Update README
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Gregory Nutt
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@ -152,9 +152,9 @@ Status
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minimum amount of time.
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With these changes, basic SMP functionality is restored and there are no
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known issues (Configuration smp with 4 CPUs and data cache disabled). It
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is likely, however, that additional changes similar to the above will be
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required in other areas of the OS, but none such are known as of this
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known issues (Configuration 'smp' with 4 CPUs and data cache disabled).
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It is possible, however, that additional changes similar to the above will
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be required in other areas of the OS, but none such are known as of this
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writing. Insufficient stress testing has been done to prove that the
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solution is stable.
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@ -625,11 +625,6 @@ index eedf179..1db2092 100644
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SMP support. There are no known problem but the changes have not been verified
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fully (see STATUS above for 2019-02-06).
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4. I have a sense that there may be some performance issues that need to be worked
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out. I have made no measurements so perhaps that is an unfounded concern but
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you should be aware even of my unfounded concerns if you want to work with i.MX6
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SMP.
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Configurations
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==============
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@ -720,12 +715,114 @@ Configuration sub-directories
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smp
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---
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This is a configuration of testing the SMP configuration. It is
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essentially equivalent to the SMP configuration except has SMP enabled.
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essentially equivalent to the nsh configuration except has SMP enabled
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and supports apps/examples/smp.
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Sample output of the SMP test is show below (Configuration all 4 CPUs
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but with data cache disabled):
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NuttShell (NSH) NuttX-7.23
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nsh> smp
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Main[0]: Running on CPU0
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Main[0]: Initializing barrier
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Thread[1]: Started
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Main[0]: Thread 1 created
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Thread[1]: Running on CPU0
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Main[0]: Now running on CPU1
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Thread[2]: Started
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Main[0]: Thread 2 created
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Thread[2]: Running on CPU1
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Main[0]: Now running on CPU2
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Thread[3]: Started
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Main[0]: Thread 3 created
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Thread[3]: Running on CPU2
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Main[0]: Now running on CPU3
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Thread[4]: Started
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Thread[4]: Running on CPU3
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Main[0]: Thread 4 created
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Main[0]: Now running on CPU0
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Thread[5]: Started
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Thread[5]: Running on CPU0
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Main[0]: Thread 5 created
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Thread[6]: Started
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Thread[6]: Running on CPU0
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Main[0]: Thread 6 created
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Thread[7]: Started
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Thread[7]: Running on CPU0
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Main[0]: Thread 7 created
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Thread[8]: Started
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Thread[8]: Running on CPU0
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Main[0]: Thread 8 created
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Thread[2]: Now running on CPU0
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Thread[3]: Now running on CPU0
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Thread[4]: Now running on CPU0
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Thread[3]: Now running on CPU2
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Thread[3]: Now running on CPU0
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Thread[5]: Now running on CPU1
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Thread[5]: Now running on CPU0
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Thread[6]: Calling pthread_barrier_wait()
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Thread[8]: Calling pthread_barrier_wait()
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Thread[3]: Calling pthread_barrier_wait()
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Thread[5]: Calling pthread_barrier_wait()
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Thread[1]: Calling pthread_barrier_wait()
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Thread[2]: Now running on CPU2
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Thread[2]: Calling pthread_barrier_wait()
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Thread[7]: Now running on CPU3
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Thread[4]: Now running on CPU1
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Thread[4]: Calling pthread_barrier_wait()
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Thread[7]: Calling pthread_barrier_wait()
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Thread[7]: Back with ret=PTHREAD_BARRIER_SERIAL_THREAD (I AM SPECIAL)
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Thread[6]: Back with ret=0 (I am not special)
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Thread[8]: Back with ret=0 (I am not special)
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Thread[3]: Back with ret=0 (I am not special)
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Thread[5]: Back with ret=0 (I am not special)
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Thread[1]: Back with ret=0 (I am not special)
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Thread[2]: Back with ret=0 (I am not special)
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Thread[4]: Back with ret=0 (I am not special)
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Thread[7]: Now running on CPU1
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Thread[6]: Now running on CPU2
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Thread[3]: Now running on CPU1
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Thread[5]: Now running on CPU2
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Thread[1]: Now running on CPU1
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Thread[4]: Now running on CPU3
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Thread[2]: Now running on CPU0
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Thread[7]: Now running on CPU0
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Thread[6]: Now running on CPU0
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Thread[3]: Now running on CPU0
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Thread[4]: Now running on CPU0
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Thread[1]: Now running on CPU0
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Thread[5]: Now running on CPU0
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Thread[3]: Now running on CPU3
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Thread[3]: Now running on CPU0
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Thread[4]: Now running on CPU2
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Thread[3]: Done
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Thread[4]: Now running on CPU0
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Thread[4]: Done
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Thread[7]: Done
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Thread[2]: Done
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Thread[5]: Now running on CPU2
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Thread[8]: Now running on CPU1
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Thread[8]: Done
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Thread[6]: Now running on CPU3
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Thread[5]: Done
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Thread[1]: Done
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Main[0]: Now running on CPU1
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Main[0]: Thread 1 completed with result=0
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Main[0]: Thread 2 completed with result=0
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Main[0]: Thread 3 completed with result=0
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Main[0]: Thread 4 completed with result=0
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Main[0]: Thread 5 completed with result=0
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Thread[6]: Done
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Main[0]: Now running on CPU0
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Main[0]: Thread 6 completed with result=0
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Main[0]: Thread 7 completed with result=0
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Main[0]: Thread 8 completed with result=0
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nsh>
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NOTES:
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1. See the notes for the nsh configuration. Since this configuration
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is essentially the same all of those comments apply.
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2. SMP is not fully functional. See the STATUS and SMP sections above
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for detailed SMP-related issues.
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2. See the STATUS and SMP sections above for detailed SMP-related
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issues.
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