On Mon, 21 Oct 2024 18:18:12 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. Is `volatile` a known performance decelerator? I don't see any source control history for that part of the code, so I can only speculate at `previousKey` was to improve benchmarking. Did you try just removing `volatile` and leaving the rest of the code? ------------- PR Comment: https://git.openjdk.org/jdk/pull/21622#issuecomment-2436074968
