Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262665AbUKVTak (ORCPT ); Mon, 22 Nov 2004 14:30:40 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262669AbUKVTai (ORCPT ); Mon, 22 Nov 2004 14:30:38 -0500 Received: from omx2-ext.sgi.com ([192.48.171.19]:51073 "EHLO omx2.sgi.com") by vger.kernel.org with ESMTP id S262498AbUKVTYT (ORCPT ); Mon, 22 Nov 2004 14:24:19 -0500 Message-ID: <41A23D15.3040207@sgi.com> Date: Mon, 22 Nov 2004 13:25:09 -0600 From: Ray Bryant User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.2) Gecko/20040805 Netscape/7.2 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Robin Holt CC: Kernel Mailing List , "linux-ia64@vger.kernel.org" , lse-tech , Dean Roe , Brian Sumner , John Hawkes Subject: Re: scalability of signal delivery for Posix Threads References: <41A20AF3.9030408@sgi.com> <20041122171932.GA19440@lnx-holt.americas.sgi.com> In-Reply-To: <20041122171932.GA19440@lnx-holt.americas.sgi.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1335 Lines: 33 Robin Holt wrote: > On Mon, Nov 22, 2004 at 09:51:15AM -0600, Ray Bryant wrote: > >>We've encountered a scalability problem with signal delivery. Our >>application >>is attempting to use ITIMER_PROF to deliver one signal per clock tick to >>each >>thread of a ptrheaded (NPTL). These threads are created with CLONE_SIGHAND, >>so that there is a single sighand->siglock for the entire application. > > > Ray, can you provide a simple example application that trips this case? I'll do that, but it may be after the Thanksgiving holiday when I get it out to the mailing list. It's a minor thing, but the test we are using now is an OpenMP application (written in .c) and I'd propose rewriting it using POSIX threads without OpenMP for a more general audience -- Best Regards, Ray ----------------------------------------------- Ray Bryant 512-453-9679 (work) 512-507-7807 (cell) raybry@sgi.com raybry@austin.rr.com The box said: "Requires Windows 98 or better", so I installed Linux. ----------------------------------------------- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/