> config/pgjsonb-local.dat Do you use standard "workload" configuration values? (e.g. recordcount=1000, maxscanlength=100)
Could you share ycsb output (e.g. for workload a)? I mean lines like [TOTAL_GC_TIME], Time(ms), xxx [TOTAL_GC_TIME_%], Time(%), xxx >postgresql-9.4.1212.jar Ok, you have relevant performance fixes then. Konstantin>Just simple example: consider that you have something like AppStore and there is some popular application which is bought by a lot of users. Konstantin>From DBMS point of view a lot of clients perform concurrent update of the same record. I thought YCSB updated *multiple rows* per transaction. It turns out all the default YCSB workloads update just one row per transaction. There is no batching, etc. Batch-related parameters are used at "DB initial load" time only. Konstantin>Postgres locks tuples in very inefficient way in case of high contention Thank you for the explanation. Vladimir
