Using and Administering

Task 5: Specifying Machines and Their Weights

To specify weights to associate with machines, specify the following keyword in a machine's machine stanza in the administration file:

speed = number

where number defines the weight associated with a particular machine. The higher numbers correspond with a greater weight. The default weight is 1.0.

Also, if you have in your cluster machines of differing speeds and you want LoadLeveler accounting information to be normalized for these differences, specify cpu_speed_scale=true in each machine's respective machine stanza.

For example, suppose you have a cluster of two machines, called A and B, where Machine B is three times as fast as Machine A. Machine A has speed=1.0, and Machine B has speed=3.0. Suppose a job runs for 12 CPU seconds on Machine A. The same job runs for 4 CPU seconds on Machine B. When you specify cpu_speed_scale=true, the accounting information collected on Machine B for that job shows the normalized value of 12 CPU seconds rather than the actual 4 CPU seconds.