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      
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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