From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.devel Subject: Re: [PATCH] Re: Bignum performance Date: Tue, 15 Aug 2023 16:28:09 +0200 Message-ID: <87zg2sfkhy.fsf@dataswamp.org> References: <20230809094655.793FC18A4654@snark.thyrsus.com> <83fs4rjq9j.fsf@gnu.org> <87jzu2tvfc.fsf@dataswamp.org> <87y1ih3mc1.fsf@localhost> <87h6p5kcek.fsf@dataswamp.org> <87msyxoj2t.fsf@localhost> <875y5lkb4b.fsf@dataswamp.org> <87bkfdsmde.fsf@localhost> <87v8dlihc5.fsf@dataswamp.org> <87il9l1i59.fsf@localhost> <87edk9icis.fsf@dataswamp.org> <871qg84qij.fsf@localhost> <871qg8l03q.fsf@dataswamp.org> <877cpzl357.fsf@localhost> <87sf8ni85u.fsf@dataswamp.org> <87ttt3fdjt.fsf@localhost> <877cpyicv1.fsf@dataswamp.org> <87v8dimjiv.fsf@yahoo.com> <878raert6t.fsf@localhost> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="25258"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: emacs-devel@gnu.org Cancel-Lock: sha1:M71884NhZBTaQJwYq6AlMqgXyyU= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Tue Aug 15 16:54:11 2023 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1qVvQw-0006HC-ST for ged-emacs-devel@m.gmane-mx.org; Tue, 15 Aug 2023 16:54:10 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qVvPA-0006Kx-Ny; Tue, 15 Aug 2023 10:52:20 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qVv1z-0005Ul-2i for emacs-devel@gnu.org; Tue, 15 Aug 2023 10:28:23 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qVv1u-000129-K1 for emacs-devel@gnu.org; Tue, 15 Aug 2023 10:28:22 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1qVv1s-0001qb-Rk for emacs-devel@gnu.org; Tue, 15 Aug 2023 16:28:16 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: emacs-devel@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=ged-emacs-devel@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Tue, 15 Aug 2023 10:52:17 -0400 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:308759 Archived-At: Ihor Radchenko wrote: >> AFAIU, no conversion takes place between ``Elisp formats'' >> and GMP formats. Our bignums rely on GMP for all data >> storage and memory allocation. > > Thanks for the clarification! So, GMP is not as fast as > SBCL's implementation after all. SBCL uses > https://github.com/sbcl/sbcl/blob/master/src/code/bignum.lisp > - a custom bignum implementation, which is clearly faster > compared to GMP (in the provided benchmark): > > perf record ~/Git/emacs/src/emacs -Q -batch -l /tmp/fib.eln > 0.739 s > (0.007 s for SBCL) > > 17.11% emacs libgmp.so.10.5.0 [.] __gmpz_sizeinbase > 7.35% emacs libgmp.so.10.5.0 [.] __gmpz_add > > ^^ already >0.1 sec. And we are not the only ones using GMP, right? So maybe this issue in particular would be solved even more broadly by a SBCL -> GMP transition ... BTW, here are a bunch of new benchmarks from elisp-benchmarks brought to CL. Ironically, as some of them were from CL in the first place. But it is the way it goes. https://dataswamp.org/~incal/cl/bench/ Several benchmarks are to Emacs specific to make sense (work) anywhere else, but there are still a few left to do. Not that in fib.cl there are now, also brought from elisp-benchmarks, a bunch of new implementations to try. -- underground experts united https://dataswamp.org/~incal