RFR: 8180421: Change default value of BiasedLockingStartupDelay to 0

[Daniel Daugherty]

----- robbin.ehn at oracle.com wrote:

> Hi all, please review.
> 
> On behalf of Stefan J, this patch changes the default value of
> BiasedLockingStartupDelay to 0.
> "The delay is however a problem for the some of the GC algorithms that
> use the mark-word."
> "Benchmark runs doesn't show any regressions for either startup times
> or steady state performance when setting it to 0."
> 
> CSR: https://bugs.openjdk.java.net/browse/JDK-8181778
> Issue: https://bugs.openjdk.java.net/browse/JDK-8180421
> 
> Thanks!
> 
> /Robbin
> 
> diff -r 26a2358e2796 src/share/vm/runtime/globals.hpp
> --- a/src/share/vm/runtime/globals.hpp	Fri Jun 23 15:16:23 2017 -0700
> +++ b/src/share/vm/runtime/globals.hpp	Mon Jun 26 15:03:34 2017 +0200
> @@ -1307,1 +1307,1 @@
> -  product(intx, BiasedLockingStartupDelay, 4000,                     
>       \
> +  product(intx, BiasedLockingStartupDelay, 0,                        
>       \

Thumbs up!

Dan