Hi, colleagues, We got mail below from Ivana Hrivnacova. We had the same problem with running "Root" on MOSIX-cluster (4 PC's with RedHat7.1). I assume, that if program is using routines in shared memory, it will introduce these segm.faults. It is mentioned in description of Mosix, if I am not wrong. The Mosix Kernel reroutes only "system calls" to the "home" machine, but calls to user routines just go unnoticed. And shared memory did not migrate. ????? Andrej Kugler > > ---------- Forwarded message ---------- > Date: Thu, 13 Jun 2002 09:56:35 +0200 (CEST) > From: Ivana Hrivnacova <Ivana.Hrivnacova@cern.ch> > To: Dagmar Adamova <adamova@ujf.cas.cz> > Subject: Re: [ROOT] Using root with OpenMOSIX (fwd) > > > Tady je ten mail o MOSIXu, > > Ivana > > ============================================================== > e-mail: Ivana.Hrivnacova@cern.ch > address: Institut Physique Nucleaire, 91406 Orsay, France > phone: (33) 01 69 15 65 94 > ============================================================== > > > ---------- Forwarded message ---------- > Date: 12 Jun 2002 16:22:54 +0200 > From: Fons Rademakers <Fons.Rademakers@cern.ch> > To: Sam Waldman <waldman@HEP.Stanford.EDU> > Cc: roottalk@pcroot.cern.ch > Subject: Re: [ROOT] Using root with OpenMOSIX > > Hi Sam, > > I assume Mosix correctly migrates all depending shared libs with the > jobs? Any idea where it segv's? > > Cheers, Fons. > > > > On Tue, 2002-06-11 at 19:42, Sam Waldman wrote: > > > > Hi folks, > > > > I'm running ROOT on a 5 node redhat-7.3 cluster. We have > > installed an OpenMOSIX kernel on each of the machines, allowing > > transparent clustering across all 5 machines. The makers of OpenMOSIX > > call it "fork and forget", and for many applications we run, including > > large geant applications, it runs fine -- big jobs automatically migrate > > around the cluster to the least loaded machine. Unfortunately, every > > time mosix tries to send a root application to another machine, it > > segmentation faults. If the job is locked onto one node, even a node > > seperate from the home node, the job runs fine. > > > > Does anyone have any experience using root with MOSIX or > > OpenMOSIX? Or are there any obvious reasons for this behaviour? Any help > > will be greatly appreciated. > > > > sam waldman > -- > Org: CERN, European Laboratory for Particle Physics. > Mail: 1211 Geneve 23, Switzerland > E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248 > WWW: http://root.cern.ch/~rdm/ Fax: +41 22 7679480 > > ------------------------------------------------------------------------------------------------- Andrej Kugler, Nuclear Physics Institute, CZ 250 68 Rez, Czech Republic phone: +420-2-6617-3285 fax:+420-2-20941130 Email:kugler@ujf.cas.cz +420-2-20940220 -------------------------------------------------------------------------------------------------
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