lix/src/libstore/settings/sandbox-dev-shm-size.md

name, internalName, platforms, type, default

name	internalName	platforms	type	default
sandbox-dev-shm-size	sandboxShmSize	linux	std::string	50%

This option determines the maximum size of the tmpfs filesystem mounted on /dev/shm in Linux sandboxes. For the format, see the description of the size option of tmpfs in mount(8). The default is 50%.