18.4.4. Linux huge pages
The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/9.6/static/kernel-resources.html
Description:
Hi,
it's a mistake in 18.4.4. Linux huge pages (also in 9.4 and 9.5
documentation). Example how to count number f huge pages says:
6490428 / 2048 (PAGE_SIZE is 2MB in this case) are roughly 3169.154 huge
pages, so you will need at least 3170 huge pages:
It's very rare that PAGE_SIZE is 2MB. It's more common situation that the
value is 4096KB. But it's not a problem.
The VmPeak should by divded not by PAGE_SIZE but by Hugepagesize listed by
cat /proc/meminfo | grep Hugepagesize.
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In most versions of Linux, the default hugepage size is 2m. Other Unix versions may have different hugepage sizes, e.g. AIX, but Linux defaults to 2m
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On Oct 21, 2016, at 11:43 AM, piotrwlodarczyk89@gmail.com wrote:
The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/9.6/static/kernel-resources.html
Description:Hi,
it's a mistake in 18.4.4. Linux huge pages (also in 9.4 and 9.5
documentation). Example how to count number f huge pages says:6490428 / 2048 (PAGE_SIZE is 2MB in this case) are roughly 3169.154 huge
pages, so you will need at least 3170 huge pages:It's very rare that PAGE_SIZE is 2MB. It's more common situation that the
value is 4096KB. But it's not a problem.The VmPeak should by divded not by PAGE_SIZE but by Hugepagesize listed by
cat /proc/meminfo | grep Hugepagesize.--
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http://www.postgresql.org/mailpref/pgsql-docs
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