Hi, Matt -- There is the 'exclude' flag, '-x' or '--exclude', that can take a list of nodes to exclude from consideration. So it's selecting from a range, but by denoting the nodes to exclude from the range. The nodes may be specified on the command line, or denoted in a file that is referenced. For example,
#SBATCH --exclude ./exclude-avx.list This approach is recommended to our researchers for running Gaussian compiled with support for AVX2 instructions, because we do not define features to identify nodes by instruction-set. Cheers, ~ Em On Wed, Jul 14, 2021 at 12:13 PM Thompson, Matt (GSFC-610.1)[SCIENCE SYSTEMS AND APPLICATIONS INC] <matthew.thomp...@nasa.gov> wrote: > Max, > > Well, that was just an example. I also was doing the same things with like > 125 node runs. Obviously, that's beyond a rack and your chances of hitting > a down node increases! I guess I figured if I can under-specify a nodelist, > maybe I could over-specify it! > > It's possible that using the topology bits could do it, but I'm also just > a basic end-user with not too much knowledge of the system setup. This was > the first time I even tried --nodelist (with help from the admins) so I was > approaching it naively as you saw. > > Or, I suppose, is there a flag that one can pass to sbatch that gives the > user a warning? That is: > > Dear user, the allocation requested contains a node in a downed state. > This allocation will be PENDING for a while. You might want to rethink > this. > > I guess SLURM knows all the downed nodes, so maybe? (But then again, maybe > sbatch would get magnitudes slower if it had to query a database of all > nodes and do checks to see this...) > > Matt > > PS: Or I guess I could stare at Ole's cool SLURM tools and figure out a > way to have my own "job checker". Find the downed nodes, parse 'scontrol > show job 1234', and display possible/impossible jobs :D > > -- > Matt Thompson, SSAI, Ld Scientific Programmer/Analyst > NASA GSFC, Global Modeling and Assimilation Office > Code 610.1, 8800 Greenbelt Rd, Greenbelt, MD 20771 > Phone: 301-614-6712 Fax: 301-614-6246 > http://science.gsfc.nasa.gov/sed/bio/matthew.thompson > > On 7/14/21, 1:42 PM, "slurm-users on behalf of Max Voit" < > slurm-users-boun...@lists.schedmd.com on behalf of > max.voit_m...@with-eyes.net> wrote: > > On Wed, 14 Jul 2021 17:04:45 +0000 > "Thompson, Matt (GSFC-610.1)[SCIENCE SYSTEMS AND APPLICATIONS INC]" > <matthew.thomp...@nasa.gov> wrote: > > > Namely, I needed say, 20 nodes on a cluster on the same rack > > ... > > So, my question is, is there a way to say, "Please give me X nodes > > inside this specific range of nodes?" > > Is the requirement actually the nodes being in the same rack, or rather > being connected to the same switch? For the latter: If you specify a > topology.conf file you can use --switch=... , c.f. > > https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fslurm.schedmd.com%2Ftopology.html&data=04%7C01%7Cmatthew.thompson%40nasa.gov%7C3769db7ffe274ecca56a08d946eeb9cc%7C7005d45845be48ae8140d43da96dd17b%7C0%7C0%7C637618813398627878%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=nT%2FVHMkQeLZwnQq3ynNNDbvDjlmJ9e%2F6%2FyYVS89%2BMhc%3D&reserved=0 > > Best, > Max > > > -- E.M. (Em) Dragowsky, Ph.D. Research Computing -- UTech Case Western Reserve University (216) 368-0082
