Mengxing Liu wrote:
> Hi, Alvaro and Kevin.
>
> > Anyway, this is just my analysis.
> > So I want to hack the PG and count the conflict lists' size of transactions. That would be more accurate.
>
> In the last week, I hacked the PG to add an additional thread to count RWConflict list lengths.
> And tune the benchmark to get more conflict. But the result is still not good.
Kevin mentioned during PGCon that there's a paper by some group in
Sydney that developed a benchmark on which this scalability problem
showed up very prominently. I think your first step should be to
reproduce their results -- my recollection is that Kevin says you
already know that paper, so please dedicate some time to analyze it and
reproduce their workload.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services