Hi Sistemas,
I could be mistaken, but I don't think there is a way to require jobs on
the 3GB nodes to request more than 2GB!
https://slurm.schedmd.com/slurm.conf.html states this: "Note that if a job
allocation request can not be satisfied using the nodes with the lowest
weight, the set of nodes with the next lowest weight is added to the set
of nodes under consideration for use (repeat as needed for higher weight
values)."
I read that to mean "if there are only 3GB nodes available, jobs will be
run there reguardless of the memory needed." We had a similar request but
were unable to find a solution (and, ultimately the particular user is
happier to not have idle machines when there's work to be done!).
If I'm misunderstanding, I'd love to know!
HTH,
Jim
On Thu, 21 Nov 2019, Sistemas NLHPC wrote:
Hi all,
Currently we have two types of nodes, one with 3GB and another with 2GB of
RAM, it is required that in nodes of 3 GB it is not allowed to execute
tasks with less than 2GB, to avoid underutilization of resources.
This, because we have nodes that can fulfill the condition of executing
tasks with 2GB or less.
I try in the nodes configuration with the option "Weight".I send multiples
jobs but slurm not asigned by "Weight", it's arbitrary in the order how
send jobs. Some configuration and logs:
slurm.conf
NodeName=DEFAULT RealMemory=3007 Features=3007MB Weight=500 State=idle
Sockets=2 CoresPerSocket=1
NodeName=devcn050
NodeName=DEFAULT RealMemory=3007 Features=3007MB Weight=100 State=idle
Sockets=2 CoresPerSocket=1
NodeName=devcn002
NodeName=DEFAULT RealMemory=2000 Features=2000MB Weight=1 State=idle
Sockets=2 CoresPerSocket=1
NodeName=devcn001
Extra information, I see that slurm assing Weight in the node.
# sinfo -N -l
NODELIST NODES PARTITION STATE CPUS S:C:T MEMORY TMP_DISK WEIGHT
AVAIL_FE REASON
devcn001 1 slims* idle 2
2:1:1 2000 0 1 2000MB none
devcn002 1 slims* idle 2
2:1:1 3007 0 100 3007MB none
devcn050 1 slims* idle 2
2:1:1 3007 0 500 3007MB none
I test other settings, such as the TRESWeigths parameter with no results,
for example:
NodeName=devcn001 TRESWeights="CPU=2.0,Mem=2000MB"
Too PriorityType=priority/multifactor plugin is also activated and
deactivated to test, but in all these cases it does not work.
Thanks in advance.
Regards.
James E. Prewett j...@prewett.org downl...@hpc.unm.edu
Systems Team Leader LoGS: http://www.hpc.unm.edu/~download/LoGS/
Designated Security Officer OpenPGP key: pub 1024D/31816D93
HPC Systems Engineer III UNM HPC 505.277.8210
