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There seems to be some considerable imprecision in the timing of -P progress reports. Nominally each thread ought to produce 2 reports in this test, but about 10% of the time we only get one, and 1% of the time we get three, as per buildfarm results so far. Pending further investigation, treat the last case as a "pass". (I, tgl, am suspicious that this still might not be lax enough, now that it's obvious that the behavior is load-dependent; but there's not yet buildfarm evidence to confirm that suspicion.) Fabien Coelho Discussion: https://postgr.es/m/26654.1505232433@sss.pgh.pa.us