Oracle Audio Technologies B31679-01 - Manual (Page 36)

28 Oracle TimesTen In-Memory Database Installation Guide
The C development tools are required if native development will be
done on the machine.
Large pages
Large pages can be enabled only if the running Linux kernel supports
large pages (also called “huge pages” in Linux community).
If large pages are supported by the kernel, there should be special files
in the
/proc directory that indicate the number and size of the large
pages.
On Linux 2.4.x systems, the /proc/sys/vm/hugetlb_pool indicates
the total size of the large pages.
On 2.6.x systems, the /proc/sys/vm/nr_hugepages file indicates the
total number of large pages.
You can change the total number and size of the large pages by changing
the contents of those files. For example, you can use:
echo "32" > /proc/sys/vm/nr_hugepages
To see the number and size of the allocated large pages use:
cat /proc/meminfo
The following output from this command would indicate that you have
16 large pages, each of the size 256MB for a total of 4GB:
HugePages_Total: 16
HugePages_Free: 16
Hugepagesize: 262144 kB
Note: Since large pages must be allocated on a contiguous memory
space, the actual large page size allocated may be smaller than
requested. Also, the large page size itself is not configurable. The value
of
Hugepagesize in /proc/meminfo indicates the system’s fixed large
page size.
You may need to change the /etc/security/limits.conf file if PAM
(Pluggable Authentication Modules) is enabled.
The OS now is ready for the large page support. To enable this feature
on TimesTen, simply set
-linuxLargePageAlignment Size_in_MB
in the daemon options file ( ttendaemon.options ).
You should specify the large page alignment size in MB, which is the
Hugepagesize value in /proc/meminfo .
Once you set up large pages, TimesTen uses as many large pages as
possible. If there are not enough pages, TimesTen uses the normal pages
after consuming all available large pages.