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Open	Sourcing	the	IBM	J9
Java	Virtual	Machine
Mark	Stoodley
an	Eclipse	OpenJ9	Project	Lead
an	Eclipse	OMR	Project	Lead
Ste...
Important	disclaimers
• THE	INFORMATION	CONTAINED	IN	THIS	PRESENTATION	IS	PROVIDED	FOR	INFORMATIONAL	PURPOSES	ONLY.
• WHIL...
J9
JVM
Open	source	projects	at	
Eclipse	Foundation
2016/2017	and	on
Closed	source	development
at	IBM
1997	– 2016/2017
OMR
...
This	presentation:
• Why	open	source	the	J9	JVM?
• How	do	OpenJDK and	OpenJ9	fit	together?
• Performance	of	OpenJDK with	O...
Why	open	source	the	J9	JVM?
5
J9	JVM	a	central	hub	for	innovation	within	IBM
6
Cognitive Analytics
Cloud
Business	Insights
Application	
Platform
Microso...
Over	the	last	20	years…
Developer	mindset	has	changed	dramatically
Developers	are	choosing	to	use	open	source
And	our	empl...
Impact	to	J9	JVM	as	hub	for	innovation?
8
Cognitive Analytics
Business	Insights
Application	
Platform
Microsoft®
Windows®
...
Proprietary	J9	JVM	cannot	reach	developers!
9
Cognitive Analytics
Cloud
Business	Insights App	Platform
Microsoft®
Windows®...
All	the	innovation	we	have	been	pouring
into	J9	JVM	cannot	reach
the	developers we	built	it	for
Boo!	L
10
Wait,	what	innovation?
11
Adaptive	compilation	(6	levels)
since	1999
(you	probably	know	it	as	“tiered	compilation”)
12
Escape	analysis	and	stack	allocation
since	2001
13
Class	sharing
(even	for	application	classes)
since	2005
14
Metronome
soft	real-time	GC	policy
(GC	pauses	as	low	as	1ms)
since	2006
15
Application	phase	detection
feeding	compilation	heuristics
since	2006
16
Dynamic	Ahead	of	Time	(AOT)
compiled	code
since	2007
17
Compressed	references
since	2007
18
Idle	time	optimizations
since	2007
19
Balanced	(region-based)	GC
since	2011
20
Hardware	Transactional	Memory
support	in	our	JIT	compiler
since	2013
21
Auto	SIMD	(vector)	and	Auto	GPU
in	our	JIT	compiler
since	2014
22
Eclipse	OMR
Sharing	runtime	technology	with	other	languages
Proof	of	concept	ports	for	Swift,	Lua,	Ruby,	
Smalltalk,	Rosie...
Pause-less	GC	support
on	latest	z14	processors
2017
24
Everything	I	just	showed
operates	in	production	in	IBM	J9
25
Everything	I	just	showed
operates	in	production	in	IBM	J9
and	has	now	been	open	sourced	as
Eclipse	OpenJ9	and Eclipse	OMR!...
J9
JVM
Open	source	projects	at	
Eclipse	Foundation
2016/2017	and	on
Closed	source	development
at	IBM
1997	– 2016/2017
1.5M...
3	releases	shipped	from	open	source	branches
28
Dec
2013
J9	“R27”
(Java	7	JCL)
J9	master
branch
Feb
2015
J9	“R28”
(Java	8	...
https://www.eclipse.org/openj9
29
https://github.com/eclipse/openj9
But	do	we	need	another	open	source	JVM?
30
Yes!
JVM	competition	is	healthy	and	valuable:
forcing	function	for	progress
But	do	it	underneath	consistent	application	AP...
How	OpenJDK9	and	OpenJ9
fit	together
32
OpenJDK9	and	Eclipse	OpenJ9	projects
OpenJDK9
Hotspot
33
We	start	with	git mirror	of	OpenJDK9	w/o	
Hotspot
OpenJDK9
34
Some	integration	code	for	OpenJ9
OpenJDK9
HotSpot
• Not	much	integration	code	(4K	lines	compared	to	millions	in	OpenJDK)
•...
