Ah-hah, I've sussed it. The faulty assumption can actually be stated
as: "all the executions, except maybe the first, will take approximately
the same amount of time". The failing test case I've been looking at
is one where the system decides to use a "batched" hash join, and in
this plan type some iterations take much longer than others. (The
apparent dependence on targetlist width is now easy to understand,
because that affects the estimated hashtable size and hence the decision
whether batching is needed. I'm not sure why I don't see the effect
when running the identical case on my other machine, but since the
other one is a 64-bit machine its space calculations are probably a
bit different.)
I added some printf's to instrument.c to print out the actual time
measurements for each sample, as well as the calculations in
InstrEndLoop. Attached are the printouts that occurred for the HashJoin
node. The thing that is killing the extrapolation is of course the very
large time for iteration 2, which the extrapolation includes in its
average. But there's well over 10:1 variation in the later samples
as well.
On reflection it's easy to imagine other cases where some iterations
take much longer than others in a not-very-predictable way. For
instance, a join where only a subset of the outer tuples have a match
is going to act that way. I don't think there's any good way that we
can be sure we have a representative sample of executions, and so I'm
afraid this approach to sampling EXPLAIN ANALYZE is a failure.
I propose we revert this patch and think about an interrupt-driven
sampling method instead.
regards, tom lane
401489a0 1: 331616 usec in iter 1
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401489a0 1: 14 usec in iter 6291
401489a0 1: 13 usec in iter 6312
401489a0 1: 16 usec in iter 6331
401489a0 1: 14 usec in iter 6358
401489a0 1: 53 usec in iter 6359
401489a0 1: 15 usec in iter 6368
401489a0 1: 14 usec in iter 6373
401489a0 1: 13 usec in iter 6391
401489a0 1: 15 usec in iter 6411
401489a0 1: 15 usec in iter 6432
401489a0 1: 15 usec in iter 6454
401489a0 1: 15 usec in iter 6476
401489a0 1: 15 usec in iter 6508
401489a0 1: 15 usec in iter 6545
401489a0 1: 14 usec in iter 6564
401489a0 1: 15 usec in iter 6581
401489a0 1: 15 usec in iter 6611
401489a0 1: 14 usec in iter 6641
401489a0 1: 14 usec in iter 6661
401489a0 1: 15 usec in iter 6680
401489a0 1: 16 usec in iter 6700
401489a0 1: 15 usec in iter 6728
401489a0 1: 14 usec in iter 6738
401489a0 1: 15 usec in iter 6758
401489a0 1: 14 usec in iter 6777
401489a0 1: 15 usec in iter 6782
401489a0 1: 15 usec in iter 6784
401489a0 1: 15 usec in iter 6799
401489a0 1: 15 usec in iter 6803
401489a0 1: 16 usec in iter 6817
401489a0 1: 15 usec in iter 6831
401489a0 1: 14 usec in iter 6840
401489a0 1: 15 usec in iter 6861
401489a0 1: 14 usec in iter 6893
401489a0 1: 15 usec in iter 6911
401489a0 1: 14 usec in iter 6935
401489a0 1: 16 usec in iter 6950
401489a0 1: 15 usec in iter 6976
401489a0 1: 54 usec in iter 6987
401489a0 1: 16 usec in iter 6989
401489a0 1: 15 usec in iter 7020
401489a0 1: 14 usec in iter 7043
401489a0 1: 15 usec in iter 7065
401489a0 1: 14 usec in iter 7097
401489a0 1: 14 usec in iter 7110
401489a0 1: 16 usec in iter 7117
401489a0 1: 15 usec in iter 7126
401489a0 1: 15 usec in iter 7142
401489a0 1: 14 usec in iter 7153
401489a0 1: 14 usec in iter 7157
401489a0 1: 15 usec in iter 7160
401489a0 1: 15 usec in iter 7187
401489a0 1: 15 usec in iter 7223
401489a0 1: 15 usec in iter 7251
401489a0 1: 15 usec in iter 7271
401489a0 1: 15 usec in iter 7277
401489a0 1: 15 usec in iter 7298
401489a0 1: 14 usec in iter 7301
401489a0 1: 15 usec in iter 7334
401489a0 1: 16 usec in iter 7359
401489a0 1: 15 usec in iter 7378
401489a0 1: 15 usec in iter 7404
401489a0 1: 17 usec in iter 7417
401489a0 1: 17 usec in iter 7420
401489a0 1: 15 usec in iter 7431
401489a0 1: 16 usec in iter 7437
401489a0 1: 16 usec in iter 7451
401489a0 1: 16 usec in iter 7478
401489a0 1: 15 usec in iter 7502
401489a0 1: 15 usec in iter 7503
401489a0 1: 14 usec in iter 7535
401489a0 1: 15 usec in iter 7556
401489a0 1: 15 usec in iter 7558
401489a0 1: 52 usec in iter 7578
401489a0 1: 16 usec in iter 7583
401489a0 1: 13 usec in iter 7596
401489a0 1: 15 usec in iter 7618
401489a0 1: 14 usec in iter 7623
401489a0 1: 16 usec in iter 7624
401489a0 1: 15 usec in iter 7626
