From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <5227222E.2030000@gmail.com> Date: Wed, 04 Sep 2013 08:06:06 -0400 From: Adam J MIME-Version: 1.0 References: <52270CC9.1090102@siemens.com> <52271128.9010401@siemens.com> <52271E8C.8070801@gmail.com> <66b86652c6224bb4db31a858f05f8ab4.squirrel@127.0.0.1> In-Reply-To: <66b86652c6224bb4db31a858f05f8ab4.squirrel@127.0.0.1> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai] unmapping and remapping /dev/rtheap List-Id: Discussions about the Xenomai project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Gilles Chanteperdrix Cc: Jan Kiszka , xenomai@xenomai.org Oops, yeah I forgot to mention that. Before running the experiments I do: sysctl -w kernel.sched_rt_runtime_us=-1 sysctl -w kernel.sched_rt_period_us=1000000000 Adam On 9/4/2013 8:03 AM, Gilles Chanteperdrix wrote: > Adam J wrote: >> I'm a researcher who's trying to use a linux system as a testbed for a >> new program sampling methodology. What I want to be able to do is take a >> checkpoint at a given point in a program and then run that checkpoint >> for a set amount of instructions repeatedly with deterministic run time. >> I am new to running programs deterministically on Linux. >> >> Currently I am running my experiments on a vanilla 3.10.10 linux system. >> I have all user-space processes disabled except for the shell I'm using >> to launch jobs. I am running my process under test with SCHED_FIFO 99 > Maybe I am stating the obvious, but have you tuned > /proc/sys/kernel/sched_rt_sched_rt_period_us > and > /proc/sys/kernel/sched_rt_runtime_us >