The customer has 752 batch servers; 209 are dedicated to run LoadLeveler jobs 24 hours a day (the central manager is excluded). The rest are used by LoadLeveler when they are not in use by their respective owners.
The LoadLeveler administrators control all the 173 dedicated machines. That means that users cannot get onto these systems without submitting a LoadLeveler job. 117 of the dedicated machines are public schedulers. The user machines are submit-only machines, and users do not have access to their root password. If a user needs root access to his or her machine, he or she is allowed alternate root access only; he or she cannot get global root access to all the machines on site. (Site administrators use a common global root password.)
This site runs over 31,000 jobs per week and about 2,800 CPU days of resource utilization. The central manager is a RISC/System 6000 model 370 with 128MB of RAM. The batch machines are generally 80 percent busy. The central manager is about 35 percent to 70 percent busy. The central manager does not run any jobs, it just manages. All of the LoadLeveler machines run one job at a time. (That is, MAX_STARTERS=1.)
This customer sees some machines in a down state occassionally. The administrator feels the CPU on these machines are too busy to get a time slice to report its state to the central manager. However, this down state does not cause any problem for this customer.
117 public schedulers are subset of our 173 dedicated machines and are listed in the admin file.