Profiling Results

• System Call Overheads
  • Thread Library Function Calls
    Also, since thread library function themselves calls functions of the scheduler API, these overheads have a meaning only when we define a scheduler. Therefore, for the purpose of measurement of kernel overheads we also define a Null Scheduler where every required scheduler API function call has an empty body.
    

    Function Call	Null Scheduler
    	CPU Cycles
    thread_lib_init	1765
    thread_create	866
    thread_suspend	83
    thread_resume	73
    schedule	126

    
    

  • Semaphore Library Function Calls
    Since, Semaphore Library also calls functions of the scheduler, it is also profiled for the null scheduler.
    
    

    Function Call	CPU Cycles
    sema_wait 11.1	70
    sema_signal	67

• Context Switch Overheads

  Function Call	Null Scheduler
  	CPU Cycles
  CPU_Context_Switch	250
  Thread Context Switch	19506