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|System Administration Guide: Advanced Administration Oracle Solaris 10 8/11 Information Library|
Look for several identical jobs that are owned by the same user. This problem might occur because of a running script that starts a lot of background jobs without waiting for any of the jobs to finish.
Look for a process that is running with a priority that is too high. Use the ps -c command to check the CLS field, which displays the scheduling class of each process. A process executing as a real-time (RT) process can monopolize the CPU. Or, look for a timesharing (TS) process with a high nice number. A user with superuser privileges might have increased the priority of a process. The system administrator can lower the priority by using the nice command.
Look for a runaway process. A runaway process progressively uses more and more CPU time. You can identify this problem by looking at the time when the process started (STIME) and by watching the cumulation of CPU time (TIME) for a while.