cpu_hog.md

CPU Hog

This scenario is based on the arcaflow arcaflow-plugin-stressng plugin. The purpose of this scenario is to create cpu pressure on a particular node of the Kubernetes/OpenShift cluster for a time span. To enable this plugin add the pointer to the scenario input file scenarios/arcaflow/cpu-hog/input.yaml as described in the Usage section. This scenario takes a list of objects named input_list with the following properties:

• kubeconfig : string the kubeconfig needed by the deployer to deploy the sysbench plugin in the target cluster
• namespace : string the namespace where the scenario container will be deployed Note: this parameter will be automatically filled by kraken if the kubeconfig_path property is correctly set
• node_selector : key-value map the node label that will be used as nodeSelector by the pod to target a specific cluster node
• duration : string stop stress test after N seconds. One can also specify the units of time in seconds, minutes, hours, days or years with the suffix s, m, h, d or y.
• cpu_count : int the number of CPU cores to be used (0 means all)
• cpu_method : string a fine-grained control of which cpu stressors to use (ackermann, cfloat etc. see manpage for all the cpu_method options)
• cpu_load_percentage : int the CPU load by percentage

To perform several load tests in the same run simultaneously (eg. stress two or more nodes in the same run) add another item to the input_list with the same properties (and eventually different values eg. different node_selectors to schedule the pod on different nodes). To reduce (or increase) the parallelism change the value parallelism in workload.yaml file