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https://github.com/zephyrproject-rtos/zephyr
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eec6b2673d
icount is on by default for all QEMU targets where it works properly. Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
22 lines
907 B
ReStructuredText
22 lines
907 B
ReStructuredText
Scheduler Microbenchmark
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This is a scheduler microbenchmark, designed to measure minimum
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latencies (not scaling performance) of specific low level scheduling
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primitives independent of overhead from application or API
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abstractions. It works very simply: a main thread creates a "partner"
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thread at a higher priority, the partner then sleeps using
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_pend_curr_irqlock(). From this initial state:
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1. The main thread calls _unpend_first_thread()
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2. The main thread calls _ready_thread()
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3. The main thread calls k_yield()
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(the kernel switches to the partner thread)
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4. The partner thread then runs and calls _pend_curr_irqlock() again
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(the kernel switches to the main thread)
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5. The main thread returns from k_yield()
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It then iterates this many times, reporting timestamp latencies
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between each numbered step and for the whole cycle, and a running
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average for all cycles run.
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