On Thu, Apr 10, 2014 at 01:35:15PM +0000, Lux, Jim (337C) wrote: > > > On 4/9/14 3:54 PM, "Piotr Król" <[email protected]> wrote: > > >3. I'm not electrical engineer but I wonder if there could be problem > >with powering up 32/64 nodes at once. There are no wattage > >characterization data for this board right now, but I saw some > >informations that this board should be sub-10W. > > > That depends more on your power supplies. Do these boards have on board > DC/DC converters? Or do they run off a standard PC power supply with +5, > +12/-12, etc. > > Bear in mind that 100 wall warts is a packaging challenge. >
Yes, board contain TI TPS51220 power controller with +5V and +3.3V output. 12V AC power supply is delivered with Jetson DevKit. > > > >4. Theoretical max for this platform is 326 SP GFLOPS, I was able to > >confirm that DP/SP ratio is 1/24 so theoretical max for DP is 13 GFLOPS. > >Can someone elaborate or point me to documentation how hard will be to > >utilize this power assuming CUDA and MPI usage. > > > >5. Operating system reside on eMMC, are there any reasons to switch to > >SD card or SSD disk (there is a SATA port on board) ? > > > What is your node-node interconnect fabric? GigE and a multi port switch? > For your task, is it going to be communication bound or compute bound? There is GbE on board, so I assume (if I will choose this board) that GbE switch would be best choice. I don't know exact algorithm profile but some evidence show that it would be more compute bound. > > If you don't know.. Build a small cluster, use commodity ethernet as the > interconnect, and give it a try. > > You can learn a whole lot from building a 5-10 node cluster. Lots of > things like packaging, interconnects, cables, etc. > For sure I would like to run some microbenchmarking, unfortunately I don't have code. I run some MPICH examples on my two old laptops and workstation, so I have some basics, but right now trying to choose hardware without knowing much about workload. > Just crummy enough that I fought network problems for a couple of weeks > (not realizing they were network problems.. Small embedded computers often > don't have good diagnostic capability.. Hmm what can I figure out using > busybox, only?) New boards like Jetson or BeagleBone usually came with some modified Debian/Ubuntu distro so planty of packages are already available. Thank you for your comments Jim. Regards, Piotr Król _______________________________________________ Beowulf mailing list, [email protected] sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