Build	together	using	OpenJDK makefiles
OpenJDK9
HotSpot
OpenJDK9
HotSpot For	more	details,	see:
https://www.eclipse.org/op...
https://adoptopenjdk.net/nightly.html?variant=openjdk9-openj9
37
Eclipse	OpenJ9	contains	Eclipse	OMR
OpenJDK9
HotSpot
OpenJDK9
HotSpot
Language	agnostic	technology	components	for:
Garbage...
Eclipse	OMR	can	be	shared	with	other	runtimes
OpenJDK9
HotSpot
OpenJDK9
HotSpot
Swift
Javascript
…
39
Brief
Performance
Comparison
40
Real	world	performance
https://github.com/WASdev/sample.daytrader3
41
Evaluate	with	4	conflicting	metrics
1. Start-up:	time	until	app	server	is	ready	to	accept	load
• Part	of	deployment	time,	...
43
Smaller	
is	better
0.0
0.2
0.4
0.6
0.8
1.0
1.2
OpenJDK9	with	HotSpot OpenJDK9	with	OpenJ9 OpenJDK9	with	OpenJ9	(-
Xshar...
Smaller	
is	better
44
0.0
0.2
0.4
0.6
0.8
1.0
1.2
OpenJDK9	with	HotSpot OpenJDK9	with	OpenJ9 OpenJDK9	with	OpenJ9	(-
Xshar...
45
Smaller	
is	better
0 200 400 600 800 1000 1200 1400 1600 1800
JVM	process	Resident	Set	Size
Time	(sec)
DayTrader3	Footp...
46
Higher	is	
better
0 200 400 600 800 1000 1200 1400 1600 1800
Throughput
Time	(sec)
DayTrader3	Throughput	Ramp-up
(all	r...
Daytrader3	Performance	Summary
• OpenJDK9	with	OpenJ9	using	–Xshareclasses (default	OpenLiberty options):
• Starts	35%	qui...
Licensing
Dual	license:	Apache	2.0	or	Eclipse	Public	License	2.0
EPLv2	has	secondary	license	compatibility
for	GPLv2	with	...
49
OpenJDK9
HotSpot
OpenJDK9
HotSpot
GPLv2	with
special	assembly
and	classpath
exceptions
GPLv2	with	
special	assembly	
an...
code	movement
50
OpenJDK9
HotSpot
OpenJDK9
HotSpot
GPLv2	with
special	assembly
and	classpath
exceptions
GPLv2	with	
specia...
Wrap-up:	Want	to	get	involved?
• Download	OpenJDK with	OpenJ9	and	try	it	out!
• https://adoptopenjdk.net/nightly.html?vari...
Learn	more	at	Java	One!
• Deeper	dive	into	how	OpenJ9	works	with	Dan	Heidinga
OpenJ9:	Under	the	Hood	of	the	Next	Open	Sour...
Questions?
53
Mark	Stoodley
mstoodle@ca.ibm.com
@mstoodle
Legal	Notice
IBM	and	the	IBM	logo	are	trademarks	or	registered	trademarks	of	IBM	Corporation,	in	the	United	States,	other	...
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JavaOne 2017 - Mark Stoodley - Open Sourcing IBM J9 JVM

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Mark Stoodley's JavaOne session from 2017 on the latest open source JVM in the Java ecosystem: Eclipse OpenJ9, which comes from the IBM J9 JVM. Learn why IBM created the project, how this JVM works with OpenJDK, how your Java application can start 35% faster and use 2X less footprint, how OpenJ9 is licensed, and how you can get involved!

