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https://issues.apache.org/jira/browse/LOG4J2-1179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15267795#comment-15267795
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Remko Popma commented on LOG4J2-1179:
-------------------------------------
added Gelf to the list.
> Log4j performance documentation
> -------------------------------
>
> Key: LOG4J2-1179
> URL: https://issues.apache.org/jira/browse/LOG4J2-1179
> Project: Log4j 2
> Issue Type: Documentation
> Components: Documentation, Performance Benchmarks
> Affects Versions: 2.4.1
> Reporter: Remko Popma
> Assignee: Remko Popma
> Fix For: 2.6
>
>
> Reorganize and extend performance data on the site.
> *Async Loggers Manual Page*
> Should be more focussed. Proposed changes:
> * Move _"Location, location, location..."_ section on Location Info to
> general Performance page (keep anchors and link to the relevant Performance
> page section to avoid breaking existing links)
> * Similarly, move _"Throughput of Logging With Location
> (includeLocation="true")"_ table with throughput results to general
> Performance page
> * Move _"FileAppender vs. RandomAccessFileAppender"_ section to general
> Performance page. (Again, keep anchors and link to new section on Performance
> page to avoid breaking links.)
> * Rewrite opening paragraph of Async Logger manual page to remove reference
> to RandomAccessFile appender
> * Rewrite section on _Latency_
> ** The histogram shows service time (more useful for users is response time:
> service time + wait time).
> ** Bar chart diagram on "average latency" is nonsense. Latency is not a
> normal distribution so terms like "average latency" don't make sense. Remove
> this. (A histogram showing the full range of percentiles _does_ make sense.)
> ** Bar chart diagram with max of 99.99% of observations is better than
> average but still has large drawbacks: this is service time (omitting the
> crucial wait time) and how high are the peaks in the 0.01% we did not report?
> Better to remove this and instead show a histogram with the full range of
> percentages.
> *Performance Page*
> # Briefly explain about various aspects of "performance": peak measured
> throughput (what kind of bursts can we deal with?), sustained throughput, and
> response time (service time + wait time).
> # Then show how Log4j 2 compares to the alternatives (Logback, Log4j-1.2 and
> JUL) on all these three performance dimensions.
> # Finally, document some performance trade-offs for Log4j 2 functionality.
> *2. Comparison to alternative logging libraries*
> Link to Async Loggers page for bursty logging.
> Clarify that Async Appender exists to minimize dependencies but should be
> avoided if performance is a concern. Async Appender is NOT the default and
> should NOT be used for benchmarking. (I found [this loggly
> article|https://www.loggly.com/blog/benchmarking-java-logging-frameworks/]
> very frustrating in that respect.) Should probably also clarify that any
> benchmark that tests with only one thread doing logging is of limited use.
> For various appenders, compare Log4j2 to alternatives with regards to max
> sustained throughput (and separately, response time).
> * [File Appender max sustained
> thoughput|https://issues.apache.org/jira/browse/LOG4J2-1297?focusedCommentId=15256490&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15256490]
> * Socket appender (TCP/UDP)
> * Syslog appender (TCP/UDP)
> *3. Log4j 2 functionality performance trade-offs*
> * including location
> * Cost of various layouts (Gelf, HTML, XML, CSV, Pattern)
> * Cost of various Pattern Layout options
> * Cost of various appenders (File, RandomAccess File, MemoryMapped File,
> Console, Rewrite, other?). Use the same layout for comparison. Perhaps the
> PatternLayout with the {{%d [%t] %p %c - %m%n}} pattern.
> * Cost of various APIs/wrappers (SLF4J, Log4j1, JUL, Commons Logging)
> * JDBC appenders? - different JDBC drivers and target databases may have very
> different performance. May become a big project. We could do a quick
> comparison of the JDBC appender to the JDK Derby DB compared against
> FileAppender just to get an idea of max sustained throughput?
> -------------------
> Of the existing Performance page sections:
> * Briefly mention that disabled logging has no measurable cost, but
> de-emphasize this section by moving it down the page.
> * Parameterized messages: use these JMH [benchmark
> results|https://issues.apache.org/jira/browse/LOG4J2-1278?focusedCommentId=15216236&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15216236]?
> (Looks like parameterized messages are currently quite expensive...)
> * I like the part about the filters because it a) compares Log4j 2 to Logback
> and b) considers multithreaded applications. I'll turn this into a JMH test
> and show the result as a bar chart.
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