On 2017-03-13 16:56, Mandy Chung wrote:
On Mar 12, 2017, at 9:25 PM, Ralph Goers <[email protected]> wrote:
1. Walking the Throwable StackTraceElements is significantly faster in Java 8
than Java 9. I am not sure what benchmark Brent used but my results differ.
I’ll be surprised if jdk 9 Throwable is slower than jdk 8 as JDK-8150778 should
give some improvement.
We will look into it.
I've verified this on my machine, although the difference is smaller
when comparing 8 and 9 on the benchmarks that run on both (~10%).
Quick profiling indicates that we're spending time in
StringTable::lookup_shared in 9, which could be due to changes in
https://bugs.openjdk.java.net/browse/JDK-8015086
I'm currently evaluating if the performance fix suggested by Ioi has an
effect: https://bugs.openjdk.java.net/browse/JDK-8175863
If so, this might be something we need to escalate.
/Claes
