Sets the CPU scheduling priority for executed processes. The available priority range depends on the selected CPU scheduling policy. For real-time scheduling policies, an integer between 1 lowest priority and 99 highest priority can be used. Example 3. Changing the priority of the mcelog service The following example uses the mcelog service. To change the priority of the mcelog service:. Display the mcelog priority set by systemd issue the following:. For more information about changing the systemd unit configuration directives refer to the Modifying Existing Unit Files chapter of the System Administrator's Guide.
Configuring the CPU usage of a service. Simply, the "Real Time" priority class is higher than "High" priority class. I don't think there's much more to it than that. Windows will sometimes boost the priority of a thread for various reasons, but it won't boost the priority of a thread into another priority class. It also won't boost the priority of threads in the real-time priority class. So a High priority thread won't get any automatic temporary boost into the Real Time priority class.
Try setting Minecraft's priority to Realtime. Trust me, it's fun. Your mouse slows down, the keys take 5 seconds to respond, and explorer. I've never suffered any problems from doing this I assume that the system would at least overheat if something was going horribly wrong, but of course, I don't really know what COULD go wrong. Perhaps having multiple cores counters any starvation of resources to IO devices etc.. There is a difference between a real-time priority thread and the real-time base priority class.
The latter applies to the entire process and without additional setting of individual thread priorities, won't cause any threads to be real-time. Doc Brown Michael Burr Michael Burr k 49 49 gold badges silver badges bronze badges. Yes, realtime threads are appropriate if you have a thread that doesn't have much to do but needs to experience good response times.
Iknow I know it's an old post but I found that book chapter really nice I found a link to the book chapter thanks to Archive. So basicly, if you have to ask, don't use it :. Eric Petroelje Eric Petroelje It's important to know what it means utmost priority is given to that thread, above all else , but if you ever find yourself asking if you should use it, you definitely should not. I guess you can use it and see what happens then you'll learn but I feel your discouraging learning — fifamaniac Similarly, real-time is also a thread priority level.
So, a process has a: Base process priority class. Individual thread priorities , offsets of the base priority class. Matt Uwe Keim You're right that changing the process priority class does not affect CPU utilization, so long as there is not contention for the CPU.
Instead, a security privilege protects against setting 'real time' to prevent haphazard use. Use the GetPriorityClass function to determine the current priority class of a process and the SetPriorityClass function to change the priority class of a process. This prevents the threads of this process, which do not have high priority, from interfering with higher priority threads.
If a thread runs at the highest priority level for extended periods, other threads in the system will not get processor time. If several threads are set at high priority at the same time, the threads lose their effectiveness.
The high-priority class should be reserved for threads that must respond to time-critical events. If your application performs one task that requires the high-priority class while the rest of its tasks are normal priority, use SetPriorityClass to raise the priority class of the application temporarily; then reduce it after the time-critical task has been completed.
Another strategy is to create a high-priority process that has all of its threads blocked most of the time, awakening threads only when critical tasks are needed. The important point is that a high-priority thread should execute for a brief time, and only when it has time-critical work to perform.
This class can be appropriate for applications that "talk" directly to hardware or that perform brief tasks that should have limited interruptions. This means that the thread priority is the same as the process priority class.
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