From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cc-smtpout1.netcologne.de (cc-smtpout1.netcologne.de [IPv6:2001:4dd0:100:1062:25:2:0:1]) by sourceware.org (Postfix) with ESMTPS id 3BD74385EC56 for ; Tue, 22 Dec 2020 15:10:59 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 3BD74385EC56 Received: from cc-smtpin2.netcologne.de (cc-smtpin2.netcologne.de [89.1.8.202]) by cc-smtpout1.netcologne.de (Postfix) with ESMTP id B616C133C5; Tue, 22 Dec 2020 16:10:56 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by cc-smtpin2.netcologne.de (Postfix) with ESMTP id B272E11EB1; Tue, 22 Dec 2020 16:10:56 +0100 (CET) Received: from [2001:4dd7:c9b8:0:b87a:57e9:5345:9efe] (helo=cc-smtpin2.netcologne.de) by localhost with ESMTP (eXpurgate 4.11.6) (envelope-from ) id 5fe20c80-024d-7f0000012729-7f000001adc2-1 for ; Tue, 22 Dec 2020 16:10:56 +0100 Received: from linux-p51k.fritz.box (2001-4dd7-c9b8-0-b87a-57e9-5345-9efe.ipv6dyn.netcologne.de [IPv6:2001:4dd7:c9b8:0:b87a:57e9:5345:9efe]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by cc-smtpin2.netcologne.de (Postfix) with ESMTPSA; Tue, 22 Dec 2020 16:10:55 +0100 (CET) Subject: Re: Update on shared memory coarrays To: dhumieres.dominique@free.fr Cc: fortran@gcc.gnu.org References: <3d57a473-4025-890d-d365-6c2f82e7f513@netcologne.de> <0e1c519febec1c47c411339269455b9d@free.fr> <7e332e70-246e-b44e-7689-477642bf114c@netcologne.de> <23f5fbb548e75b1a5029162b31a8ddd7@free.fr> <522f101eda4e212f98f1f071165a46e5@free.fr> <79fdfc28ee95e21ba173dad5780b4e02@free.fr> From: Thomas Koenig Message-ID: Date: Tue, 22 Dec 2020 16:10:54 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0 MIME-Version: 1.0 In-Reply-To: <79fdfc28ee95e21ba173dad5780b4e02@free.fr> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: de-DE Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, NICE_REPLY_A, RCVD_IN_DNSWL_LOW, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: fortran@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Fortran mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Dec 2020 15:11:01 -0000 Hi Dominique, > Indeed! I can try to do some debugging under supervision. > Could you please tell me where to start? Thanks for your offer. The first thing to do would be to see where it hangs. Generating a syscall trace (by whatever tool is used on MacOS, dtrace? ktrace?) would be a first step. A next step would be to compile a program with debug info and run it under a debugger, then see where it hangs. I'm not sure - do you use gdb on your system? If you do, the following lines in your .gdbinit define better_mp_debug set detach-on-fork off set schedule-multiple on set follow-fork-mode parent set non-stop on set target-async on set print symbol-loading off end will give you a macro "better_mp_debug" which will ease debugging of forked processes enormously. My lack of experience with MacOS extends to which tools to use for debugging, unfortunately. Best regards Thomas