From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Love Subject: Re: OpenBLAS and performance Date: Wed, 20 Dec 2017 14:48:42 +0000 Message-ID: <87h8sl78vp.fsf@albion.it.manchester.ac.uk> References: <20171219104956.GB806@thebird.nl> <87tvwl7h4w.fsf@albion.it.manchester.ac.uk> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from eggs.gnu.org ([2001:4830:134:3::10]:48580) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eRfg8-0005Qh-7u for guix-devel@gnu.org; Wed, 20 Dec 2017 09:49:04 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eRfg4-0003EL-0M for guix-devel@gnu.org; Wed, 20 Dec 2017 09:49:04 -0500 Received: from [195.159.176.226] (port=58231 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1eRfg3-00038o-QI for guix-devel@gnu.org; Wed, 20 Dec 2017 09:48:59 -0500 Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1eRfdy-0004fW-Q9 for guix-devel@gnu.org; Wed, 20 Dec 2017 15:46:50 +0100 List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org Sender: "Guix-devel" To: guix-devel@gnu.org I wrote: > If you do provide some sort of threaded version for Python, then as far > as I remember it must use pthreads, not OpenMP, though you want the > OpenMP version for other purposes, and I hadn't realized there wasn't > one currently. I was confused. I see the only version of the library shipped is built with pthreads. I think there should be serial, pthreads, and OpenMP versions, as for Fedora. It may also be useful to provide the 64-bit integer versions, like Fedora; that's useful for at least a flagship chemistry program. I also remembered the problems with 0.2.20. I'll send a patch for the wrong cache size used on some x86_64 when I get a chance.