[#3925] - Thread Contention problems

The issue refer to post : http://jasperforge.org/plugins/espforum/view.php?group_id=102&forumid=10...

The following stack traces shows the contention problems when 100's of threads are used to generate the report. Currently in our application we are getting around 2500 reports per minutes ( in 3 servers - 8 core, 16 GB RAM each) but what I am looking for is to get around 10000 reports per minute :-) I know, I am looking for a figure which is achievable in the hardware where I am working on, but I need to remove the contentions completely.

The main problem I am having now is in init of LineBreakMeasurer, Since this is core of report printing, I am really stuck without any solution. I was wondering if any solution is possible to this contention? like maintaining a cache of LineBreakMeasurer with the key of font, size, style etc and then using deleteChar and insertChar of LineBreakMeasurer instance ? I am not sure if that itself will be synchronized !. If I do not get any solution to this, I may not have any solution to scale up ( even I could try Fork-Join in Java 7 ? I am not sure if the synchronization problem will go away with that ? : http://www.ibm.com/developerworks/java/library/j-jtp11137.html )

Another option could be like a much simpler algorithm for non styled text fields where majority of the reporting happens, and more complex solution like LineBreakMeasurer for really complex fonts ?? One link I saw was http://www.freshcookies.org/jtreemap/api/org/freshcookies/awt/LineWrappe... ( I am not sure if this is completely different topic altogether )

When I profiled, I got the first contention in net.sf.jasperreports.engine.util.JRProperties.getProperty(), where the Properties.get() is synchronized and so the below contention. For trial I have made the properties as ThreadLocal, but I think we can have better solution like ConcurrentHashMap or something like that to store the property values.

java.util.Properties.getProperty(java.lang.String)
net.sf.jasperreports.engine.util.JRProperties.getProperty(net.sf.jasperreports.engine.JRPropertiesHolder, java.lang.String)
net.sf.jasperreports.engine.util.JRTextMeasurerUtil.getTextMeasurerFactoryClass(net.sf.jasperreports.engine.JRPropertiesHolder)
net.sf.jasperreports.engine.util.JRTextMeasurerUtil.getTextMeasurerFactory(net.sf.jasperreports.engine.JRPropertiesHolder)
net.sf.jasperreports.engine.util.JRTextMeasurerUtil.createTextMeasurer(net.sf.jasperreports.engine.JRCommonText, net.sf.jasperreports.engine.JRPropertiesHolder)
net.sf.jasperreports.engine.util.JRTextMeasurerUtil.createTextMeasurer(net.sf.jasperreports.engine.JRCommonText)
net.sf.jasperreports.engine.fill.JRFillTextElement.createTextMeasurer()
net.sf.jasperreports.engine.fill.JRFillTextElement.ensureTextMeasurer()
net.sf.jasperreports.engine.fill.JRFillTextElement.chopTextElement(int)
net.sf.jasperreports.engine.fill.JRFillTextField.prepare(int, boolean)
net.sf.jasperreports.engine.fill.JRFillElementContainer.prepareElements(int, boolean)
net.sf.jasperreports.engine.fill.JRFillBand.fill(int, boolean)
net.sf.jasperreports.engine.fill.JRFillBand.fill(int)
net.sf.jasperreports.engine.fill.JRVerticalFiller.fillTitle()
net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportStart()
net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport()
net.sf.jasperreports.engine.fill.JRBaseFiller.fill(java.util.Map)
net.sf.jasperreports.engine.fill.JRBaseFiller.fill(java.util.Map, java.sql.Connection)
net.sf.jasperreports.engine.fill.JRFiller.fillReport(net.sf.jasperreports.engine.JasperReport, java.util.Map, java.sql.Connection)
net.sf.jasperreports.engine.JasperFillManager.fillReport(net.sf.jasperreports.engine.JasperReport, java.util.Map, java.sql.Connection)
net.sf.jasperreports.engine.JasperFillManager.fillReport(java.lang.String, java.util.Map, java.sql.Connection)

In the below case, the getRegistries() is synchronized on registryCache ( org.apache.commons.collections.ReferenceMap ) We could use something like http://www.nabble.com/ConcurrentReferenceMap-enhancement-to-166---Feedba... or some other implementation which will avoid the locking.

net.sf.jasperreports.extensions.DefaultExtensionsRegistry.getRegistries()
net.sf.jasperreports.extensions.DefaultExtensionsRegistry.getExtensions(Class)
net.sf.jasperreports.engine.util.JRFontUtil.getFontInfo(String, Locale)
net.sf.jasperreports.engine.util.JRFontUtil.getAwtFontFromBundles(String, int, int, Locale)
net.sf.jasperreports.engine.util.JRFontUtil.getAttributes(Map, JRFont, Locale)
net.sf.jasperreports.engine.JRStyledTextAttributeSelector$2.getStyledTextAttributes(JRPrintText)
net.sf.jasperreports.engine.fill.JRTemplatePrintText.getStyledText(JRStyledTextAttributeSelector)
net.sf.jasperreports.engine.JRAbstractExporter.getStyledText(JRPrintText, boolean)
net.sf.jasperreports.engine.export.JRPdfExporter.exportText(JRPrintText)
net.sf.jasperreports.engine.export.JRPdfExporter.exportElements(Collection)
net.sf.jasperreports.engine.export.JRPdfExporter.exportPage(JRPrintPage)
net.sf.jasperreports.engine.export.JRPdfExporter.exportReportToStream(OutputStream)
net.sf.jasperreports.engine.export.JRPdfExporter.exportReport()
net.sf.jasperreports.engine.JasperExportManager.exportReportToPdfStream(JasperPrint, OutputStream)

The following trace the contention is happening while ThreadLocal.get() call. I have not done any research in this area, but I just put a static ConcurentHashMap to put the registry and to get the value.

net.sf.jasperreports.extensions.ExtensionsEnvironment.getExtensionsRegistry()
net.sf.jasperreports.engine.util.JRFontUtil.getFontInfo(java.lang.String, java.util.Locale)
net.sf.jasperreports.engine.util.JRFontUtil.getAwtFontFromBundles(java.lang.String, int, int, java.util.Locale)
net.sf.jasperreports.engine.util.JRFontUtil.getAttributes(java.util.Map, net.sf.jasperreports.engine.JRFont, java.util.Locale)
net.sf.jasperreports.engine.JRStyledTextAttributeSelector$2.getStyledTextAttributes(net.sf.jasperreports.engine.JRPrintText)
net.sf.jasperreports.engine.fill.JRTemplatePrintText.getStyledText(net.sf.jasperreports.engine.JRStyledTextAttributeSelector)
net.sf.jasperreports.engine.JRAbstractExporter.getStyledText(net.sf.jasperreports.engine.JRPrintText, boolean)
net.sf.jasperreports.engine.export.JRPdfExporter.exportText(net.sf.jasperreports.engine.JRPrintText)
net.sf.jasperreports.engine.export.JRPdfExporter.exportElements(java.util.Collection)
net.sf.jasperreports.engine.export.JRPdfExporter.exportPage(net.sf.jasperreports.engine.JRPrintPage)
net.sf.jasperreports.engine.export.JRPdfExporter.exportReportToStream(java.io.OutputStream)
net.sf.jasperreports.engine.export.JRPdfExporter.exportReport()
net.sf.jasperreports.engine.JasperExportManager.exportReportToPdfStream(net.sf.jasperreports.engine.JasperPrint, java.io.OutputStream)