RFR [XS] : 8227247: tools/sjavac/IdleShutdown.java fails with AssertionError: Error too big on windows

[Baesken, Matthias]

Hello,
   please review this small change to  tools/sjavac/IdleShutdown.java  .
It  allows higher timeout differences and gives a better error output .


On Windows (especially on slower virtualized machines) the langtools test tools/sjavac/IdleShutdown.java shows sporadic failures.
The error we see is :
IdleShutdown.java: java.lang.AssertionError: Error too big

Reason is that the "timeout error" is larger than the allowed error of 300 ms    ( 3000 ms *0.1)  :

        if (error > TIMEOUT_MS * .1)
            throw new AssertionError("Error too big");

We see sometimes errors in the range of 300-900 ms .
For example :

After 16166 ms: Timeout error: 609 ms

Idea is to increase the allowed timeout error to make the test more stable.



Bug/webrev :

https://bugs.openjdk.java.net/browse/JDK-8227247

http://cr.openjdk.java.net/~mbaesken/webrevs/8227247.0/webrev/


Thanks, Matthias
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