Apache Reference: mod_mmap_static

mod_mmap_static - Caching of Frequently Served Pages via Memory Mapping
Since Apache 1.3, src/modules/experimental/mod_mmap_static.c
Dean Gaudet (1997)

Serving static pages from disk is the main task of a web server. The mod_mmap_static module maps a statically configured list of frequently requested (but not changed) documents into memory by using the UNIX mmap(2) function. Although this approach can dramatically reduce the response time and I/O consumption, it unfortunately brings nasty problems: every time a file changes, a reload of the server is required to remap the new contents into memory because mmap(2) doesn't allow automatic refreshments.

Directive:

MMapFile