zephyr

History

Allan Stephens 57de8be493 Eliminate VxMicro branding in sample projects Eliminates references to the obsolete OS name. In most cases the name is simply removed, as it isn't necessary. Change-Id: I3796f2aebe802f8c6045b7424a3e7aab4d5fb8e8 Signed-off-by: Allan Stephens <allan.stephens@windriver.com>		2016-02-05 20:14:15 -05:00
..
src	Eliminate VxMicro branding in sample projects	2016-02-05 20:14:15 -05:00
Makefile	Kbuild: Changing build parameter CONF_OVERLAY to CONF_FILE	2016-02-05 20:14:09 -05:00
README.txt	Eliminate VxMicro branding in sample projects	2016-02-05 20:14:15 -05:00
prj.vpf	Get rid of VxMicro-specific warning from VPF files	2016-02-05 20:14:15 -05:00
prj_generic.conf	First commit	2015-04-10 16:44:37 -07:00
prj_pc8253.conf	First commit	2015-04-10 16:44:37 -07:00

README.txt

Title: latency measure

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 NODE1.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