LispOS

Robert Strandh's LispOS proposal [1] has a single-level object store as an alternative to a conventional file system. See especially [2] and [3] [1] https://github.com/robert-strandh/LispOS [2] https://github.com/robert-strandh/LispOS/blob/master/Documen... [3] https://github.com/robert-strandh/LispOS/blob/master/Documen...

Mostly dead projects: http://web.archive.org/web/20000418011820/http://www.hex.net... Some ideas: https://github.com/robert-strandh/LispOS

BBN Lisp and its successor Interlisp, popular in the 1960s and 70s, had a persistent data store that was more closely integrated with the running Lisp image than typical general-purpose file systems (slide 41 in [1]) The proposed (but apparently un-implemented) LispOS [2] was to have a single-level store where objects in the running Lisp image would be transparently checkpointed to disk, with no conventional file system. [1] http://www.international-lisp-conference.org/2005/media/bake... [2] https://github.com/robert-strandh/LispOS/blob/master/Documen..., also chap-checkpointing.tex

Several experimental systems have proposed replacing the traditional file system with what they call a "single level store": you have data structures in memory, then the OS saves them and restores them as needed from disk storage - but there are no traditional files on the disk, and the users don't interact with the disk storage at all - they just interact with the data while it is in memory. In this scheme, the disk storage is something like the pagefile in a conventional OS, but that's all there is - there are no conventional files. An interesting single-level store was discussed by Robert Strandh in his 2004 proposal for a Lisp operating system, Gracle. I can't find the original paper on the web anymore but some pertinent excerpts are in https://github.com/jon-jacky/Piety/blob/master/doc/gracle_ex.... Strandh referenced another expe