From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Andy Moreton Newsgroups: gmane.emacs.devel Subject: Re: [PATCH] support for accessing CPU/core count (processor-count) Date: Sun, 10 Oct 2021 11:50:14 +0100 Message-ID: <861r4t9ms9.fsf@gmail.com> References: Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="7089"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (windows-nt) To: emacs-devel@gnu.org Cancel-Lock: sha1:jDRSq7V1Mk7QcjkoLMP0JuFVeOQ= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sun Oct 10 12:52:18 2021 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 1mZWRF-0001iK-JZ for ged-emacs-devel@m.gmane-mx.org; Sun, 10 Oct 2021 12:52:17 +0200 Original-Received: from localhost ([::1]:51908 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mZWRE-0000nh-HE for ged-emacs-devel@m.gmane-mx.org; Sun, 10 Oct 2021 06:52:16 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:56472) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mZWPa-00082M-6h for emacs-devel@gnu.org; Sun, 10 Oct 2021 06:50:43 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:35596) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mZWPS-00016P-1Q for emacs-devel@gnu.org; Sun, 10 Oct 2021 06:50:31 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1mZWPO-0009vr-GX for emacs-devel@gnu.org; Sun, 10 Oct 2021 12:50:22 +0200 X-Injected-Via-Gmane: http://gmane.org/ 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: 5 X-Spam_score: 0.5 X-Spam_bar: / X-Spam_report: (0.5 / 5.0 requ) BAYES_00=-1.9, DKIM_ADSP_CUSTOM_MED=0.001, FORGED_GMAIL_RCVD=1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, NML_ADSP_CUSTOM_MED=0.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 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" Xref: news.gmane.io gmane.emacs.devel:276653 Archived-At: On Sun 10 Oct 2021, Campbell Barton wrote: > Hi, this patch adds support for accessing the number of CPU's / cores on a > system, matching CPython's multiprocessing.cpu_count() [0]. > > I've only tested this for Linux, this includes code that should work on other > platforms, although that would need to be double-checked of course. > For reference I checked CPython / Blender & Stack-overflow [1] > > Accessing this information can be useful to automatically detect the number of > jobs to run. This logic already exists in `comp-effective-async-max-jobs' from comp.el, as an internal implementation detail. Perhaps it would be better to refactor that code. AndyM