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Sensor Actiondata has wrong timestamp on Linux systems with AMD processor and using TSC timer (Doc ID 463731.1)

Last updated on APRIL 23, 2019

Applies to:

Oracle(R) BPEL Process Manager 10g - Version 10.1.3.1 and later
Linux x86

Symptoms

Running BPEL process with Sensor ActionData on a system with AMD processor and using TSC as
internal kernel timer will cause wrong timestamps in the Sensor ActionData.
Additional this wrong timestamp can cause performance issues during stress tests or in situation with
high workload.

This behaviour can be checked using this small java program :

public class TestCurrentTime {
    public TestCurrentTime() {
    }
        public static void main(String[] args) {
            System.out.println("Checking for monotonically increasing time");
            long from = System.currentTimeMillis();
            for (int i = 0; i < 1000000; i++) {
                long to = System.currentTimeMillis();
                if (to < from)
                System.out.println("Time went backwards");
                from = to;
            }
        }

This program will find out if and how much the time will backward on the OS.

Affected platforms are : SUSE Linux9 and RedHat 4

Changes

Do not use TSC timer, configure the kernel to use different timer.


Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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