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add io latency evaluation

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Merged Florian Fischer requested to merge aj46ezos/emper:io-latency-eval into master Jan 30, 2022
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It uses a watch thread writing to eventfd and a ReadFuture with a Callback to measure the latency between writing to the eventfd and executing the resulting IO Continuation.

The worker submitting the read request starts a busy loop after the submission to enforce that the IO-continuation is delayed on this worker.

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Source branch: io-latency-eval