| Title: Latency Measurement |
| |
| Description: |
| |
| This benchmark measures the latency of selected capabilities of both the |
| nanokernel and microkernel. |
| |
| IMPORTANT: The sample output below was generated using a simulation |
| environment, and may not reflect the results that will be generated using other |
| environments (simulated or otherwise). |
| |
| -------------------------------------------------------------------------------- |
| |
| Building and Running Project: |
| |
| This microkernel project outputs to the console. It can be built and executed |
| on QEMU as follows: |
| |
| make qemu |
| |
| -------------------------------------------------------------------------------- |
| |
| Troubleshooting: |
| |
| Problems caused by out-dated project information can be addressed by |
| issuing one of the following commands then rebuilding the project: |
| |
| make clean # discard results of previous builds |
| # but keep existing configuration info |
| or |
| make pristine # discard results of previous builds |
| # and restore pre-defined configuration info |
| |
| -------------------------------------------------------------------------------- |
| |
| Sample Output: |
| |
| |-----------------------------------------------------------------------------| |
| | Nanokernel Latency Benchmark | |
| |-----------------------------------------------------------------------------| |
| | tcs = timer clock cycles: 1 tcs is N nsec | |
| |-----------------------------------------------------------------------------| |
| | 1- Measure time to switch from fiber to ISR execution | |
| | switching time is NNNN tcs = NNNNN nsec | |
| |-----------------------------------------------------------------------------| |
| | 2- Measure time to switch from ISR back to interrupted fiber | |
| | switching time is NNNN tcs = NNNNN nsec | |
| |-----------------------------------------------------------------------------| |
| | 3- Measure time from ISR to executing a different fiber (rescheduled) | |
| | switching time is NNNN tcs = NNNNN nsec | |
| |-----------------------------------------------------------------------------| |
| | 4- Measure average context switch time between fibers | |
| | Average context switch time is NNNN tcs = NNNNN nsec | |
| |-----------------------------------------------------------------------------| |
| | 5- Measure average time to lock then unlock interrupts | |
| | 5.1- When each lock and unlock is executed as a function call | |
| | Average time for lock then unlock is NNNN tcs = NNNN nsec | |
| | | |
| | 5.2- When each lock and unlock is executed as inline function call | |
| | Average time for lock then unlock is NNN tcs = NNNN nsec | |
| |-----------------------------------------------------------------------------| |
| |-----------------------------------------------------------------------------| |
| | Microkernel Latency Benchmark | |
| |-----------------------------------------------------------------------------| |
| | tcs = timer clock cycles: 1 tcs is N nsec | |
| |-----------------------------------------------------------------------------| |
| | 1- Measure time to switch from ISR to back to interrupted task | |
| | switching time is NNNN tcs = NNNNN nsec | |
| |-----------------------------------------------------------------------------| |
| | 2- Measure time from ISR to executing a different task (rescheduled) | |
| | switch time is NNNNN tcs = NNNNNN nsec | |
| |-----------------------------------------------------------------------------| |
| | 3- Measure average time to signal a sema then test that sema | |
| | Average semaphore signal time NNNNN tcs = NNNNNN nsec | |
| | Average semaphore test time NNNNN tcs = NNNNNN nsec | |
| |-----------------------------------------------------------------------------| |
| | 4- Measure average time to lock a mutex then unlock that mutex | |
| | Average time to lock the mutex NNNNN tcs = NNNNNN nsec | |
| | Average time to unlock the mutex NNNNN tcs = NNNNNN nsec | |
| |-----------------------------------------------------------------------------| |
| | 5- Measure average context switch time between tasks using (task_yield) | |
| | Average task context switch using yield NNNNN tcs = NNNNNN nsec | |
| |-----------------------------------------------------------------------------| |
| | E N D | |
| |-----------------------------------------------------------------------------| |
| =================================================================== |
| PROJECT EXECUTION SUCCESSFUL |
