R is single threaded. On Thu, 8 Oct 2020, 07:44 Diego Zuccato, <diego.zucc...@unibo.it> wrote:
> Il 08/10/20 08:19, David Bellot ha scritto: > > > good spot. At least, scontrol show job is now saying that each job only > > requires one "CPU", so it seems all the cores are treated the same way > now. > > Though I still have the problem of not using more than half the cores. > > So I suppose it might be due to the way I submit (batchtools in this > > case) the jobs. > Maybe R is generating single-threaded code? In that case, only a single > process can run on a given core at a time (processes does not share > memory map, threads do, and on Intel CPUs there's a single MMU per core, > not one per thread as in some AMDs). > > -- > Diego Zuccato > DIFA - Dip. di Fisica e Astronomia > Servizi Informatici > Alma Mater Studiorum - Università di Bologna > V.le Berti-Pichat 6/2 - 40127 Bologna - Italy > tel.: +39 051 20 95786 > >
