Distribution policy for automatically selected hosts

For syntax of the distribution policy, see “Distributing exported resources”.

When you export hosts by specifying the resource selection statement, multiple hosts are divided among multiple consumer clusters, but each host is entirely exported to a single consumer cluster. All the job slots on a host are exported to the consumer cluster, along with all its other host-based resources including swap space and memory.

Example

Begin HostExport
RES_SELECT=type==LINUX
NHOSTS=2
DISTRIBUTION=([C1, 1] [C2, 1])
End HostExport

In this example, 2 hosts that match the resource requirements are selected, suppose they are HostA and HostB, and each has 2 job slots. All job slots on each host are exported. Resources are shared evenly among 2 clusters, each cluster gets 1/2 of the resources.

Since the hosts are automatically selected, the hosts are distributed to only one consumer cluster, so the first host, HostA, goes to Cluster1, and the second host, HostB, goes to Cluster2. Assume each host has 2 job slots for use by the consumer cluster. Cluster1 gets 2 job slots on HostA, and Cluster2 gets 2 job slots on HostB.

In this example there is an even distribution policy, but it is still possible for one consumer cluster to get more resources than the other, if the exported hosts are not all identical.