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Categories >> Software >> Operating Systems >> RTOS >> RTOS AllOther
 
 


 

 
 Vxworks interview questions  Vxworks Interview Questions (11)
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 RTOS AllOther interview questions  RTOS AllOther Interview Questions (20)
Question
what is major concerns about any RTOS selection ?
 Question Submitted By :: Sumeet4interview
I also faced this Question!!     Rank Answer Posted By  
 
  Re: what is major concerns about any RTOS selection ?
Answer
# 1
There are two major reson to consider before selecting any RTOS

1) Interuppt latency
2) Footprint (size of the executable which is generated
after compiling)
3) Context switching time is also considered as vital
element in selection
 
Is This Answer Correct ?    33 Yes 4 No
Mohsin
 
  Re: what is major concerns about any RTOS selection ?
Answer
# 2
(1) Interrupt latency means, the time taken by the processor
to service the interrupt. So, obviously the interrupt
latency depends on how good the Interrupt Service Routine
was written

(2) Foot print is completely related to compiler and its
optimization techniques
 
Is This Answer Correct ?    17 Yes 7 No
Endachata
 
 
 
  Re: what is major concerns about any RTOS selection ?
Answer
# 3
Interrrupt Latency means the time taken by the processor to
pass the control to ISR after the interrupt is raised.
Certainly this is the hardware feature.

Footprint of the OS matters because with the same compiler
and same optimization techniques, Different OS's will have
different footprint.
So this is can be looked upon while selecting the RTOS.

RTOS can be chosen looking at various API support it
provides. Synchronization support, Scheduler algos, and
memory management of the OS.
 
Is This Answer Correct ?    15 Yes 2 No
Mujeer
 
  Re: what is major concerns about any RTOS selection ?
Answer
# 4
First thing i will look for open source RTOS, so that i can
modify it as per my application requirements. Further, it
will help in debugging software with confidence.


Context switching time is again in programmers hand(i.e.OS
porting work).
 
Is This Answer Correct ?    1 Yes 0 No
Santosh
 

 
 
 
Other RTOS AllOther Interview Questions
 
  Question Asked @ Answers
 
If two processes which shares same system memory and system clock in a distributed system, What is it called?   6
What is priority inversion ? and What is the solution ? Qualcomm 6
what is difference between IRQ and FRQ ? Bosch 4
What is the difference between Hard and Soft real-time systems ? Satyam 10
What is a Real-Time System ?   5
What is the important aspect of a real-time system ?   6
When would you choose bottom up methodology? Knowx-Innovations 5
Give an example of microkernel. Samsung 13
Describe different job scheduling in operating systems.   9
What is the difference b/n any GPOS and RTOS?Give suitable examples or characteristic of RTOS to support your answer. What changes can be done in a GPOS to make it work like a RTOS? What basic features will you support, if you have to design a RTOS? Emulogic 7
When would you choose top down methodology? CTS 3
I have been working on one thread which manage and control a couple of circular buffers. It has api for other thread to access. As the thread grows bigger and bigger, I split it as 3 to 4 threads which need to share common buffers, and also their api could be used by other threads, (not these three threads). Inside api, I also allow other threads to access these three threads' common buffers(more than one buffer). SO I have to use mutex to avoid race condition . But I found mutex will be everwhere in all the threads when they update the common buffer. I am wondering whether I could reduce mutex usage(more mutex will hure my system performance). any ideas for how to reduce mutex usage meanwhile to avoid race condition. Thanks   2
 
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