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Bug 1056214

Summary:	EJB invocation performance issues due to high allocation counts of useless strings
Product:	[JBoss] JBoss Enterprise Application Platform 6	Reporter:	David M. Lloyd <david.lloyd>
Component:	EJB	Assignee:	David M. Lloyd <david.lloyd>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Jan Martiska <jmartisk>
Severity:	medium	Docs Contact:	Russell Dickenson <rdickens>
Priority:	medium
Version:	6.1.1, 6.2.0, 6.2.1	CC:	kkhan, sgilda, smumford, wreicher
Target Milestone:	DR0
Target Release:	EAP 6.3.0
Hardware:	All
OS:	All
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A performance issue has been addressed in this release of JBoss EAP 6. The issue was caused by `StatefulComponentInstanceInterceptor` which performed a small concatenation in a debug log statement for every invocation. The subsequent extra allocations could cause increased Garbage Collection activity during stateful EJB invocation, leading to higher per-invocation processing overhead. This release of the product has incorporated an upstream patch which resolves this issue and per-invocation overhead is substantially decreased.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-06-28 15:25:19 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description David M. Lloyd 2014-01-21 17:14:30 UTC

Description of problem:

Due to a minor bug in the StatefulComponentInstanceInterceptor, a string concatenation is performed for every invocation which causes a substantial amount of GC churn.  The fix is simple and low-risk and has been thoroughly tested upstream.


Version-Release number of selected component (if applicable):

All versions.

How reproducible:

100%

Steps to Reproduce:
1. Process lots of invocations in a tight loop
2. Observe high allocation counts and GC activity
3. ~ fin ~

Actual results:

Useless string construction

Expected results:

No string construction unless log level is set to DEBUG or higher

Additional info:

The upstream version of this fix is here: https://github.com/wildfly/wildfly/commit/a6727c715a9d04c6991

Comment 2 Kabir Khan 2014-01-21 23:09:33 UTC

qa-acked myself since I wanted to clear out as many as possible before going to bed, and the fix is trivial

Comment 3 Jan Martiska 2014-02-17 10:59:03 UTC

Verified in 6.3.0.DR0.

Comment 4 sgilda 2014-05-12 19:35:56 UTC

Changed <literal></literal> tags in Doc Text to ticks (`) to fix Bug 1096865