Osrm is in memory as well. We were serveing most of Europe and Asia from a box with 128 Gb RAM. It can use a mmaped file but it's too slow, even on a NVME drive

Osrm is in memory as well. We were serveing most of Europe and Asia from a box with 128 Gb RAM. It can use a mmaped file but it's too slow, even on a NVME drive. If you route anything more than 300 kms it will take a few seconds and then timeout.