My rhel 7.9 enabled 1GB hugepagesize,and in this rhel7.9,there is a postgresql 14.2 (from compile installation).
[root@localhost ~]# cat /proc/meminfo |grep -i hugep
AnonHugePages: 8192 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 1048576 kB
[root@localhost ~]# hugeadm --pool-list
Size Minimum Current Maximum Default
1073741824 0 0 0 *
[root@localhost ~]#
after I change pg parameter huge_page_size to 1048576， I can not start PostgreSQL 14.2 . the following is the error,
[pg142@localhost data]$ grep huge postgresql.conf
#huge_pages = try # on, off, or try
huge_page_size = 1048576 # zero for system default
[pg142@localhost data]$ pg_ctl start
waiting for server to start....2022-05-09 04:36:58.220 GMT [1719] LOG: invalid value for parameter "huge_page_size": 1048576
2022-05-09 04:36:58.220 GMT [1719] DETAIL: huge_page_size must be 0 on this platform.
2022-05-09 12:36:58.220 CST [1719] FATAL: configuration file "/home/pg142/data/postgresql.conf" contains errors
stopped waiting
pg_ctl: could not start server
Examine the log output.
[pg142@localhost data]$
I want to know why ？