Thank you for your answer. Brainstorm can run. Charles -------------- > Message du 13/05/11 12:20 > De : "Mathew Maher" > A : "Charles ELSAESSER WebmailOrange" > Copie à : [log in to unmask] > Objet : RE: MRG / Realtime with SL6 > > Hello Charles, > > MRG is a redhat product for Messaging/Realtime/Grid. They've packaged all this together for use with financial applications, but its only the realtime bit which has most use for scientific applications (possibly messaging). > > SL5 distros are here: > http://glitesoft.cern.ch/cern/mrg/slc5X/i386/RPMS/repoview/mrg-realtime.group.html > > We manually patched CentOS 5 with the realtime kernel (i.e. without this RPM) and did some speed trials. Generally, it works very well, although not 100% deterministic/guaranteed. > > The trial machine was a dual Xeon X5550 2.66GHz (8 CPU cores). Without the RT kernel, we averaged 1ms thread wakeup/latency. With the RT kernel, this dropped to typical 5uS latency, but with occasional 'spikes' up to 60uS. I suspect these spikes are due to the processors NMI/SSI interrupts kicking in, which there is little the kernel can do about. > > The real killer test was running again with Hyperthreading enabled. This gives a total 16 virtual CPU's. Without RT, latency was 1.04mS. With RT this dropped to 8uS average, but spiking up to 134uS. > > Mat > > -----Original Message----- > From: Charles ELSAESSER WebmailOrange [mailto:[log in to unmask]] > Sent: 13 May 2011 11:04 > To: Mathew Maher > Cc: [log in to unmask] > Subject: re: MRG / Realtime with SL6 > > Bonjour, > > It would have been nice and usefull > if you had given links to packages, docs, patches for kernel-rt (et al) packages available for SLXXX if you know them. > > What does MRG stands for? > > Thank you. > > Charles > > -------------- > > Message du 13/05/11 10:20 > > De : "Mathew Maher" > > A : [log in to unmask] > > Copie à : > > Objet : MRG / Realtime with SL6 > > > > Hi Guys, > > Has anyone attempted to patch SL6 into realtime yet? > > > > I'm specifically referring to the kernel-rt (et al) packages available > > ... > > This e-mail and any attachments may contain confidential and > privileged information. If you are not the intended recipient, > please notify the sender immediately by return e-mail, delete this > e-mail and destroy any copies. Any dissemination or use of this > information by a person other than the intended recipient is > unauthorized and may be illegal. >