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9.2

How is System.currentTimeMillis implemented in Sun's JRE 5?

Asked by franked_it in Java Native Interface (JNI), Java Standard Edition

Tags: Java, native, JNI

I work on supporting a server application written in Java, using a couple versions of the Sun JRE, all in the JRE 5 line.  In working with some of our customers I've run into some weird issues with AMD Dual-core servers.  It appears that if software uses the RDTSC (Read TimeStamp Counter) to determine the current time there is likely a discrepancy between running this command if on Core 1 compared to running it on Core 2 due to power management slowing down the core frequency at times.

What I'm after is how did the JRE implement the System.currentTimeMillis?  Looks like it's a JNI method meaning it runs native C or C++ code.  I've downloaded the JRE source, but am missing something when trying to determine where that function is implemented in native code.

Just to be clear, I'm looking to know whether the JRE native function uses RDTSC, QueryPerformanceCounters, or some other method to get the system time.  Thanks!

(We are currently running JRE 1.5.0_10-b03.)
[+][-]08/19/09 05:57 PM, ID: 25138625Accepted Solution

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Zones: Java Native Interface (JNI), Java Standard Edition
Tags: Java, native, JNI
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Solution Provided By: objects
Participating Experts: 1
Solution Grade: A
 
[+][-]08/19/09 07:27 PM, ID: 25138980Author Comment

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