https://issues.apache.org/bugzilla/show_bug.cgi?id=56966
Bug ID: 56966
Summary: AccessLogValve's elapsed time has 15ms precision on
Windows
Product: Tomcat 8
Version: trunk
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: t...@tom-fitzhenry.me.uk
The problem:
AccessLogValve's elapsed time variables (%D and %T) calculate elapsed time
using System.currentTimeMillis()[0]. System.currentTimeMillis() only has a
precision of ~15ms on Windows.[1]
A potential fix:
Calculate elapsed time using a precision timer, such as System.nanoTime(),
which has a higher precision (dependent on OS).
References:
0. See
https://github.com/apache/tomcat/blob/3986c5dc894fda541aa1855503debe1a8c01fc9f/java/org/apache/catalina/connector/CoyoteAdapter.java#L266
, which gets fed into the 'time' parameter of
https://github.com/apache/tomcat/blob/99029882cb020f8d354ad4e2ef46e8edacb0c73d/java/org/apache/catalina/valves/AbstractAccessLogValve.java#L1183
1.
http://stackoverflow.com/questions/7859019/system-currenttimemillis-is-not-accurate-on-windows-xp
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