You can push a bufmod on the fifo and use messages up to the maximum streams message size. rick
On Fri, Jul 10, 2009 at 10:48:29AM -0500, Bob Friesenhahn wrote: > X-Authority-Analysis: v=1.0 c=1 a=CJn96HSh7NQA:10 > a=lzmFrgBnj+XnLHvemvnKkQ==:17 a=RLQEIbXJAAAA:8 a=tx7JrHvRAAAA:8 > a=ep_KMAzDAAAA:8 a=b2JNCujJsANkwUJLj04A:9 a=uVteT0YrbvIAIDKuawkA:7 > a=7_-5LuXN-4LWqWdEruy4W3aRDXUA:4 a=TC1Ce7_l9HwA:10 > X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on > oss-mail1.opensolaris.org > X-Spam-Level: > X-Spam-Status: No, score=-2.6 required=5.0 tests=AWL,BAYES_00 > autolearn=unavailable version=3.2.5 > X-Original-To: perf-discuss@opensolaris.org > Delivered-To: perf-discuss@opensolaris.org > Date: Fri, 10 Jul 2009 10:48:29 -0500 (CDT) > From: Bob Friesenhahn <bfrie...@simple.dallas.tx.us> > X-X-Sender: bfrie...@freddy.simplesystems.org > To: Roland Mainz <roland.ma...@nrubsig.org> > In-Reply-To: <4a56aaee.f6438...@nrubsig.org> > X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.2 > (blade.simplesystems.org [65.66.246.90]); > Fri, 10 Jul 2009 10:48:30 -0500 (CDT) > Cc: OpenSolaris Performance/HPC discussions <perf-discuss@opensolaris.org>, > OpenSolaris Shell discussions <shell-disc...@opensolaris.org>, > Garrett D'Amore <gdam...@sun.com> > Subject: Re: [perf-discuss] Changing the default buffer sizes for pipes ? > X-BeenThere: perf-discuss@opensolaris.org > X-Mailman-Version: 2.1.12 > Precedence: list > List-Id: Performance General Discussion <perf-discuss.opensolaris.org> > List-Unsubscribe: <http://mail.opensolaris.org/mailman/options/perf-discuss>, > <mailto:perf-discuss-requ...@opensolaris.org?subject=unsubscribe> > List-Archive: <http://mail.opensolaris.org/pipermail/perf-discuss> > List-Post: <mailto:perf-discuss@opensolaris.org> > List-Help: <mailto:perf-discuss-requ...@opensolaris.org?subject=help> > List-Subscribe: <http://mail.opensolaris.org/mailman/listinfo/perf-discuss>, > <mailto:perf-discuss-requ...@opensolaris.org?subject=subscribe> > Errors-To: perf-discuss-boun...@opensolaris.org > > On Fri, 10 Jul 2009, Roland Mainz wrote: >>> >>> Some applications may misbehave or lock-up if the size of the pipe >>> buffer is changed. >> >> Erm... why ? > > You have already noticed that the size is hard-coded in Solaris > applications (by PIPE_BUF) since the dawn of time. Pipes offer > properties such as atomic reads and writes. PIPE_BUF declares the > maximum size of an atomic write. Some applications depend on this FIFO > behavior for message passing. > > You should feel happy that Solaris is using 5120 rather than 512 like > FreeBSD. > > Bob > -- > Bob Friesenhahn > bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ > GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ > _______________________________________________ > perf-discuss mailing list > perf-discuss@opensolaris.org -- Rickey C. Weisner Software Development and Performance Specialist Principal Field Technologist Systems Quality Office cell phone: 615-308-1147 email: rick.weis...@sun.com _______________________________________________ perf-discuss mailing list perf-discuss@opensolaris.org
