Clusters is the elemement of benchmark configuration file which defines all clusters each configuration will be ran on. The clusters can be listed one by one, or defined as increments on scale, or both. Each cluster can be further divided into groups, usually to allow division into different roles (server-client) or configurations (smaller VM memory/thread limit) within the cluster.
This configuration defines one cluster of 2 machines.
This configuration defines three clusters of sizes 4, 8 and 12.
Size property for cluster is set by
scale element for each incerement.
This configuration defines two clusters, each contaning two groups.
size properties are required for
Name property is reqired to be unique withing the cluster.
size property of the
cluster element has to be the sum of
size properties of all groups within that cluster (after evaluation - more below), otherwise an error will occur during configuration parsing.
Scaled grouped clusters
This configuration defines three clusters of sizes 3, 9 and 15, each having three groups with equal numbers of slaves.
Scale element sets a
cluster.size property for each increment, which can be used for group naming (discouraged) and size definition.
A bit more complex example
This configuration defines a total of 7 clusters with 2 groups each, one of size 2 and two for each scale increment - 3, 5 and 7. Each scale-generated cluster will have one of the groups size set to 2 and other size set to remainder after subtraction 2 from cluster size.
scaleincrement defaults to 1
sizeproperty set by scale value only, no other change possible