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Resource Managers

This section contains information on the configuration required by the supported resource managers by CEEMS.

SLURM​

Slurm collector in the CEEMS exporter relies on the job accounting information (like CPU time and memory usage) in the cgroups that SLURM create for each job to estimate the energy and emissions for a given job. However, depending on the cgroups version and SLURM configuration, this accounting information might not be available. The following section will give guidelines on how to configure SLURM to ensure that this accounting information is always available.

Starting from SLURM 22.05 SLURM supports both cgroups v1 and v2. When cgroups v1 is being used, SLURM might not contain accounting information in the cgroups.

cgroups v1​

The following configuration will enable necessary cgroups controllers and provide the accounting information of the jobs when cgroups v1 is used.

As stated in the cgroups docs of SLURM, cgroups plugin can be controlled by the configuration in this file. An example config is also provided which should be a good starting point.

Along the cgroups.conf file, certain configuration parameters are required in the slurm.conf file as well. This is provided in the SLURM docs as well.

IMPORTANT

Although JobAcctGatherType=jobacct_gather/cgroup is presented as optional configuration parameter, it must be used to get the accounting information on CPU usage. Without this configuration parameter, CPU time of the job will not be available in the job's cgroups

Besides the above configuration, SelectTypeParameters must be configured to set core or CPU and memory as consumable resources. This is highlighted in the documentation of ConstrainRAMSpace configuration parameter in cgroups.conf docs.

In conclusion, here are the excerpts of configuration needed:


# cgroups.conf

ConstrainCores=yes
ConstrainDevices=yes
ConstrainRAMSpace=yes
ConstrainSwapSpace=yes

# slurm.conf

ProctrackType=proctrack/cgroup
TaskPlugin=task/cgroup,task/affinity
JobAcctGatherType=jobacct_gather/cgroup 
SelectType=select/con_tres
SelectTypeParameters=CR_CPU_Memory # or CR_Core_Memory

cgroups v2​

In the case of cgroups v2, SLURM should create a proper cgroup for every job without any special configuration. However, the configuration presented for cgroups v1 is applicable for cgroups v2 and it is advised to use that configuration for cgroups v2 as well.

Libvirt​

The libvirt collector is meant to be used for Openstack clusters. There is no special configuration needed as Openstack will take care of confirguring libvirt and QEMU to enable all relevant cgroup controllers.