Bug 44127

Bug: 44127

Impact:

Informational

Product:

GemStone/S 64 Bit

Versions:

3.7.1, 3.7, 3.6.8, 3.6.7, 3.6.6, 3.6.5, 3.6.4, 3.6.3, 3.6.2, 3.6.1, 3.6, 3.5.8, 3.5.7, 3.5.6, 3.5.5, 3.5.4, 3.5.3, 3.5.2, 3.5.1, 3.5, 3.4.5, 3.4.4, 3.4.3, 3.4.2, 3.4.1, 3.4, 3.3.9, 3.3.8, 3.3.7, 3.3.6, 3.3.5, 3.3.4, 3.3.3, 3.3.1, 3.3, 3.2.16, 3.2.15, 3.2.14, 3.2.13, 3.2.12, 3.2.11, 3.2.10, 3.2.9, 3.2.8.1, 3.2.8, 3.2.7, 3.2.6, 3.2.5, 3.2.4, 3.2.3, 3.2.2, 3.2.1, 3.2, 3.1.0.6, 3.1.0.5, 3.1.x, 3.0.1, 3.0, 3.0.X, 2.4.8, 2.4.7, 2.4.6, 2.4.5.1, 2.4.5, 2.4.4.8, 2.4.4.7, 2.4.4.6, 2.4.4.5, 2.4.4.4, 2.4.X, 2.3.1.6, 2.3.X, 2.2.6.5, 2.2.5.4, 2.2.x, earlier versions

Platform:

Linux

Fixed In:

3.2, 2.4.7

Shared Cache size limited to 256GB on Linux

Linux, by default, limits a single shared memory segment to 256GB.  This effectively limits the size of the shared page cache.

Workaround

Linux uses a memory page size of 4KB by default, but can be configured to use 2MB large memory pages.  Large pages will allow a larger shared page cache.  In v3.2 and later you can configure large pages on Linux by configuring the OS and using the configuration parameter SHR_PAGE_CACHE_LARGE_MEMORY_PAGE_POLICY.  For details, see the Installation Guide for the specific version, such as Installation Guide for v3.4 for Linux.

Large pages can also be configured in v2.4.7, using a slightly different procedure. See the Installation Guide for v2.4.7 for Linux for details.