RE: Delaying/avoiding BTreeTupleGetNAtts() call within _bt_compare()

>
> The interesting thing now is the role of the "negative infinity test"
> patch (the 0003-* patch) in all of this. I suspect that it may not be helping us
> much here. I wonder, could you test the following configurations to settle
> this question?
>
> * <master> with 30 clients (i.e. repeat the test that you reported on most
> recently)
>
> * <v2-0001+2+3> with 30 clients (i.e. repeat the test that you reported got us
> that nice ~8.6% increase in TPS)
>
> * <v2-0001+2> with 30 clients -- a new test, to see if performance is at all
> helped by the "negative infinity test" patch (the 0003-* patch).
>
> It seems like a good idea to repeat the other two tests as part of performing
> this third test, out of general paranoia. Intel seem to roll out a microcode
> update for a spectre-like security issue about every other day.
>

I ran all the tests on two different machines, several times for 1 hour each time. I'm still having a hard time getting reliable results for the 30 clients case though. I'm pretty certain the patches bring a performance benefit, but how high exactly is difficult to say. As for applying only patch 1+2 or all three patches - I found no significant difference between these two cases. It looks like all the performance benefit is in the first two patches.

-Floris