From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 12 Feb 2015 19:43:37 +0100 From: Gilles Chanteperdrix Message-ID: <20150212184337.GA10928@hermes.click-hack.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Subject: Re: [Xenomai] application start is slower with xenomai 2.6.4 than 2.4.10 List-Id: Discussions about the Xenomai project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: JK.Behnke@web.de Cc: xenomai@xenomai.org On Thu, Feb 12, 2015 at 02:23:11PM +0100, JK.Behnke@web.de wrote: > Hello, > > I noticed that running the same xenomai application against xenomai 2.6.4 > is significantly slower on start up, than it was with xenomai 2.4.10. > Calling my xenomai application 100 times by a bash script takes about > 1 sec on xenomai 2.4.10. On xenomai 2.6.4 however it takes about > 20 secs. On what hardware? What architecture? > Even if I strip down my application to the absolut minimum of xenomai > calls like this As you may know, everything is loaded on demand, so the application start time does not depend on the application size. > > main() > { >   mlockall(...); >   rt_task_shadow(...); > } > > I get the same behaviour. > > I have tested this on the same hardware (x86, atom). The only difference > is the Linux kernel (2.6.30.8 vs 3.14.17) version and the xenomai version > (2.4.10 vs 2.6.4). > > I once mistakenly linked my xenomai 2.4.10 application against libxenomai > and also got the same behaviour (slower startup). > So I suspect this has something to do with libxenomai I need to link > against, when building xenomai applications using xenomai 2.6.4. > > Is there a kind of additional setup behind the scenes in xenomai 2.6.4? The code source is available, so you can check what happens at startup and even time it. I am afraid people who care about start time with Xenomai are not numerous. -- Gilles.