HugePages on server with multiple small instances and 72GB RAM?
Question:
The linux 2.6 kernel, or kswapd deamon, can get quite overworked having to
handle the large number of normal 4k pages for instances with a large SGA. Therefore, it's often recommended to use HugePages with SGA > 10G. (Problems have been seen with SGA as low as 7GB, though). The recomendations I've read goes for servers with a single instance.
I would like to know if anyone has any advice when there are multiple instances and the SGA sizes add up to 20G?
Background:
I have a linux x64 server with 72G RAM, and it is expected to get numerous databases running from the same oracle home. For now, it's not been configured with hugepages, but I would like to know if it is recommended - let's say if I have 10 databases that uses SGA to a total of 20GB. Is it recommended to use HugePages then, or is it better to use normal 4k memory pages?
I would like to know if anyone has any advice when there are multiple instances and the SGA sizes add up to 20G?
Background:
I have a linux x64 server with 72G RAM, and it is expected to get numerous databases running from the same oracle home. For now, it's not been configured with hugepages, but I would like to know if it is recommended - let's say if I have 10 databases that uses SGA to a total of 20GB. Is it recommended to use HugePages then, or is it better to use normal 4k memory pages?
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