Oracle RAC on RedHat Linux Best Practice guide and ... - OpenMPE
Oracle RAC on RedHat Linux Best Practice guide and ... - OpenMPE
Oracle RAC on RedHat Linux Best Practice guide and ... - OpenMPE
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Bigpages/Hugetlb<br />
•Bigpages (RH 2.1) are called Hugetlb in RH3<br />
•Pages are not swapable. This means that the SGA still in memory.<br />
•Hugetlb is a backport from the kernel 2.6<br />
•The pages are pre-allocated. that amount of physical memory can be used <strong>on</strong>ly<br />
through<br />
•hugetlbfs or shm allocated with SHM_HUGETLB.<br />
•Add “bigpages=xxxxMB” to the kernel boot line in grub.c<strong>on</strong>f or lilo.c<strong>on</strong>f (<strong>on</strong>ly<br />
with RH 2.1).<br />
•echo the values to '/proc/sys/vm/hugetlb_pool' or Update the '/etc/sysctl.c<strong>on</strong>f'.<br />
The value are in MB, <strong>and</strong> it allocates several 2MB pages.<br />
•Values are viewable using '/proc/meminfo':<br />
•Hugepages_Total: 500<br />
•Hugepages_Free: 500<br />
•Hugepagesize: 2048K<br />
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