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JavaOne 2017 - Mark Stoodley - Open Sourcing IBM J9 JVM

  1. 1. Open Sourcing the IBM J9 Java Virtual Machine Mark Stoodley an Eclipse OpenJ9 Project Lead an Eclipse OMR Project Lead Steve Wallin Program Director IBM Runtime Technologies
  2. 2. Important disclaimers • THE INFORMATION CONTAINED IN THIS PRESENTATION IS PROVIDED FOR INFORMATIONAL PURPOSES ONLY. • WHILST EFFORTS WERE MADE TO VERIFY THE COMPLETENESS AND ACCURACY OF THE INFORMATION CONTAINED IN THIS PRESENTATION, IT IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. • ALL PERFORMANCE DATA INCLUDED IN THIS PRESENTATION HAVE BEEN GATHERED IN A CONTROLLED ENVIRONMENT. YOUR OWN TEST RESULTS MAY VARY BASED ON HARDWARE, SOFTWARE OR INFRASTRUCTURE DIFFERENCES. • ALL DATA INCLUDED IN THIS PRESENTATION ARE MEANT TO BE USED ONLY AS A GUIDE. • IN ADDITION, THE INFORMATION CONTAINED IN THIS PRESENTATION IS BASED ON IBM’S CURRENT PRODUCT PLANS AND STRATEGY, WHICH ARE SUBJECT TO CHANGE BY IBM, WITHOUT NOTICE. • IBM AND ITS AFFILIATED COMPANIES SHALL NOT BE RESPONSIBLE FOR ANY DAMAGES ARISING OUT OF THE USE OF, OR OTHERWISE RELATED TO, THIS PRESENTATION OR ANY OTHER DOCUMENTATION. • NOTHING CONTAINED IN THIS PRESENTATION IS INTENDED TO, OR SHALL HAVE THE EFFECT OF: • CREATING ANY WARRANT OR REPRESENTATION FROM IBM, ITS AFFILIATED COMPANIES OR ITS OR THEIR SUPPLIERS AND/OR LICENSORS 2 2
  3. 3. J9 JVM Open source projects at Eclipse Foundation 2016/2017 and on Closed source development at IBM 1997 – 2016/2017 OMR IBM J9 JVM is now two open source projects! OpenJ9 consumes OMR March 2016 Sep 2017
  4. 4. This presentation: • Why open source the J9 JVM? • How do OpenJDK and OpenJ9 fit together? • Performance of OpenJDK with OpenJ9 • License • How can you learn more / get involved 4
  5. 5. Why open source the J9 JVM? 5
  6. 6. J9 JVM a central hub for innovation within IBM 6 Cognitive Analytics Cloud Business Insights Application Platform Microsoft® Windows® J9 JVMConsistent Java Platform Experience Platform feature exploitation
  7. 7. Over the last 20 years… Developer mindset has changed dramatically Developers are choosing to use open source And our employers are letting / encouraging us do it!! 7
  8. 8. Impact to J9 JVM as hub for innovation? 8 Cognitive Analytics Business Insights Application Platform Microsoft® Windows® J9 JVMConsistent Java Platform Experience Platform feature exploitation Cloud
  9. 9. Proprietary J9 JVM cannot reach developers! 9 Cognitive Analytics Cloud Business Insights App Platform Microsoft® Windows® J9 JVMConsistent Java Platform Experience Exploit platform features X
  10. 10. All the innovation we have been pouring into J9 JVM cannot reach the developers we built it for Boo! L 10
  11. 11. Wait, what innovation? 11
  12. 12. Adaptive compilation (6 levels) since 1999 (you probably know it as “tiered compilation”) 12
  13. 13. Escape analysis and stack allocation since 2001 13
  14. 14. Class sharing (even for application classes) since 2005 14
  15. 15. Metronome soft real-time GC policy (GC pauses as low as 1ms) since 2006 15
  16. 16. Application phase detection feeding compilation heuristics since 2006 16
  17. 17. Dynamic Ahead of Time (AOT) compiled code since 2007 17
  18. 18. Compressed references since 2007 18
  19. 19. Idle time optimizations since 2007 19
  20. 20. Balanced (region-based) GC since 2011 20
  21. 21. Hardware Transactional Memory support in our JIT compiler since 2013 21
  22. 22. Auto SIMD (vector) and Auto GPU in our JIT compiler since 2014 22
  23. 23. Eclipse OMR Sharing runtime technology with other languages Proof of concept ports for Swift, Lua, Ruby, Smalltalk, Rosie pattern language, Javascript Since 2016 23
  24. 24. Pause-less GC support on latest z14 processors 2017 24
  25. 25. Everything I just showed operates in production in IBM J9 25
