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How can I properly adjust thread priority in pthreads on Linux and what are the key considerations?
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Adjusting Thread Priority in pthreads
In Linux, pthread offers the ability to modify thread priority. However, determining the appropriate range and understanding the thread priority descriptions can be challenging.
Scheduling Policies and Thread Priority Range
The default Linux scheduling policy is SCHED_OTHER, which lacks priority control but allows setting a "nice" level. For greater priority control, consider switching to other policies like SCHED_BATCH or real-time policies (SCHED_FIFO, SCHED_RR).
SCHED_BATCH and Thread Priority
SCHED_BATCH is suitable for cases where root privileges are unavailable. It offers a priority range of 0 to 0, but it may be insufficient for significantly increasing thread priority.
Root Privileges and Real-Time Policies
Real-time policies (SCHED_FIFO, SCHED_RR) provide more granular thread priority control. However, these policies require root privileges, and improper usage can potentially lead to system hangs.
Determining System Capabilities with chrt Tool
The chrt utility can reveal the priority range supported by the system. For instance, the command "chrt -m" displays the minimum and maximum priorities for various scheduling policies.
Cautionary Note
It is essential to use real-time policies carefully, as they can impact system stability. If you are unsure of your requirements, consider using less aggressive policies like SCHED_BATCH or adjusting "nice" levels within SCHED_OTHER.
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