Re: PostgreSQL14.2 can not start because of huge_page_size is equal to 1048576

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От John Wiencek
Тема Re: PostgreSQL14.2 can not start because of huge_page_size is equal to 1048576
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Msg-id B3948936-8E6C-4E3D-9D58-116195708F1D@comcast.net
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Ответ на PostgreSQL14.2 can not start because of huge_page_size is equal to 1048576  (类延良 <msdnchina@163.com>)
Ответы Re:Re: PostgreSQL14.2 can not start because of huge_page_size is equal to 1048576
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Found this:


See section:    19.4.5. Linux Huge Pages

"The default behavior for huge pages in PostgreSQL is to use them when possible, with the system's default huge page size, and to fall back to normal pages on failure. To enforce the use of huge pages, you can set huge_pages to on in postgresql.conf. Note that with this setting PostgreSQL will fail to start if not enough huge pages are available.”




On May 9, 2022, at 8:56 AM, 类延良 <msdnchina@163.com> wrote:

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 ？


 

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