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https://issues.apache.org/jira/browse/LOG4J2-1359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15931936#comment-15931936
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Ralph Goers commented on LOG4J2-1359:
-------------------------------------
Here are the results of the benchmarks. Overall, it seems that most of the
tests are a bit slower in Java 9. Serializing an Event that has an Exception is
a LOT slower, which is probably a result of the performance regression I
already reported. However, getting the location information takes about 1/3 the
time it did in Java 7.
I don't understand the results of the serialization tests though. Although it
is understandable that building a log event without an exception would be much
faster than building one without one, I would have expected that building a
serialized log event with location information would be about the same as
building an event without location information + the time to get the location
information. Instead, in Java 9 it is showing as slightly faster than getting
the event without location information. I am thinking there must be something
wrong with the test.
Java 7
{code}
Benchmark
Mode Samples Score Error Units
o.a.l.l.p.j.Log4jLogEventBenchmark.createLogEventWithExceptionUsingBuilder
avgt 5 147.173 ± 3.876 ns/op
o.a.l.l.p.j.Log4jLogEventBenchmark.createLogEventWithoutException
avgt 5 177.807 ± 18.619 ns/op
o.a.l.l.p.j.Log4jLogEventBenchmark.createLogEventWithoutExceptionUsingBuilder
avgt 5 146.371 ± 9.554 ns/op
o.a.l.l.p.j.Log4jLogEventBenchmark.createSerializableLogEventProxyWithException
avgt 5 18450.541 ± 380.800 ns/op
o.a.l.l.p.j.Log4jLogEventBenchmark.createSerializableLogEventProxyWithoutException
avgt 5 250.715 ± 8.624 ns/op
o.a.l.l.p.j.Log4jLogEventBenchmark.createSerializableLogEventProxyWithoutExceptionWithLocation
avgt 5 274.293 ± 35.927 ns/op
o.a.l.l.p.j.Log4jLogEventBenchmark.getSourceLocationOfLogEvent
avgt 5 19988.446 ± 1752.194 ns/op
o.a.l.l.p.j.Log4jLogEventBenchmark.testBaseline
avgt 5 0.391 ± 0.028 ns/op
{code}
Java 9
{code}
Benchmark
Mode Samples Score Error Units
o.a.l.l.p.j.Log4jLogEventBenchmark.createLogEventWithExceptionUsingBuilder
avgt 5 190.018 ± 28.264 ns/op
o.a.l.l.p.j.Log4jLogEventBenchmark.createLogEventWithoutException
avgt 5 228.393 ± 16.702 ns/op
o.a.l.l.p.j.Log4jLogEventBenchmark.createLogEventWithoutExceptionUsingBuilder
avgt 5 171.760 ± 26.799 ns/op
o.a.l.l.p.j.Log4jLogEventBenchmark.createSerializableLogEventProxyWithException
avgt 5 32257.972 ± 4868.261 ns/op
o.a.l.l.p.j.Log4jLogEventBenchmark.createSerializableLogEventProxyWithoutException
avgt 5 285.204 ± 20.197 ns/op
o.a.l.l.p.j.Log4jLogEventBenchmark.createSerializableLogEventProxyWithoutExceptionWithLocation
avgt 5 271.399 ± 28.883 ns/op
o.a.l.l.p.j.Log4jLogEventBenchmark.getSourceLocationOfLogEvent
avgt 5 6839.420 ± 1007.405 ns/op
o.a.l.l.p.j.Log4jLogEventBenchmark.testBaseline
avgt 5 0.402 ± 0.009 ns/op
{code}
> Add support for Java 9 StackWalker API in ReflectionUtil
> --------------------------------------------------------
>
> Key: LOG4J2-1359
> URL: https://issues.apache.org/jira/browse/LOG4J2-1359
> Project: Log4j 2
> Issue Type: Improvement
> Components: API
> Environment: Java 1.9+
> Reporter: Matt Sicker
> Assignee: Ralph Goers
> Labels: jdk9
>
> [StackWalker|http://download.java.net/jdk9/docs/api/java/lang/StackWalker.html]
> Based on the functional nature of this API, supporting it may require
> compiling at least one class using javac 1.9 and reflectively loading it in
> ReflectionUtil similar to how Spring supports newer JDK APIs.
> Without support for StackWalker, ReflectionUtil will fall back to using a
> slower API in Java 1.9. This is because the Reflection class is a
> sun-internal class which are no longer exported to non-JDK code without
> setting special command line flags.
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