Reduce memory usage for Velocity templates

• Key: VELOCITY-450
• Type: Wish
• Status: Resolved
• Resolution: Fixed
• Priority: Major
• Assignee: Unassigned
• Reporter: coumaravel
• Component/s: Engine
• Affects Version/s: 1.4
• Fix Version/s: 1.6

Description

Hi,

We are using the velocity templates extensively to
generate HTML reports. Normally our templates size on
the Disk is around 20-50kb, when it gets loaded into
Application(Tomcat) memory it turns to 3-5MB.

As of now we have 500 templates, in near future we are
planning to increase this to 1500.

Any Idea why this is happening. Any help in this is
much appreciated, as this is becoming a bottleneck for
the scalability of our application.

Thanks in advance.

Regards,
Coumar

Comments

[Nathan Bubna]

Hi Coumar,

I've recently been talking about ways to reduce memory usage with someone else on the user list. I've add the highlights of that conversation to the VelocityFAQ:

See http://wiki.apache.org/jakarta-velocity/VelocityFAQ

If you have further questions about it, feel free to ask on the [e-mail] list.

peace,
nathan

[Henning Schmiedehausen]

Memory usage is an issue that moves higher and higher on the prio list for 1.6. Retargetting the bug report there.

[tomcat]

Hello,

Are there any updates regarding issue?

There seems to be almost no development activity in Velocity community.

Hi,

I fixed something in https://issues.apache.org/jira/browse/VELOCITY-570. But I don't know if this helps for your problem.
So there is development activity.

Can you generate and analyze memory dumps of your problem? It is very nice to know what classes are holding what objects which use the memory.

Ronald.

[Nathan Bubna]

I'm guessing this has largely been dealt with via a number of different changes since 1.5. Does anyone still see this as a problem?