Details
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Type:
Improvement
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Status:
Closed
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Priority:
Blocker
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Resolution: Fixed
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Affects Version/s: 1.6, 1.6.1, 1.5.8, 1.6.2, 1.6.3
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Fix Version/s: 1.9-beta-4, 1.8.4
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Component/s: None
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Labels:None
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Environment:Linux, Java 1.6, Tomcat
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Number of attachments :
Description
Sscalability seems to suffer as a result of TagLibs being implemented as singletons and locking occurring on ExpandoMetaClass.isModified() when the server is processing multiple requests concurrently.
Performance is fine when there is a small number of concurrent requests, but as the number of concurrent requests increases response times increase dramatically.
Locking was noticed by profiling a running application using Your Kit Java Profiler and JMeter to simulate load.
More details are available here:
http://digitalmorphosis.blogspot.com/2009/05/grails-scalability.html
Obvious fix would be to create new instances of taglibs for each request/thread, but not sure what side effects this would have?
