[0x264]

Yep, another developer enthusiastically proposing mmap as an "easy win" for database design, when in reality it often causes hard-to-debug correctness and performance problems.

[nurettin]

To be fair, I use it to share financial time series between multiple processes and as long as there is a single writer it works well. Been in production since several years.

[pclmulqdq]

Creating a shared memory buffer by mapping it as a file is not the same as mapping files on disk. The latter has weird and subtle problems, whereas the former just works.