401489a0 1: 15 usec in iter 7636
401489a0 1: 16 usec in iter 7638
401489a0 1: 16 usec in iter 7661
401489a0 1: 16 usec in iter 7690
401489a0 1: 14 usec in iter 7716
401489a0 1: 16 usec in iter 7739
401489a0 1: 15 usec in iter 7767
401489a0 1: 15 usec in iter 7776
401489a0 1: 15 usec in iter 7815
401489a0 1: 16 usec in iter 7844
401489a0 1: 15 usec in iter 7875
401489a0 1: 15 usec in iter 7891
401489a0 1: 14 usec in iter 7893
401489a0 1: 14 usec in iter 7930
401489a0 1: 15 usec in iter 7937
401489a0 1: 14 usec in iter 7975
401489a0 1: 16 usec in iter 8001
401489a0 1: 14 usec in iter 8039
401489a0 1: 14 usec in iter 8044
401489a0 1: 15 usec in iter 8054
401489a0 1: 15 usec in iter 8080
401489a0 1: 15 usec in iter 8113
401489a0 1: 16 usec in iter 8120
401489a0 1: 15 usec in iter 8159
401489a0 1: 15 usec in iter 8174
401489a0 1: 16 usec in iter 8210
401489a0 1: 14 usec in iter 8226
401489a0 1: 55 usec in iter 8261
401489a0 1: 16 usec in iter 8291
401489a0 1: 15 usec in iter 8319
401489a0 1: 15 usec in iter 8322
401489a0 1: 14 usec in iter 8348
401489a0 1: 14 usec in iter 8359
401489a0 1: 14 usec in iter 8375
401489a0 1: 15 usec in iter 8401
401489a0 1: 15 usec in iter 8422
401489a0 1: 16 usec in iter 8437
401489a0 1: 15 usec in iter 8457
401489a0 1: 15 usec in iter 8485
401489a0 1: 14 usec in iter 8511
401489a0 1: 15 usec in iter 8512
401489a0 1: 16 usec in iter 8536
401489a0 1: 15 usec in iter 8540
401489a0 1: 15 usec in iter 8570
401489a0 1: 15 usec in iter 8609
401489a0 1: 15 usec in iter 8637
401489a0 1: 15 usec in iter 8648
401489a0 1: 15 usec in iter 8670
401489a0 1: 14 usec in iter 8673
401489a0 1: 16 usec in iter 8714
401489a0 1: 15 usec in iter 8729
401489a0 1: 14 usec in iter 8750
401489a0 1: 15 usec in iter 8787
401489a0 1: 14 usec in iter 8803
401489a0 1: 16 usec in iter 8816
401489a0 1: 15 usec in iter 8838
401489a0 1: 14 usec in iter 8843
401489a0 1: 15 usec in iter 8844
401489a0 1: 16 usec in iter 8865
401489a0 1: 17 usec in iter 8870
401489a0 1: 16 usec in iter 8879
401489a0 1: 16 usec in iter 8896
401489a0 1: 15 usec in iter 8937
401489a0 1: 15 usec in iter 8949
401489a0 1: 15 usec in iter 8960
401489a0 1: 15 usec in iter 8994
401489a0 1: 16 usec in iter 9027
401489a0 1: 17 usec in iter 9040
401489a0 1: 15 usec in iter 9046
401489a0 1: 15 usec in iter 9050
401489a0 1: 14 usec in iter 9057
401489a0 1: 16 usec in iter 9058
401489a0 1: 14 usec in iter 9075
401489a0 1: 15 usec in iter 9076
401489a0 1: 16 usec in iter 9099
401489a0 1: 14 usec in iter 9139
401489a0 1: 15 usec in iter 9158
401489a0 1: 15 usec in iter 9186
401489a0 1: 14 usec in iter 9212
401489a0 1: 15 usec in iter 9238
401489a0 1: 16 usec in iter 9269
401489a0 1: 17 usec in iter 9275
401489a0 1: 14 usec in iter 9298
401489a0 1: 16 usec in iter 9312
401489a0 1: 14 usec in iter 9325
401489a0 1: 15 usec in iter 9345
401489a0 1: 16 usec in iter 9362
401489a0 1: 16 usec in iter 9382
401489a0 1: 16 usec in iter 9387
401489a0 1: 15 usec in iter 9424
401489a0 1: 52 usec in iter 9435
401489a0 1: 15 usec in iter 9438
401489a0 1: 15 usec in iter 9481
401489a0 1: 15 usec in iter 9491
401489a0 1: 15 usec in iter 9499
401489a0 1: 16 usec in iter 9535
401489a0 1: 15 usec in iter 9554
401489a0 1: 14 usec in iter 9561
401489a0 1: 14 usec in iter 9576
401489a0 1: 15 usec in iter 9614
401489a0 1: 15 usec in iter 9640
401489a0 1: 14 usec in iter 9668
401489a0 1: 15 usec in iter 9700
401489a0 1: 16 usec in iter 9705
401489a0 1: 15 usec in iter 9729
401489a0 1: 15 usec in iter 9738
401489a0 1: 15 usec in iter 9777
401489a0 1: 15 usec in iter 9816
401489a0 1: 16 usec in iter 9822
401489a0 1: 15 usec in iter 9828
401489a0 1: 17 usec in iter 9870
401489a0 1: 15 usec in iter 9911
401489a0 1: 15 usec in iter 9916
401489a0 1: 15 usec in iter 9956
401489a0 1: 15 usec in iter 9991
401489a0 1: raw totaltime = 0.462843
401489a0 1: per_iter = 0.00017897, SampleOverhead = 3.29e-06
401489a0 1: adj totaltime = 2.12368
401489a0 1: sampling = 0
401489a0 1: starttime = 0/000000
401489a0 1: counter = 0/462843
401489a0 1: firsttuple = 0.331616
401489a0 1: tuplecount = 10000
401489a0 1: itercount = 10001
401489a0 1: samplecount = 721
401489a0 1: nextsample = 10018.7
401489a0 1: startup = 0.331616
401489a0 1: total = 2.12368
401489a0 1: ntuples = 10000
---------------------------(end of broadcast)---------------------------
TIP 2: Don't 'kill -9' the postmaster
