112 lines
4.6 KiB
Plaintext
112 lines
4.6 KiB
Plaintext
Title: Timing Information
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Description:
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Timing measurements for the following features of the OS.
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1. Context switch
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Time taken to compete the context switch, i.e time spent in _Swap function.
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2. Interrupt latency
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Time taken from the start of the common interrupt handler till the
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actual ISR handler being called.
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3. Tick overhead
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Time spent by the cpu in the tick handler.
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4. Thread Creation
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Time spent in creating a thread.
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5. Thread cancel
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Time taken to cancel the thread which is not yet started execution.
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So the time taken to complete the function call is measured.
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6. Thread abort
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Time taken to abort the thread which has already started execution.
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So the time measured is from the start of the function call until the
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another thread is swapped in.
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7. Thread Suspend
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The time measured is from the start of the function call until the current
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thread is suspended and another thread is swapped in.
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8. Thread Resume
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The time measured is from the start of the function call until the required
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thread is resumed by swap operation.
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9. Thread Yield
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The time measured is from the start of the function call until the higher priority
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thread is swapped in.
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10. Thread Sleep
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The time measured is from the start of the function call until the current
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thread is put on the timeout queue and another thread is swapped in.
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11. Heap Malloc
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The time to allocate heap memory in fixed size chunks. Continuously allocate
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the memory from the pool. Average time taken to complete the function call
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is measured.
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12. Heap Free
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Time to free heap memory in fixed size chunks. Continuously free
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the memory that was allocated. Average time taken to complete the function call
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is measured.
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13. Semaphore Take with context switch
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Taking a semaphore causes a thread waiting on the semaphore to be swapped in.
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Thus Time measured is the time taken from the function call till the waiting
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thread is swapped in.
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14. Semaphore Give with context switch
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Giving a semaphore causes a thread waiting on the semaphore to be swapped
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in (higher priority).
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Thus Time measured is the time taken from the function call till the waiting
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thread is swapped in.
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15. Semaphore Take without context switch
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Time taken to take the semaphore. Thus time to complete the function
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call is measured.
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16. Semaphore Give without context switch
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Time taken to give the semaphore. Thus time to complete the function
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call is measured.
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17. Mutex lock
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Time taken to lock the mutex. Thus time to complete the function
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call is measured.
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18. Mutex unlock
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Time taken to unlock the mutex. Thus time to complete the function
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call is measured.
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19. Message Queue Put with context switch
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A thread is waiting for a message to arrive. The time taken from the start
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of the function call till the waiting thread is swapped in is measured.
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20. Message Queue Put without context switch
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The time taken to complete the function call is measured.
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21. Message Queue get with context switch
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A thread has gone into waiting because the message queue is full.
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When a get occurs this thread gets free to execute. The time taken from
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the start of the function call till the waiting thread is
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swapped in is measured.
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22. Message Queue get without context switch
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The time taken to complete the function call is measured.
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23. MailBox synchronous put
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The time taken from the start of the function call till the waiting thread
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is swapped in is measured.
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24. MailBox synchronous get
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The time taken from the start of the function call till the waiting thread
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is swapped in is measured.
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25. MailBox asynchronous put
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The time taken to complete the function call is measured.
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26. MailBox get without context switch
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The time taken to complete the function call is measured.
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Building and Running Project:
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This benchmark outputs to the console. It can be built and executed
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on QEMU as follows:
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make run
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--------------------------------------------------------------------------------
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Troubleshooting:
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Problems caused by out-dated project information can be addressed by
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issuing one of the following commands then rebuilding the project:
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make clean # discard results of previous builds
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# but keep existing configuration info
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or
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make pristine # discard results of previous builds
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# and restore pre-defined configuration info
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--------------------------------------------------------------------------------
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Sample Output:
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