[11] RFR(S) 8193126: Incorrect setting of MetaspaceSize and NewSizeThreadIncrease when using JVMCI compiler

[Vladimir Kozlov]

Thank you, Igor

Vladimir

On 7/6/18 12:25 PM, Igor Veresov wrote:
> Looks good.
> 
> igor
> 
>> On Jul 5, 2018, at 4:17 PM, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:
>>
>> http://cr.openjdk.java.net/~kvn/8193126/webrev.00/
>> https://bugs.openjdk.java.net/browse/JDK-8193126
>>
>> JVMCI reset some flags values to improve Graal code generation. But some settings were copied from C1 setting which cause change of Server VM behavior with Graal JIT vs when C2 JIT is used. For example, the default MetaspaceSize value with C2 is about 21Mb but it was reset to 12Mb for JVMCI which causes addition metaspace collections and Java heap collections too (for class unloading).
>>
>> It also cause some unexpected failures in testing. Like JDK-8203174.
>>
>> I propose to select max values for some sizes.
>>
>> Tested tier1, tier2, graal-tier3, graal-tier4
>>
>> -- 
>> Thanks,
>> Vladimir
>