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> -----Original Message----- > From: Testbed Support for GridPP member institutes [mailto:TB- > [log in to unmask]] On Behalf Of Elena Korolkova > > Begin forwarded message: > > > From: Rolf Seuster <[log in to unmask]> > > Date: 3 April 2012 20:24:46 GMT+01:00 > > I don't know how much swap is now requested, but personally, I regard > > a machine with 8 cores, and the size of the swap less than the size of > > the physical ram as not optimally configured. Unfortunately, we miss > > experience with machines with much more cores, like a 12 real core, 24 > hyperthreaded core. Possibly one could get away with less swap space. But > > - as I said, we miss experience with that. > > On a very practical note, I have several of these machines with 64 cores and 128GB of memory sat around doing nothing, pending (mostly) our network upgrade. If anyone from ATLAS would like to get some experience running tests on such a system, then, provided the tests don't require a lot of network bandwidth[1], I'd be very happy to give people SSH access to a machine to gather some concrete facts on. Ewan [1] For real use these 64 core boxes will want a 10Gbit network connection, and I don't have the ports available at the moment. I can, however, hook them up a 1Gbit, which should be fine for anything that doesn't involve heavy reads from the DPM.