[JBoss JIRA] (LOGMGR-157) Provide faster alternative to SimpleDataFormat
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[
https://issues.jboss.org/browse/LOGMGR-157?page=com.atlassian.jira.plugin...
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James Perkins commented on LOGMGR-157:
--------------------------------------
So I finally did some testing today and didn't really notice much of a difference.
{code:title=SimpleDateFormat}
Benchmark Mode Cnt Score Error Units
PatternFormatterBenchmark.noCause avgt 200 835.709 ± 12.675 ns/op
{code}
{code:title=ISO8601DateFormat}
Benchmark Mode Cnt Score Error Units
PatternFormatterBenchmark.noCause avgt 200 790.064 ± 5.355 ns/op
{code}
{code:title=DateTimeFormatter}
Benchmark Mode Cnt Score Error Units
PatternFormatterBenchmark.noCause avgt 200 873.482 ± 12.207 ns/op
{code}
The {{ISO8601DateFormat}} does appear to be a little faster, but IMO not significant
enough to invest in the time of writing our own date formatter. FWIW the
{{ISO8601DateFormat}} also has to use a {{ThreadLocal}} because it uses a
{{java.util.Calendar}} internally.
It is possible though that using the new {{DateTimeFormatter}} makes sense as it
wouldn't require a {{ThreadLocal}} so it would likely produce less garbage.
Provide faster alternative to SimpleDataFormat
----------------------------------------------
Key: LOGMGR-157
URL: https://issues.jboss.org/browse/LOGMGR-157
Project: JBoss Log Manager
Issue Type: Enhancement
Components: core
Affects Versions: 2.0.6.Final
Reporter: Koen Janssens
Attachments: DateFormatPerformance.java
Whenever a data or timestamp is included in the logging pattern, SimpleDataFormat is used
for formatting. Even with one instance per thread, it is still a heavy beast.
Other logging libraries (like the 15 year old log4j) have 'fast tracks' for known
formats such as ISO 8601. These implementations are faster and generate less memory
garbage.
During profiling, i discovered that simpledateformat is doing a lot of stuff while
printing a date:
at java.lang.Thread.run(Thread.java:748)
at org.jboss.logmanager.handlers.AsyncHandler$AsyncTask.run(AsyncHandler.java:196)
at org.jboss.logmanager.ExtHandler.publish(ExtHandler.java:76)
at org.jboss.logmanager.handlers.WriterHandler.doPublish(WriterHandler.java:46)
at org.jboss.logmanager.ExtFormatter.format(ExtFormatter.java:32)
at
org.jboss.logmanager.formatters.MultistepFormatter.format(MultistepFormatter.java:83)
at
org.jboss.logmanager.formatters.Formatters$JustifyingFormatStep.render(Formatters.java:224)
at org.jboss.logmanager.formatters.Formatters$5.renderRaw(Formatters.java:389)
at java.text.DateFormat.format(DateFormat.java:345)
at java.text.SimpleDateFormat.format(SimpleDateFormat.java:936)
at java.text.SimpleDateFormat.format(SimpleDateFormat.java:966)
at java.text.SimpleDateFormat.subFormat(SimpleDateFormat.java:1125)
at java.util.Calendar.getDisplayName(Calendar.java:2110)
at java.text.DateFormatSymbols.getInstance(DateFormatSymbols.java:340)
at java.text.DateFormatSymbols.getProviderInstance(DateFormatSymbols.java:364)
at
sun.util.locale.provider.DateFormatSymbolsProviderImpl.getInstance(DateFormatSymbolsProviderImpl.java:85)
at java.text.DateFormatSymbols.<init>(DateFormatSymbols.java:145)
at java.text.DateFormatSymbols.initializeData(DateFormatSymbols.java:710)
at sun.util.resources.LocaleData.getDateFormatData(LocaleData.java:127)
at sun.util.resources.LocaleData.getBundle(LocaleData.java:163)
at java.security.AccessController.doPrivileged(Native Method)
at sun.util.resources.LocaleData$1.run(LocaleData.java:163)
at sun.util.resources.LocaleData$1.run(LocaleData.java:167)
at java.util.ResourceBundle.getBundle(ResourceBundle.java:890)
at java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1348)
at java.util.ResourceBundle.checkList(ResourceBundle.java:1400)
at java.util.Collections$UnmodifiableCollection.isEmpty(Collections.java:1031)
at java.util.AbstractCollection.isEmpty(AbstractCollection.java:86)
I have attached a small comparision between simpledateformat performance and log4j ISO
formatting performance. It roughly a factor 10 'faster'
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James Perkins (JIRA)