RFR: 8317542: Specjvm::xml have scalability issue for high vCPU numbers

[Vladimir Ivanov]

On Thu, 31 Oct 2024 21:33:11 GMT, Vladimir Ivanov <vaivanov at openjdk.org> wrote:

> The synchronization block may be substituted by the 'volatile' variable smaller synchronization block.
> It reduce the total blocking time for the specjvm2008::xml.validation workload and improve the reported score.
> Scores for the 112vCPU on the with 28GB heap increased from 17915.83 to 22943.2.
> Unit tests was not affected:
> Test summary
> ==============================
>    TEST                                              TOTAL  PASS  FAIL ERROR
>    jtreg:test/jaxp                                     516   516     0     0
>    jtreg:test/jdk/javax/xml                             70    70     0     0
> ==============================
> TEST SUCCESS
> 
> The tier1 is OK too.

specjvm2008::xml.validation scores
Original build: 1 vCPU: 415.6; 16vCPU: 5755.27; 32 vCPU: 10467.91; 112vCPU: 17524.4
Patched build: 1vCPU: 415.65; 16vCPU: 5832.28; 32vCPU: 10622.34; 112vCPU: 21773.84
The run-to-run variation for this workload ~5%. So, for the low vCPU numbers no differences with/without patch.

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PR Comment: https://git.openjdk.org/jdk/pull/21815#issuecomment-2457981375