| From: | "Tsunakawa, Takayuki" <tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com> |
|---|---|
| To: | "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | [doc fix] Correct calculation of vm.nr_hugepages |
| Date: | 2018-02-19 07:05:47 |
| Message-ID: | 0A3221C70F24FB45833433255569204D1F8CC9B6@G01JPEXMBYT05 |
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| Lists: | pgsql-hackers |
Hello,
The current PostgreSQL documentation overestimates the number of huge pages (vm.nr_hugepages) because the calculation uses the maximum virtual address space. In practice, huge pages are only used for the anonymous shared memory segment. The attached patch fixes the documentation.
FYI, Oracle presents a shell script to calculate the number of huge pages for its shared memory segments:
https://docs.oracle.com/cd/E11882_01/server.112/e10839/appi_vlm.htm#UNXAR385
Regards
Takayuki Tsunakawa
| Attachment | Content-Type | Size |
|---|---|---|
| hugepage_size_doc.patch | application/octet-stream | 1023 bytes |
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