RFR: Load coops base shift from AOTRuntimeConstants in AOT code [v5]

[Ashutosh Mehra]

On Thu, 26 Sep 2024 14:02:11 GMT, Andrew Dinn <adinn at openjdk.org> wrote:

>> Andrew Dinn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Use the force to wrangle register sets
>
> Ok, so here are the proper results, first when the heap is defaulted:
> 
> Run 1:
> 
>     ============================== jvm1 ============================
>     [1_xoff] Premain JDK (CDS disabled)                    235.10 ms
>     [1_xon ] Premain JDK (CDS enabled)                     111.21 ms
>     [1_td  ] Premain Prototype (CDS + Training Data)       109.45 ms
>     [1_aot ] Premain Prototype (CDS + Training Data + AOT)  56.87 ms
>     ============================== jvm2 ============================
>     [2_xoff] Premain JDK (CDS disabled)                    233.21 ms
>     [2_xon ] Premain JDK (CDS enabled)                     111.37 ms
>     [2_td  ] Premain Prototype (CDS + Training Data)       107.96 ms
>     [2_aot ] Premain Prototype (CDS + Training Data + AOT)  59.00 ms
>     ================================================================
> 
> Run 2:
> 
>     ============================== jvm1 ============================
>     [1_xoff] Premain JDK (CDS disabled)                    235.84 ms
>     [1_xon ] Premain JDK (CDS enabled)                     112.28 ms
>     [1_td  ] Premain Prototype (CDS + Training Data)       108.45 ms
>     [1_aot ] Premain Prototype (CDS + Training Data + AOT)  57.76 ms
>     ============================== jvm2 ============================
>     [2_xoff] Premain JDK (CDS disabled)                    236.09 ms
>     [2_xon ] Premain JDK (CDS enabled)                     111.91 ms
>     [2_td  ] Premain Prototype (CDS + Training Data)       108.86 ms
>     [2_aot ] Premain Prototype (CDS + Training Data + AOT)  59.80 ms
>     ================================================================
> 
> 
> Run 3:
> 
> 
>     ============================== jvm1 ============================
>     [1_xoff] Premain JDK (CDS disabled)                    231.32 ms
>     [1_xon ] Premain JDK (CDS enabled)                     111.47 ms
>     [1_td  ] Premain Prototype (CDS + Training Data)       108.92 ms
>     [1_aot ] Premain Prototype (CDS + Training Data + AOT)  56.26 ms
>     ============================== jvm2 ============================
>     [2_xoff] Premain JDK (CDS disabled)                    233.96 ms
>     [2_xon ] Premain JDK (CDS enabled)                     114.21 ms
>     [2_td  ] Premain Prototype (CDS + Training Data)       107.92 ms
>     [2_aot ] Premain Prototype (CDS + Training Data + AOT)  60.01 ms
>     ================================================================
> 
> Now the results when heap size is set to 24Mb:
> 
> Run 1:
> 
>     ============================== jvm1 ===========================...

@adinn @vnkozlov We should also consider the fact that, as the things stand, forcing the JIT compiled methods to always use shift and fixed base could have an impact on the peak throughput. Do we have numbers how much is the peak throughput impacted? If it does then we need to decide what do we let go - startup or the peak throughput?

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PR Comment: https://git.openjdk.org/leyden/pull/20#issuecomment-2377502837