uschindler commented on PR #12737: URL: https://github.com/apache/lucene/pull/12737#issuecomment-1787973537
Hi, > So I'd like to avoid use of FMA on AMD, where some cpus it causes slowdowns compared to mul+add which allows more parallelism due to architecture. If somebody notices a slowdown, they have the option to use `-XX:-UseFMA`. But with your patch there's no way to turn it on. My AMD, which is a server CPU (in contrast to Threadripper, which is a workstation CPU), works faster with FMA. How can I enable it with your patch? You disable it without any chance to enable it by detecting a bullshit / incorrectly used VM flag that's not even meant to detect AMD server CPUs!? Sorry that insane. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org
