Crash with persistent version-based example during group construction

[Steamgjk]

I am studying the version-based example.
I refer to persistent_vector.cpp in the archive and modify simple_replicated_objects_json.cpp.
I use ramfs based on the discussion at #233, and
mount -t ramfs -o size=1000m ramfs /mnt/ram

for each of the three VM.

But after I launch node-0 and node-1, it throws errors

At the beginning, I thought it is because I did not copy the config and program to ramfs. However, even after I copied simple_replicated_objects_json and derecho.cfg to /mnt/ram there, it still throws the error.

I attach the cpp file and cfg files as below.
Archive.zip

Besides,
(1) If I want to use ramfs, how should I configure cfg files? (Question #234)
(2) If I want to use ramfs, do I have to copy the program and cfg to the ramfs folder and run there? Or can I just run in the previous location?

[songweijia]

There are several reasons for this issue:

1. Did you check the vm.overcommit_memory setting discussed here?
2. If 1) is true, I suspect the size of ramfs is too small. Could you try 4 - 8 GB instead?