On Tue, 29 Oct 2024 22:31:28 GMT, Vladimir Ivanov <vaiva...@openjdk.org> wrote:
>> This patch remove access to the shared variable to fix scalability issue in
>> the multithread environment. According to testing by the
>> specjvm2008::crypto.rsa the one thread performance reduced for less than 1%
>> while the score for the multithread run increased in ~2x. For the 2 socket
>> system with Xeon 8480+ numbers looks as:
>> • 1 thread: 643.15 for original version vs 642.54 for patched one;
>> • 224 threads: 22446.19 for original vs 46147.41 for patched.
>> The RSABench microbenchmark reports no score changes for the 1 thread
>> (average for all testcases) and 2.4% improvement for the 224 threads.
>
> Vladimir Ivanov has updated the pull request incrementally with one
> additional commit since the last revision:
>
> 8317538: Potential bottleneck in Provider::getService:
> specjvm2008::crypto.rsa have scalability issue for high vCPU numbers
src/java.base/share/classes/java/security/Provider.java line 1314:
> 1312: // list and queries each provider with the same values until it
> finds
> 1313: // a matching service
> 1314: private transient ServiceKey previousKey =
`transient` is for serialization and I don't think this should affect
performance here. Have you tried just `private ServiceKey ...`?
src/java.base/share/classes/java/security/Provider.java line 1315:
> 1313: // a matching service
> 1314: private transient ServiceKey previousKey =
> 1315: new ServiceKey("", "",
> false);
Please fix the formatting while you are making the change. If a second line is
still needed, it should be 4 whitespaces from the left margin. The formatting
was wrong before your change. Thanks
-------------
PR Review Comment: https://git.openjdk.org/jdk/pull/21719#discussion_r1826316363
PR Review Comment: https://git.openjdk.org/jdk/pull/21719#discussion_r1826317282
