On 19 November 2017 at 19:52, Andres Freund <and...@anarazel.de> wrote: > On 2017-11-19 19:49:01 -0500, Tom Lane wrote: >> Andres Freund <and...@anarazel.de> writes: >> > On 2017-11-19 19:08:48 -0500, Simon Riggs wrote: >> >> Am investigating the few buildfarm failures >> >> > The tests look very sensitive to differences in tuple size due to >> > different alignment requirements. Dependant on what MAXALIGN (and some >> > others) is the number of tuples fitting on a page will differ. >> >> "Few" buildfarm failures? It's probably going to fail on every 32-bit host. >> >> TBH, I would just remove those test cases. Even if they were stable >> across platforms, they don't directly prove anything at all about >> whether the feature does what it's supposed to. >> >> (Also, scaling the results to blocksize seems unlikely to help in >> passing on different BLCKSZ configurations...) > > I think it might make sense to rewrite the tests so it doesn't output > any of the sizes, but instead just compares the size of tables with > different thresholds. That should be fairly reliable.
Thanks for your input. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services