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DB2 LUW should support 1GB pages on Linux x64 platform
When using VMWare as Host System for (RH) Linux we are able to configure 1GB Pages like:
sched.mem.lpage.enable1GPage = "TRUE"
On the other hand DB2 on Linux Redhat Guest System right now does only support huge (2MB) pages per IBM DB2 documentation for
· Operating system: AIX, Linux®, Windows Server
· Default: NULL, Values: Use * to denote all applicable memory regions that should use large page memory, or a comma-separated list of specific memory regions that should use large page memory. Available regions vary by operating system.
· Db2 uses the term "large pages" generically, whereas operating systems use the terms "large" and "huge" to reference both specific and various larger hardware-dependent page sizes. A "large" or "huge" OS page size is not the same size on all OS/hardware platforms, and these terms may refer to multiple page sizes on a given OS/hardware platform.
· The DB setting applies to the DATABASE_MEMORY region and enables the following page sizes: AIX - large (16MB) pages, Linux x64 - huge (2MB) pages, and Windows - large (2MB) pages.- The DB:16GB setting is available on AIX only, which enables huge (16GB) pages for the DATABASE_MEMORY region.
We would like to configure 1GB pages on the Linux Guest System in order to match the VMWare Setting as other database vendors support it already. We expect a performance benefit by doing this.
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