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HP-UX Reference > Rrtsched(1)HP-UX 11i Version 3: February 2007 |
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NAMErtsched — execute process with real-time priority SYNOPSISrtsched -s scheduler -p priority command [arguments] rtsched [ -s scheduler ] -p priority -P pid DESCRIPTIONRtsched executes command with POSIX or HP-UX real-time priority, or changes the real-time priority of currently executing process pid. All POSIX real-time priority processes are of greater scheduling importance than processes with HP-UX real-time or HP-UX timeshare priority. All HP-UX real-time priority processes are of greater scheduling importance than HP-UX timeshare priority processes, but are of lesser importance than POSIX real-time processes. Neither POSIX nor HP-UX real-time processes are subject to degradation. POSIX real-time processes may be scheduled with one of three different POSIX real-time schedulers: SCHED_FIFO, SCHED_RR, or SCHED_RR2. See rtsched(2) for details. Rtsched is a superset of rtprio. See rtprio(1). Options
Command is not scheduled, or pid's real-time priority is not changed, if the user is not a member of a group having PRIV_RTSCHED access and is not the user with appropriate privileges. When changing the real-time priority of a currently executing process, the effective user ID of the calling process must be the user with appropriate privileges, or the real or effective user ID must match the real or saved user ID of the process to be modified. In presence of processor sets (See pset_create(2) for details), the application execution is restricted to processors in the application's processor set. The threads in different processor sets do not compete with one another for processors based on their scheduling policy and priority values. The scheduler looks only at threads assigned to a processor's processor set to choose the next thread to run. RETURN VALUErtsched returns exit status:
EXAMPLESExecute file a.out with SCHED_FIFO at a priority of 10: rtsched -s SCHED_FIFO -p 10 a.out Execute file a.out with SCHED_RTPRIO at a priority of 127 (this is synonymous to rtprio 127 a.out): rtsched -s SCHED_RTPRIO -p 127 a.out Execute file a.out with the SCHED_HPUX scheduler: rtsched -s SCHED_HPUX a.out This is useful to spawn a timeshare priority command from a real-time priority shell. Set the currently running process pid 24217 to execute with SCHED_RR2 at a priority of 20: rtsched -s SCHED_RR2 -p 20 -P 24217 Now change its priority to 10 using the same scheduler: rtsched -p 10 -P 24217 WARNINGSPriority values used by rtsched may differ from those used by other commands. For example, ps(1) displays the internal representation of priority values. |
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