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Bug 324350

Summary:	Reports run slow the first time after application server is restarted
Product:	z_Archived	Reporter:	vivek <vivextra>
Component:	BIRT	Assignee:	Birt-ReportEngine-inbox <Birt-ReportEngine-inbox>
Status:	CLOSED INVALID	QA Contact:	Xiaoying Gu <bluesoldier>
Severity:	major
Priority:	P3	CC:	bluesoldier, jouyang
Version:	2.6.0
Target Milestone:	3.7.0
Hardware:	All
OS:	Linux
Whiteboard:	Obsolete

Description vivek

2010-09-02 16:11:49 EDT

Build Identifier: Birt 2.6

After upgrading our reports from Birt 2.3.0 to 2.6 we noticed that most of our reports are running slow after the application was started, but the subsequent runs are faster. I'm not sure if this is some new thing since 2.3 - like caching or configuration.

After discussion with Jason on forum (http://www.birt-exchange.org/org/forum/index.php/topic/20400-performance-degradation-when-upgrading-from-birt-2-3-to-2-6/) he suggested the following,

"The first time BIRT runs a report it is always slower as the engine has to crank up OSGi. ... you can open a bug entry to possibly prestart the engine."

I've seen this issue mostly with reports that are dynamically generated, i.e, the whole table, header generated at run-time using the APIs.

Reproducible: Always

Comment 1 Jun Ouyang

2010-11-02 02:11:06 EDT

It's expected behavior because many resources are loaded lazily when first time a reports get run.