From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ray Bryant Date: Mon, 22 Nov 2004 19:25:09 +0000 Subject: Re: scalability of signal delivery for Posix Threads Message-Id: <41A23D15.3040207@sgi.com> List-Id: References: <41A20AF3.9030408@sgi.com> <20041122171932.GA19440@lnx-holt.americas.sgi.com> In-Reply-To: <20041122171932.GA19440@lnx-holt.americas.sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Robin Holt Cc: Kernel Mailing List , "linux-ia64@vger.kernel.org" , lse-tech , Dean Roe , Brian Sumner , John Hawkes 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. -----------------------------------------------