RFR: 8180421: Change default value of BiasedLockingStartupDelay to 0

[Robbin Ehn]

Thanks Dan!

/Robbin

On 06/27/2017 04:45 PM, Daniel Daugherty wrote:
> ----- 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
>