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Posted to commits@logging.apache.org by rp...@apache.org on 2016/05/03 19:54:42 UTC
logging-log4j2 git commit: LOG4J2-1179 performance page added graph &
paragraph on service time vs response time
Repository: logging-log4j2
Updated Branches:
refs/heads/master f342618a9 -> c5669e454
LOG4J2-1179 performance page added graph & paragraph on service time vs response time
Project: http://git-wip-us.apache.org/repos/asf/logging-log4j2/repo
Commit: http://git-wip-us.apache.org/repos/asf/logging-log4j2/commit/c5669e45
Tree: http://git-wip-us.apache.org/repos/asf/logging-log4j2/tree/c5669e45
Diff: http://git-wip-us.apache.org/repos/asf/logging-log4j2/diff/c5669e45
Branch: refs/heads/master
Commit: c5669e45456003568e7c41a6d1c4631f103d123e
Parents: f342618
Author: rpopma <rp...@apache.org>
Authored: Wed May 4 02:55:04 2016 +0900
Committer: rpopma <rp...@apache.org>
Committed: Wed May 4 02:55:04 2016 +0900
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.../ResponseTimeVsServiceTimeAsyncLoggers.png | Bin 0 -> 34779 bytes
src/site/xdoc/performance.xml | 8 ++++++++
2 files changed, 8 insertions(+)
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http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/c5669e45/src/site/resources/images/ResponseTimeVsServiceTimeAsyncLoggers.png
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diff --git a/src/site/resources/images/ResponseTimeVsServiceTimeAsyncLoggers.png b/src/site/resources/images/ResponseTimeVsServiceTimeAsyncLoggers.png
new file mode 100644
index 0000000..7aff300
Binary files /dev/null and b/src/site/resources/images/ResponseTimeVsServiceTimeAsyncLoggers.png differ
http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/c5669e45/src/site/xdoc/performance.xml
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diff --git a/src/site/xdoc/performance.xml b/src/site/xdoc/performance.xml
index f7087aa..16ac240 100644
--- a/src/site/xdoc/performance.xml
+++ b/src/site/xdoc/performance.xml
@@ -70,6 +70,14 @@
<p>
What is often measured and reported as <em>latency</em> is actually <em>service time</em>,
which unfortunately hides the wait time.
+ The below graph shows response time and service time of the same system under a load of 100,000 messages
+ per second. Out of 25 million measurements, only ~50 are more than 200 microseconds, less than 0.001%.
+ In a service time-only graph this would hardly be visible.
+ However, the wait time adds up and the response time graph shows that in reality many more events are impacted
+ by these delays.
+ </p>
+ <p><img src="images/ResponseTimeVsServiceTimeAsyncLoggers.png" /></p>
+ <p>
To learn more, watch Gil Tene's
<a href="http://www.infoq.com/presentations/latency-response-time">How NOT to measure latency</a>
(and prepare to be shocked).