Hi Sawada,
I am relieved to hear that the performance problem was solved.
And I added a tip about PMEM namespace and partitioning in PG wiki[1].
Regards,
[1] https://wiki.postgresql.org/wiki/Persistent_Memory_for_WAL#Configure_and_verify_DAX_hugepage_faults
--
Takashi Menjo <takashi(dot)menjo(at)gmail(dot)com>