RFR: 8256507: Add a micro benchmark for JDK-8153005

[Aleksey Shipilev]

On Wed, 18 Nov 2020 14:49:54 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> test/micro/org/openjdk/bench/java/security/PKCS12KeyStores.java line 65:
>> 
>>> 63:     }
>>> 64: 
>>> 65:     static {
>> 
>> Move these to 
>> 
>> @Setup
>> public void setup() throws Exception {
>>   ...
>> }
>> 
>> This would save you a `try-catch` section, and harness would properly fail on setup exception.
>
> Newbie on JMH. Is it worth designing the byte[] fields as static? I assume there will be different objects for different forks but only one for different threads?

It does not worth it to make fields `static`. It is much better to let JMH manage the setup, that's what `@Setup` methods are for. If you want to share all instance fields across the thread, then use `@State(Scope.Benchmark)`, it is now `Scope.Thread`.

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PR: https://git.openjdk.java.net/jdk/pull/1277