are we doing with it? shenandoah reduce footprint Tune JVM