![]() The recommendation of 10 to 100 probably relates to what is adequate for most systems the aim being to be only as fast as necessary.īy spending more time in the scheduler than necessary, greater scheduling latency and jitter may occur for tasks that are scheduled on events other than timers or delays. A faster processor will be able to cope with a faster tick, but there is no benefit to running a faster tick than your applications needs as it it eats CPU time that could be used for useful work. The actual scheduling overhead will depend of course on the processor speed. In the extreme case the tick rate could be so high that you are always in the scheduler and never actually running tasks! The scheduler runs on every tick, so if for example the scheduler take 10 microseconds to run and a tick occurs every 10ms, the scheduling overhead in the absence of any other scheduling events is 0.1%, if however the tick occurs every 100us, the overhead is 10%. I am hoping the answer is not entirely empirically based! I think the intended benefit during development was to stabilise the user interface. #Tick rate golf it softwareUltimately, I am trying to determine if our software is running with too high a tick rate or how close it is to some threshold. However in our case all tasks have a different priority so I do not think this is (as?) applicable. I presume eventually this intended speeding up by increasing the tick rate would become negative as the Kernel consumes most of the processor time. ![]() This is used to test the RTOS kernel and is higher than would normally be required." It does go on to say that tasks of equal priority will switch often - this would lead to the kernel occupying a lot of the processing time which would be negative. ![]() Fair enough but, I am unclear on what are the detectable downsides as the tick rate increases.įor example, the freeRTOS documentation states "The RTOS demo applications all use a tick rate of 1000Hz. It seems common to suggest the use of interrupts with lower tick rates. In our case we would be ensuring that the user interface is addressed over some less important maintenance tasks.įrom what I can see the consensus is to recommend against setting the tick rate in any RTOS "too" high due to "overhead". We have 8 Tasks (plus interrupts) running with different priorities so I would assume the higher tick rate means we are switching in the highest priority task faster. #Tick rate golf it manualThere is no detail in the ucos manual (I can see) explaining why this is the recommended range. While investigating another issue I noticed this setting and flagged it as an anomaly. This is outside the recommended setting of 10 to 100. ![]() We are running with ucos-ii with a tick rate of 10000 (OS_TICKS_PER_SEC=10000). To prevent tick bites while golfing, the Centers for Disease Control and Prevention recommends that people use insect repellent that contains between 20 and 30 percent DEET, look for ticks on their body, take a shower as soon as they get back from golfing and put clothing in the dryer on high heat.I would be grateful if someone could offer an explanation of the effects of too high a tick rate in a RTOS or direct me to a resource that explains it clearly? The study was presented this week at the American Public Health Association meeting in New Orleans. Golfers could be targeted as a group that should receive information about tick-bite prevention, he said. People who'd had Lyme disease were no more likely to practice tick-prevention behaviors than those who'd never had the disease.īecause the study was small, more research is needed to see how common tick-prevention behaviors are among golfers, Owens said. Still, about a third of the golfers said they did not check themselves for ticks after golfing, and 72 percent did not use insect repellent while golfing, the study found. Nearly three-quarters of the golfers said they had ever found a tick on themselves after golfing, and 24 percent said they had been diagnosed with Lyme disease in the past - much higher than the rate in the general population in that area, which was 0.2 percent. In a small study, Owens and his colleagues surveyed 29 golfers at a course in Orange County, New York, where Lyme disease (an infection carried by certain ticks) is native. Moreover, golfers may not always take the proper precautions to avoid bites. ![]()
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