[ http://jira.qos.ch/browse/LBCLASSIC-36?page=com.atlassian.jira.plugin.system... ] Joern Huxhorn updated LBCLASSIC-36: ----------------------------------- Attachment: DoubleCheckedLocking.patch === DateFormatting === java.runtime.version = 1.6.0_13-b03-211 java.vendor = Apple Inc. java.version = 1.6.0_13 os.name = Mac OS X os.version = 10.5.7 JODA: total of 52011401 operations, or 17337 operations per millisecond SDF: total of 52664135 operations, or 17554 operations per millisecond I've removed the double-checked locking from the example app. http://www.cs.umd.edu/~pugh/java/memoryModel/jsr-133-faq.html How are you executing this app? I started it from within IDEA but I fear that this influences the outcome...
Synchronization of SimpleDateFormat object in DateConverter -----------------------------------------------------------
Key: LBCLASSIC-36 URL: http://jira.qos.ch/browse/LBCLASSIC-36 Project: logback-classic Issue Type: Bug Components: Other Affects Versions: unspecified Environment: Operating System: All Platform: All Reporter: Anders Hammar Assignee: Ceki Gulcu Attachments: DateConverter_patch.java, DateFormatPerfTest.java, dateformattest.zip, DoubleCheckedLocking.patch
According to the API documentation of SimpleDateFormat, date formats are not synchronized and it is recommended to create separate format instances for each thread. However, a possibly simpler (mer efficient) solution would be to synchronize on the SimpleDateFormat object in the convert() method to prevent two threads to access it concurrently.
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