From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Ihor Radchenko Newsgroups: gmane.emacs.devel Subject: Re: [PATCH] Re: Bignum performance Date: Mon, 14 Aug 2023 07:15:06 +0000 Message-ID: <878raert6t.fsf@localhost> 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> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="37519"; mail-complaints-to="usenet@ciao.gmane.io" Cc: emacs-devel@gnu.org To: Po Lu Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Mon Aug 14 09:15:19 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 1qVRnI-0009Xc-7l for ged-emacs-devel@m.gmane-mx.org; Mon, 14 Aug 2023 09:15:16 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qVRmp-0003DS-Nl; Mon, 14 Aug 2023 03:14:47 -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 1qVRmo-0003Cz-49 for emacs-devel@gnu.org; Mon, 14 Aug 2023 03:14:46 -0400 Original-Received: from mout02.posteo.de ([185.67.36.66]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qVRml-0000R8-LD for emacs-devel@gnu.org; Mon, 14 Aug 2023 03:14:45 -0400 Original-Received: from submission (posteo.de [185.67.36.169]) by mout02.posteo.de (Postfix) with ESMTPS id 8BDC3240104 for ; Mon, 14 Aug 2023 09:14:41 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1691997281; bh=EvZ4IwJy2/K0C1YsY5CkYSVC9j6fpeT3xDRNIqQZE1k=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:From; b=okAfnRIfkB1ltY8AwcB6qOWXfdv0bBAN71jubzxkgr/76uBkeAYdRPiD8w0WEsVtV EFhdS/bDqfT3jbRJpAcPd25XqTxXVM1Em4qZnBAFwVO7RnoKc5jxw6IzDvhPYJ0ZzP Pi8sFSkn5ZjEAIuGTMCGXr44WoCn3t8/j95129pT0KAT1c/5q6nrWveCHt6q7I7NCJ L3klOqvjIYW3YofTcYavNCuyN/0CEviSQ5XWV4n4DERWI//8GneTXBNMfff+NWhp6C COcsqkmZlw/5LR4/q927SSfc7adMzKyXP2YWdNpCpnodkFLC+iizplDea6EYgCvs+O HWBfSvPUtDdUg== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4RPQdD5xgsz9rxL; Mon, 14 Aug 2023 09:14:40 +0200 (CEST) In-Reply-To: <87v8dimjiv.fsf@yahoo.com> Received-SPF: pass client-ip=185.67.36.66; envelope-from=yantar92@posteo.net; helo=mout02.posteo.de X-Spam_score_int: -53 X-Spam_score: -5.4 X-Spam_bar: ----- X-Spam_report: (-5.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H5=-1, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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:308703 Archived-At: Po Lu writes: >>> And we have huge overheads converting things back-and-forth >>> between GMP and Elisp formats. It is by choice. And my patch >>> did not do anything about this difference. > > 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. 6.51% emacs emacs [.] arith_driver 6.03% emacs libc.so.6 [.] malloc 5.57% emacs emacs [.] allocate_vectorlike 5.20% emacs [unknown] [k] 0xffffffffaae01857 4.16% emacs libgmp.so.10.5.0 [.] __gmpn_add_n_coreisbr 3.72% emacs emacs [.] check_number_coerce_marker 3.35% emacs fib.eln [.] F666962_fib_0 3.29% emacs emacs [.] allocate_pseudovector 2.30% emacs emacs [.] Flss -- Ihor Radchenko // yantar92, Org mode contributor, Learn more about Org mode at . Support Org development at , or support my work at