[I'll try that again, without sending by accident first!] On 12/08/16 09:31, Christopher Samuel wrote:
> Yup, but Diego was asking about when SMT/HT is enabled and those thread > units are visible. We tested this briefly in 2013 and whilst it worked we didn't stick with it because of interactions with our fixed quota system (which was hard enough for people without trying to explain that some systems would burn their time twice as fast). The CR_ONE_TASK_PER_CORE is a hold over from then, it means that if you've got HT/SMT enabled you'll get one MPI rank (Slurm task) per physical core and that can then use threads to utilise the hardware thread units. Without it you'll get a rank per thread, which may not be useful to your code. All the best! Chris -- Christopher Samuel Senior Systems Administrator VLSCI - Victorian Life Sciences Computation Initiative Email: [email protected] Phone: +61 (0)3 903 55545 http://www.vlsci.org.au/ http://twitter.com/vlsci
