Flexible Magnolia Hosting in the Cloud

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By pooling JVM memory across virtual machines it's possible to operate flexible Magnolia CMS instances and overcome typical Java issues like out-of-memory events or resource over-provisioning. Being experienced in providing IaaS, we can show you real-world examples of how we do it and what benefits can be achieved by hosting Magnolia CMS in a VMware vCloud™ Powered environment.

Tecnología Empresariales

Flexible Magnolia Hosting
in the Cloud

Mathias Seiler

About us

☁ VMware vCloud™ Powered Service Provider
☁ Hosting hundreds of Magnolia CMS instances
☁ (Hosting Magnolia’s server infrastructure too)

www.mirocloud.com

Cloud starts today. With us.
http://www.mirocloud.com/

A few words on Java

☁ Fast and scalable
☁ Stable
☁ But ... Eats memory for breakfast

www.mirocloud.com

A few words on Java

☁ Start with 256M RAM at least (!)
☁ For STK: 512M or more
☁ (btw: not taking Derby into account)

www.mirocloud.com

How to scale?

☁ Throw hardware at the problem?
☁ Try to optimize memory allocations?
☁ Magic?

www.mirocloud.com

About Memory

☁ How is JVM memory “seen”
by the OS (kernel) ?

www.mirocloud.com

About Memory
☁ Like a big chunk of memory assigned to a
process.
☁ Kernel won’t manage it (except if swapping!)
☁ No visibility
☁ Extremely painful if it’s virtual memory
(on a hypervisor, set full reservations)

www.mirocloud.com

Quick poll

☁ Who’s using VMware (vSphere) ?
☁ Hyper-V ?
☁ Xen ?
☁ KVM?
☁ Any other virtualization technology?

www.mirocloud.com

EM4J

☁ Part of VMware vFabric
☁ Elastic Memory for Java
☁ Java Heap Memory Pooling

www.mirocloud.com

Pooling memory?
Memory Pool

www.mirocloud.com

How does it work?

☁ Ballooning
☁ Coordination with the Hypervisor

www.mirocloud.com

How does it work?
OS

Balloon

www.mirocloud.com

How does it work?
OS
JVM

Balloon

www.mirocloud.com

How does it work?

☁ Balance memory between VMs and hosts*

(*taking VMware’s Distributed Resource
Scheduler into account)

www.mirocloud.com

How does it work?
OS OS OS
JVM JVM JVM

Balloon
Balloon
Balloon

www.mirocloud.com

How does it work?
Magnolia ...
Balloon.jar
vFabric tc
OS
ESXi

www.mirocloud.com

Why?

☁ Less memory = less cost/power/licenses ...
☁ (but the most interesting ...)
☁ It’s elastic!

www.mirocloud.com

What does this mean?

☁ You can run applications ...
☁ ... more dynamically
☁ ... with less or no OOM events at all
☁ ... without over-allocating memory

www.mirocloud.com

What does this mean?

☁ In fact:
☁ We even allocate more memory
than before!
☁ Because that allocation is
the maximum memory the JVM
is going to consume.

www.mirocloud.com

Numbers

☁ You can save up to 40% of system memory
(at least that’s what we measured)
☁ Even if you allocate
more than you did before

www.mirocloud.com

“Elastic”

☁ real dynamic workload distribution
(“cloud”)
☁ traffic / workload “spikes” flattened out
☁ easy configuration

www.mirocloud.com

Interesting notes

☁ It’s adaptive by design
☁ = very little performance impact
☁ more “busy” JVMs get more
memory over time

www.mirocloud.com

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Flexible Magnolia Hosting in the Cloud

1. Flexible Magnolia Hosting in the Cloud Mathias Seiler

2. About us ☁ VMware vCloud™ Powered Service Provider ☁ Hosting hundreds of Magnolia CMS instances ☁ (Hosting Magnolia’s server infrastructure too) www.mirocloud.com

3. Cloud starts today. With us. http://www.mirocloud.com/

4. A few words on Java ☁ Fast and scalable ☁ Stable ☁ But ... Eats memory for breakfast www.mirocloud.com

5. A few words on Java ☁ Start with 256M RAM at least (!) ☁ For STK: 512M or more ☁ (btw: not taking Derby into account) www.mirocloud.com

6. How to scale? ☁ Throw hardware at the problem? ☁ Try to optimize memory allocations? ☁ Magic? www.mirocloud.com

7. Do something crazy! www.mirocloud.com

8. But before that ...

9. About Memory ☁ How is JVM memory “seen” by the OS (kernel) ? www.mirocloud.com

10. About Memory ☁ Like a big chunk of memory assigned to a process. ☁ Kernel won’t manage it (except if swapping!) ☁ No visibility ☁ Extremely painful if it’s virtual memory (on a hypervisor, set full reservations) www.mirocloud.com

11. Quick poll ☁ Who’s using VMware (vSphere) ? ☁ Hyper-V ? ☁ Xen ? ☁ KVM? ☁ Any other virtualization technology? www.mirocloud.com

12. EM4J ☁ Part of VMware vFabric ☁ Elastic Memory for Java ☁ Java Heap Memory Pooling www.mirocloud.com

13. Pooling memory? Memory Pool www.mirocloud.com

14. How does it work? ☁ Ballooning ☁ Coordination with the Hypervisor www.mirocloud.com

15. How does it work? OS Balloon www.mirocloud.com

16. How does it work? OS JVM Balloon www.mirocloud.com

17. How does it work? OS JVM Balloon www.mirocloud.com

18. How does it work? ☁ Balance memory between VMs and hosts* (*taking VMware’s Distributed Resource Scheduler into account) www.mirocloud.com

19. How does it work? OS OS OS JVM JVM JVM Balloon Balloon Balloon www.mirocloud.com

20. How does it work? Magnolia ... Balloon.jar vFabric tc OS ESXi www.mirocloud.com

21. Why? ☁ Less memory = less cost/power/licenses ... ☁ (but the most interesting ...) ☁ It’s elastic! www.mirocloud.com

22. What does this mean? ☁ You can run applications ... ☁ ... more dynamically ☁ ... with less or no OOM events at all ☁ ... without over-allocating memory www.mirocloud.com

23. What does this mean? ☁ In fact: ☁ We even allocate more memory than before! ☁ Because that allocation is the maximum memory the JVM is going to consume. www.mirocloud.com

24. Numbers ☁ You can save up to 40% of system memory (at least that’s what we measured) ☁ Even if you allocate more than you did before www.mirocloud.com

25. “Elastic” ☁ real dynamic workload distribution (“cloud”) ☁ traffic / workload “spikes” flattened out ☁ easy configuration www.mirocloud.com

26. Interesting notes ☁ It’s adaptive by design ☁ = very little performance impact ☁ more “busy” JVMs get more memory over time www.mirocloud.com

27. Questions? www.mirocloud.com

Flexible Magnolia Hosting in the Cloud

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