I want to say that our company is already engaged in the search for the causes 
of the problem and their solution. And also we have few experimental patches 
that increases performance for 1000 clients by several times.
In addition, I have fixed threadsafety issues and implemented per-thread cache 
for zeta values. See attached patch.

Attachment: pgbench-zipf-02v.patch
Description: Binary data

Thanks and Regards,
Alik Khilazhev
Postgres Professional:
The Russian Postgres Company
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