RE: Hugepages - benefits / drawbacks
- From: Yong Huang <yong321@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Mon, 6 Oct 2008 10:43:34 -0700 (PDT)
I agree with Mark. Whenever possible, use huge pages. The only thing I can
think of is that, on some architectures, huge page page size is huge!,
literally.
This is Itanium:
$ uname -i
ia64
$ grep -i hugepage /proc/meminfo
HugePages_Total: 0
HugePages_Free: 0
Hugepagesize: 262144 kB
The previous DBA setting up the server and database didn't use huge pages. I
don't know if he was unaware of it or was afraid of the big page size.
Generally, huge pages should use 2M page size. On these Itanium boxes, we
frequently see memory shortage, and have to kill MMON and/or PZ9? processes to
temporarily solve the problem.
Yong Huang
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