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Posted to commits@logging.apache.org by rg...@apache.org on 2016/04/26 06:31:27 UTC
[31/34] logging-log4j2 git commit: LOG4J2-1297 added initial
performance test results: synchronous logging throughput
LOG4J2-1297 added initial performance test results: synchronous logging throughput
Project: http://git-wip-us.apache.org/repos/asf/logging-log4j2/repo
Commit: http://git-wip-us.apache.org/repos/asf/logging-log4j2/commit/7730ae5e
Tree: http://git-wip-us.apache.org/repos/asf/logging-log4j2/tree/7730ae5e
Diff: http://git-wip-us.apache.org/repos/asf/logging-log4j2/diff/7730ae5e
Branch: refs/heads/LOG4j2-494
Commit: 7730ae5eed9b7296e38b9d60578365d2cae9e39b
Parents: f226b97
Author: rpopma <rp...@apache.org>
Authored: Mon Apr 25 23:44:10 2016 +0900
Committer: Ralph Goers <rg...@nextiva.com>
Committed: Mon Apr 25 21:30:30 2016 -0700
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.../garbage-free2.6-SyncThroughputLinux.png | Bin 0 -> 70039 bytes
src/site/xdoc/manual/garbagefree.xml | 30 +++++++++++++++----
2 files changed, 25 insertions(+), 5 deletions(-)
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http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/7730ae5e/src/site/resources/images/garbage-free2.6-SyncThroughputLinux.png
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diff --git a/src/site/resources/images/garbage-free2.6-SyncThroughputLinux.png b/src/site/resources/images/garbage-free2.6-SyncThroughputLinux.png
new file mode 100644
index 0000000..5de5d9f
Binary files /dev/null and b/src/site/resources/images/garbage-free2.6-SyncThroughputLinux.png differ
http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/7730ae5e/src/site/xdoc/manual/garbagefree.xml
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diff --git a/src/site/xdoc/manual/garbagefree.xml b/src/site/xdoc/manual/garbagefree.xml
index 66cd532..c9e8692 100644
--- a/src/site/xdoc/manual/garbagefree.xml
+++ b/src/site/xdoc/manual/garbagefree.xml
@@ -352,12 +352,32 @@ public void garbageFree() {
</subsection>
<a name="Performance" />
<subsection name="Performance">
-
<a name="Latency" />
- <h4>TBD what to include here</h4>
- <p>Async Loggers 2.5 vs 2.6 in garbage-free mode</p>
- <p>Log4j 2.6 synchronous logging "classic" versus garbage-free mode - impact of adding threads</p>
- <p>Comparison with other logging libraries?</p>
+ <h4>Response Time of Garbage-free Logging is Consistently Better with Fewer Spikes</h4>
+ <p>TODO: add latency histogram: Response time distribution of Async Loggers 2.5 vs 2.6 in garbage-free mode under various loads.</p>
+ <p>TODO: add latency histogram: Response time distribution of synchronous logging vs 2.6 in garbage-free mode under various loads.</p>
+
+ <a name="Throughput" />
+ <h4>Throughput of Garbage-free Logging May Be Worse (But It's All Relative)</h4>
+ <p>Log4j 2.6 in garbage-free mode has the highest throughput in single-threaded scenarios. In multi-threaded
+ scenarios, Log4j 2.6 "classic" has highest throughput, with Log4j 2.6 in garbage-free mode and Log4j 2.5
+ not far behind. Our test results suggest that the throughput of all other logging frameworks rapidly
+ declines in multi-threaded applications.</p>
+ <p>The graph below compares Log4j 2.6 in garbage-free mode to Log4j 2.6 "classic" mode (which allocates
+ temporary objects for every logging call), Log4j 2.5, Log4j 1.2.17, Logback 1.1.7 and
+ Java util logging (JUL) on Oracle Java 1.8.0_45. All Log4j 2.x results use the RandomAccessFile appender.
+ Log4j 1.2.17, Logback and JUL use their respective File appenders. ImmediateFlush was set to <tt>false</tt> for all
+ loggers that support this. The JUL results are for the <tt>XMLFormatter</tt> (which in our measurements was
+ about twice as fast as the <tt>SimpleFormatter</tt>).</p>
+ <p>The synchronous logging throughput results below are generated with the
+ <a href="http://openjdk.java.net/projects/code-tools/jmh/">JMH</a> Java benchmark harness.
+ See the <tt>org.apache.logging.log4j.perf.jmh.FileAppenderBenchmark</tt> source code in the log4j-perf module.</p>
+ <p><img src="../images/garbage-free2.6-SyncThroughputLinux.png"
+ alt="Throughput of Log4j 2.6 in garbage-free mode is slightly worse than in classic mode, but on par with 2.5 and much better than alternatives logging libraries" /></p>
+ <p>(TODO: DOUBLE-CHECK) The above results are for <em>synchronous</em> logging. For <em>asynchronous</em> logging,
+ there was no measurable difference in throughput between
+ Log4j 2.6 in garbage-free mode and Log4j 2.6 in "classic" mode (allocating
+ new objects on every logging call).</p>
</subsection>
<a name="UnderTheHood" />
<subsection name="Under the Hood">