From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Bavier Subject: Re: Problems with GNU Parallel and ulimit Date: Mon, 14 Aug 2017 23:58:37 -0500 Message-ID: <20170814235837.0a42fe85@centurylink.net> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Received: from eggs.gnu.org ([2001:4830:134:3::10]:36820) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dhTwB-00085H-Vn for help-guix@gnu.org; Tue, 15 Aug 2017 00:58:47 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dhTw8-00058V-VR for help-guix@gnu.org; Tue, 15 Aug 2017 00:58:44 -0400 Received: from mail.centurylink.net ([205.219.233.9]:47502 helo=smtp.centurylink.net) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dhTw8-000583-Od for help-guix@gnu.org; Tue, 15 Aug 2017 00:58:40 -0400 In-Reply-To: 87tw1a0xk1.fsf@fastmail.com List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-guix-bounces+gcggh-help-guix=m.gmane.org@gnu.org Sender: "Help-Guix" To: help-guix@gnu.org Sending response to the list this time... > Arun Isaac writes: > > > Leo Famulari writes: > > > >> On Mon, Aug 14, 2017 at 12:46:25PM +1000, Ben Woodcroft wrote: > >>> On 14/08/17 12:31, Arun Isaac wrote: > >>> > Does `parallel' work for anybody? When I run > >>> > > >>> > $ ls | parallel echo > >>> > > >>> > I get the following error message, and nothing happens. > >>> It works fine for me using Guix on a foreign OS, and has since I > >>> can remember. > >>> ben > >> > >> Same here. Arun, can you give some more details about your system? > > > > This is probably a problem only on GuixSD systems. Could you try on > > GuixSD instead of using Guix on a foreign distro? > > I tested it on GuixSD, works fine. Are you trying the command in a > folder with > 1024 files perhaps? What does `ulimit -n` print? The problem appears if you do not have 'perl' available in $PATH. GNU parallel calls it recursively for a few tasks: $ guix package -I | grep "perl" $ echo $? 1 $ parallel echo ::: 1 2 3 ... parallel: Warning: Raising ulimit -u or /etc/security/limits.conf may help. parallel: Error: No more processes: cannot run a single job. Something is wrong at 1. $ guix environment --ad-hoc perl [dev]$ parallel echo ::: 1 2 3 1 2 3 There is some path patching that goes on in the package recipe, but it must have gone out of sync in latest versions. The 'post-install-test' phase wouldn't catch this particular error without '(setenv "PATH" "")'. I wouldn't feel quite comfortable doing a "blind" update of the regex, since some mentions of "perl" I think are meant to be executed by remote hosts and so shouldn't be patched to absolute store references. It might be useful to get Ole's opinion on this. `~Eric