  26. 26. Everything I just showed operates in production in IBM J9 and has now been open sourced as Eclipse OpenJ9 and Eclipse OMR! 26
  27. 27. J9 JVM Open source projects at Eclipse Foundation 2016/2017 and on Closed source development at IBM 1997 – 2016/2017 1.5MLOC 800KLOC OMR IBM J9 JVM is now two open source projects! OpenJ9 consumes OMR March 2016 Sep 2017
  28. 28. 3 releases shipped from open source branches 28 Dec 2013 J9 “R27” (Java 7 JCL) J9 master branch Feb 2015 J9 “R28” (Java 8 JCL) Mar 2016 Sep 1 2017 J9 “R29” (Java 8 JCL) Sep 15 2017 Sep 13 2017 IBM J9 development branches evolved to open source development branches
  29. 29. https://www.eclipse.org/openj9 29 https://github.com/eclipse/openj9
  30. 30. But do we need another open source JVM? 30
  31. 31. Yes! JVM competition is healthy and valuable: forcing function for progress But do it underneath consistent application API (i.e. Java Class Libraries) 31
  32. 32. How OpenJDK9 and OpenJ9 fit together 32
  33. 33. OpenJDK9 and Eclipse OpenJ9 projects OpenJDK9 Hotspot 33
  34. 34. We start with git mirror of OpenJDK9 w/o Hotspot OpenJDK9 34
  35. 35. Some integration code for OpenJ9 OpenJDK9 HotSpot • Not much integration code (4K lines compared to millions in OpenJDK) • Makefiles, configuration, some JCL, other stuff • Not really where the innovation happens • Plan to keep as minimal as possible 35
  36. 36. Build together using OpenJDK makefiles OpenJDK9 HotSpot OpenJDK9 HotSpot For more details, see: https://www.eclipse.org/openj9/oj9_build.html36
  37. 37. https://adoptopenjdk.net/nightly.html?variant=openjdk9-openj9 37
  38. 38. Eclipse OpenJ9 contains Eclipse OMR OpenJDK9 HotSpot OpenJDK9 HotSpot Language agnostic technology components for: Garbage Collection Just In Time Compiler Diagnostics Monitoring etc. 38
  39. 39. Eclipse OMR can be shared with other runtimes OpenJDK9 HotSpot OpenJDK9 HotSpot Swift Javascript … 39
  40. 40. Brief Performance Comparison 40
  41. 41. Real world performance https://github.com/WASdev/sample.daytrader3 41
  42. 42. Evaluate with 4 conflicting metrics 1. Start-up: time until app server is ready to accept load • Part of deployment time, restart time, productivity: compile-edit-debug cycle 2. Resident memory footprint after start-up, before load applied • In cloud, memory means $$, not all servers are immediately employed 3. Resident memory footprint every few seconds while load applied 30 minutes 4. Throughput performance every few seconds while load applied 30 minutes • Conflicting? • improving throughput usually increases footprint and/or start-up and vice versa 42
  43. 43. 43 Smaller is better 0.0 0.2 0.4 0.6 0.8 1.0 1.2 OpenJDK9 with HotSpot OpenJDK9 with OpenJ9 OpenJDK9 with OpenJ9 (- Xshareclasses -Xsc60m - Xscaotmax=8m) Normalized start-up time DayTrader3 Start-up Time (all runs with -Xmx1g) +6% -35% (default OpenLiberty options)
  44. 44. Smaller is better 44 0.0 0.2 0.4 0.6 0.8 1.0 1.2 OpenJDK9 with HotSpot OpenJDK9 with OpenJ9 OpenJDK9 with OpenJ9 (- Xshareclasses -Xsc60m - Xscaotmax=8m) Normalized JVM process Resident Set Size DayTrader3 Footprint after start-up (all runs with -Xmx1g) 2.6X better 2.6X better (default OpenLiberty options)
  45. 45. 45 Smaller is better 0 200 400 600 800 1000 1200 1400 1600 1800 JVM process Resident Set Size Time (sec) DayTrader3 Footprint Ramp-up (all runs with -Xmx1g) OpenJDK9 with HotSpot OpenJDK9 with OpenJ9 OpenJDK9 with OpenJ9 (-Xshareclasses -Xsc60m -Xscaotmax=8m) 1.8X smaller
  46. 46. 46 Higher is better 0 200 400 600 800 1000 1200 1400 1600 1800 Throughput Time (sec) DayTrader3 Throughput Ramp-up (all runs with -Xmx1g) OpenJDK9 with Hotspot OpenJDK9 with OpenJ9 OpenJDK9 with OpenJ9 (-Xshareclasses -Xsc60m -Xscaotmax=8m) Reaches peak 7 minutes earlier
