[rtl] RTLinux V1 -vs- RTAI Benchmark

[Pierre Cloutier <pcloutier@sympatico.ca>]

I ran a simple test to measure the time required to perform 120,000 task
switches:

// Both tasks A and B were initialised for FPU, B's priority < A's
TaskA()
{
for(i=0;i<60000;i++) rt_task_resume(B);// do nothing else
}

TaskB()
{
for(;;) rt_task_suspend(B);// do nothing else
}

Using a 233 MHz MMX processor I get the following elapsed times:

    RTLinux V1    .753 second
    RTAI               .303 second

Can someone explain why RTAI is so much faster despite the SMP overhead?



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