I want to compare two RTOS (e.g. -> Keil-RTX ,Ucos-iii and freertos), but I do not know on what parameters I need to compare them for e.g. Memory footprint, certified etc.
On which points do we compare RTOS ?
What are the Parameters on which RTOS are compared?
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You need to compare them on the parameters that are important to your application and meeting its requirements. Those may include for example:
The possible parameters are many, and only you can determine what is useful and important to your project.
I suggest selecting about five parameters important to your project, and then analysing each option using the Kepner-Tregoe method. For each parameter you assign a weight based on its relative importance, you score each solution against each parameter, and then you sum the score x weight for an over all score. The method takes some of the subjectivity out of selection and perhaps importantly provides evidence of your decision making process when you have to justify it to your boss.