  47. 47. Daytrader3 Performance Summary • OpenJDK9 with OpenJ9 using –Xshareclasses (default OpenLiberty options): • Starts 35% quicker • Consumes 2.6X less memory after start-up before applying load • Consumes 1.8X less memory after 30 minutes of load • Achieved comparable throughput performance 7 minutes earlier • Conclusion from this benchmark: • Half the cost running OpenJDK9 with OpenJ9, or twice the work for the same cost • Deploy and recover JVMs 35% faster using OpenJDK9 with OpenJ9 • For more details or to try it yourself, see: • https://github.com/eclipse/openj9-website/blob/master/benchmark/daytrader3.md47
  48. 48. Licensing Dual license: Apache 2.0 or Eclipse Public License 2.0 EPLv2 has secondary license compatibility for GPLv2 with Special Assembly and Classpath exceptions (OpenJDK license) 48
  49. 49. 49 OpenJDK9 HotSpot OpenJDK9 HotSpot GPLv2 with special assembly and classpath exceptions GPLv2 with special assembly and classpath exceptions (via EPLv2) Resulting binary is GPLv2 with special assembly and classpath exceptions 1. Supports building OpenJDK with OpenJ9 1
  50. 50. code movement 50 OpenJDK9 HotSpot OpenJDK9 HotSpot GPLv2 with special assembly and classpath exceptions GPLv2 with special assembly and classpath exceptions Resulting binary is GPLv2 with special assembly and classpath exceptions 2. Supports code exchange with Eclipse OMR 1 2 2 Eclipse OpenJ9 and Eclipse OMR have identical license allowing code exchange
  51. 51. Wrap-up: Want to get involved? • Download OpenJDK with OpenJ9 and try it out! • https://adoptopenjdk.net/nightly.html?variant=openjdk9-openj9 • Run on your favourite Java application and let us know how it went! • Interact with our community via Github issues • https://github.com/eclipse/openj9 • Ask questions, report problems, report Amazing Results • Download the code, build it yourself, play around! • Submit pull requests, see them tested on multiple platforms in the open • Whatever you think will make Eclipse OpenJ9 better, we’d love to hear it51
  52. 52. Learn more at Java One! • Deeper dive into how OpenJ9 works with Dan Heidinga OpenJ9: Under the Hood of the Next Open Source JVM [CON3573] Tuesday, Oct 03, 3:00 p.m. - 3:45 p.m. | Moscone West - Room 2004 • Have even more questions? Dan Heidinga, Mark Stoodley, John Duimovich Ask the OpenJ9 Architects [CON2672] Wednesday, Oct 04, 8:30 a.m. - 9:15 a.m. | Moscone West - Room 2011 • Learn about microservices for open testing with Shelley Lambert Cloud-Based Test Microservices [CON2789] Thursday, Oct 05, 11:45 a.m. - 12:30 p.m. | Marriott Marquis (Yerba Buena Level) - Salon 12 • Debugging runtimes with Dan Heidinga for Bjørn Vårdal Secrets of Building a Debuggable Runtime [CON4081] Thursday, Oct 05, 12:45 p.m. - 1:30 p.m. | Marriott Marquis (Yerba Buena Level) - Salon 15 • Visit the Eclipse Foundation booth (6140) Dan Heidinga and Mark Stoodley today from 4:00 - 5:45 Mark Stoodley on Wednesday from 2:30 - 4:30 52
  53. 53. Questions? 53 Mark Stoodley mstoodle@ca.ibm.com @mstoodle
  54. 54. Legal Notice IBM and the IBM logo are trademarks or registered trademarks of IBM Corporation, in the United States, other countries or both. Java and all Java-based marks, among others, are trademarks or registered trademarks of Oracle in the United States, other countries or both. Other company, product and service names may be trademarks or service marks of others. THE INFORMATION DISCUSSED IN THIS PRESENTATION IS PROVIDED FOR INFORMATIONAL PURPOSES ONLY. WHILE EFFORTS WERE MADE TO VERIFY THE COMPLETENESS AND ACCURACY OF THE INFORMATION, IT IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, AND IBM SHALL NOT BE RESPONSIBLE FOR ANY DAMAGES ARISING OUT OF THE USE OF, OR OTHERWISE RELATED TO, SUCH INFORMATION. ANY INFORMATION CONCERNING IBM'S PRODUCT PLANS OR STRATEGY IS SUBJECT TO CHANGE BY IBM WITHOUT NOTICE. 53

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